HVAC School - For Techs, By Techs

HVAC School is the ever growing online source for real training topics for technicians in the Air-conditioning, Heating and Ventilation Fields. In the podcast, we will share recorded training, tech ride alongs, share challenging diagnostic scenarios. All to help make the industry, your company, and your truck a better place to be.

Maintenance Mindset - Short #249 07/15/2025

Maintenance Mindset - Short #249 In this short podcast episode, Bryan explores the maintenance mindset. Maintenance procedures require a different skill set from troubleshooting, especially the customer service mindset and dedication to execution. Good maintenance is important, and it may be "boring" to some techs, but it provides value and is worth doing well. Clients purchase maintenance plans for better reliability and efficiency. Several also enjoy the health benefits of cleaner HVAC systems. The key to maintenance is having a "do no harm" mindset and a commitment to delivering value. A sales-oriented mindset should take a back seat to giving the equipment a thorough cleaning and making sure it's in proper working order; we don't want to upsell bolt-on IAQ products. Maintenance procedures are really about preventing problems and cleaning. To give the equipment a thorough cleaning, you must pull the top off the condenser and wash it well. You may have to pull a blower wheel (which may be a quotable procedure). Good maintenance techs take pride in these types of cleaning procedures and ensure that they leave the equipment in better condition than they found it. Problem prevention is another aspect of the maintenance mindset. When you're thorough, you find things that can be fixed or adjusted to benefit the system, whether it's a wire rubout, a failing crankcase heater, a poorly fitted filter with significant bypass, or something else. Spotting and addressing these issues early requires technical expertise (just like troubleshooting) and is of excellent value to the customer. Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/37148405

IAQ, Ethical Selling & Building Better Techs w/ Brynn Cooksey 07/10/2025

IAQ, Ethical Selling & Building Better Techs w/ Brynn Cooksey In this episode of the HVAC School podcast, Bryan welcomes back Brynn Cooksey from Air Doctors and HVAC U to discuss critical topics facing the HVAC industry today. Brynn brings his unique perspective as both a successful contractor in southeast Michigan and an industry educator who has made the transition to focusing primarily on workforce development and training. The conversation begins with a deep dive into indoor air quality (IAQ), where Brynn challenges the common industry approach of throwing products at problems without proper testing. He emphasizes that effective IAQ solutions start with comprehensive testing to identify specific issues like high particles, volatile organic compounds (VOCs), or excessive carbon dioxide levels. Rather than relying on "magic bullet" products, Brynn advocates for a holistic approach that prioritizes ventilation strategies, source control, and proper filtration. He particularly stresses the importance of the "V" in HVAC, ventilation, which he believes is often overlooked in favor of flashier solutions. His company's protocol of testing on every customer visit, from first encounters to maintenance calls, has created a culture where technicians become comfortable discussing IAQ solutions based on actual data rather than assumptions. The discussion transitions into ethical sales practices, a topic that resonates strongly in an industry where pressure to sell can sometimes conflict with customer needs. Brynn defines unethical sales as pressuring customers into products that won't benefit them or failing to provide complete information about benefits and consequences. His approach centers on thorough customer surveys to understand actual problems and budget constraints, followed by tying specific solutions to identified issues. This methodology puts the customer in control of decisions while positioning the contractor as a trusted advisor rather than a high-pressure salesperson. Brynn argues that price alone doesn't determine ethics - rather, it's the intent behind recommendations and the transparency of communication that matters most. The final segment focuses on workforce development, an area where Brynn has found significant success. His company's registered apprenticeship program, developed through the Department of Labor, has become a competitive advantage in attracting talent while providing structured, in-house training. The program requires minimal cost beyond commitment to ethical treatment of apprentices and systematic tracking of their progress. Brynn's transition from contractor to educator demonstrates the growing need for comprehensive training programs that go beyond basic technical skills to include building science, customer service, and ethical business practices. His ongoing weekly training sessions focus on field trends and callback prevention, contributing to an impressive callback rate of less than 0.5%. Topics Covered Indoor Air Quality Testing and Assessment Using monitors like Air Advice for comprehensive IAQ evaluation Implementing testing protocols on every customer interaction Moving beyond product-focused solutions to holistic approaches Ventilation Strategies and Building Science The importance of mechanical ventilation and ERV systems Understanding the relationship between building envelope leakage and humidity issues Source control as the foundation of effective IAQ management Ethical Sales Practices Defining unethical sales and pressure tactics Customer survey techniques and solution-tying methodologies The concept of fiduciary duty in HVAC contracting Equipment Sizing and System Design The impact of oversized equipment on IAQ and comfort Proper load calculations and duct system design Static pressure testing and airflow optimization Workforce Development and Training Implementing registered apprenticeship programs Weekly training sessions focused on field trends and callback prevention Transitioning from contractor to educator and industry trainer Building Envelope and Duct System Integrity Air sealing strategies for improved humidity control The relationship between leaky envelopes and indoor air quality Duct modifications and system upgrades Customer Education and Professional Positioning Using testing data to support recommendations Overcoming price objections through professional credibility Building long-term customer relationships through transparency Learn more about Brynn's work at . You can also read his article in Forbes at . Learn more about the GRIT Foundation at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/37200345

Crankcase Heaters - Short #248 07/08/2025

The Contactor Reimagined w/ Copeland 07/03/2025

The Contactor Reimagined w/ Copeland In this episode of the HVAC School podcast, Bryan welcomes back Jim to discuss the groundbreaking SureSwitch contactor technology from Copeland. This isn't just another incremental improvement - it's a complete reimagining of how contactors should work in modern HVAC systems. Jim brings his expertise and even demonstrates the technology with a special cutaway camera setup, giving listeners and viewers an inside look at this innovative solution. The conversation begins with the evolution of contactors in the HVAC industry, explaining how manufacturers moved backward from heavy-duty two-pole contactors to lighter, more cost-effective one-and-a-half pole designs. While this cost reduction made sense for manufacturers, it often left technicians dealing with more frequent failures and replacements. The SureSwitch represents a leap forward, combining the reliability of traditional heavy-duty contactors with modern electronic intelligence and enhanced protection features. One of the most compelling aspects of the SureSwitch is its multi-voltage coil capability, supporting 24V, 110V, and 240V applications with a single unit. This flexibility dramatically reduces inventory requirements for contractors and service companies, allowing one contactor to handle residential HVAC, refrigeration cases, ice machines, and pool heaters. The universal application makes it particularly valuable for smaller businesses that need to stock fewer SKUs while maintaining the ability to handle diverse applications. The technical innovation behind the SureSwitch's longevity is fascinating. Using an optical sensor (described as a "little eye" in the sealed chamber), the contactor monitors for electrical arcing during contact opening and closing. The built-in microprocessor analyzes the 60Hz AC sine wave and times the contact operation to occur at the zero-crossing point, eliminating destructive arcing. This "no-arc zone" operation, combined with latching contacts that prevent chatter during brownout conditions, results in contacts that remain clean and functional even after a million cycles - five times longer than traditional contactors. Key Topics Covered · Contactor Evolution and Industry Innovation o Historical perspective on contactor design changes from heavy-duty to cost-optimized o Why the HVAC industry needed to innovate forward rather than continue cost-cutting · Multi-Voltage Flexibility o Single contactor handles 24V, 110V, and 240V coil applications o Reduces inventory requirements and simplifies contractor operations o Applications include residential HVAC, refrigeration, ice machines, and pool heaters · Arc-Free Contact Technology o Optical sensor monitoring system for detecting electrical arcing o Microprocessor-controlled timing to operate at AC sine wave zero-crossing o Five times longer contact life compared to traditional contactors · Chatter Elimination and Latching Mechanism o Internal power supply eliminates dependency on weak control voltage o Magnetic latching system prevents contact bouncing during brownout conditions o Protection against undersized control wiring and long wire runs · Sealed Contact Chamber Design o 100% sealed contact chamber prevents insect and debris contamination o Eliminates common failure modes from ants, earwigs, and lizards o Reduces need for pest control interventions · Built-in Compressor Protection Features o Brownout protection with automatic voltage monitoring (184V threshold) o Random start delay (0-90 seconds) for multiple unit installations o Short cycle timer protection working independently of thermostat timers · Installation and Compatibility Considerations o Compatible mounting holes with standard contactors o Proper crankcase heater wiring configurations o Training considerations for technicians adapting to new terminal layout · Warranty and Business Applications o 10-year warranty vs. standard 1-year contactor warranties o Good-better-best selling scenarios for contractor businesses o Applications in high-end residential and commercial installations Learn more at the SureSwitch at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/37148610

Capacitor Testing and Replacement - Short #247 07/01/2025

Capacitor Testing and Replacement - Short #247 In this short podcast episode, Bryan goes through the process of testing and replacing a run capacitor. Run capacitors provide continuous phase-shifted current to the start winding, allowing the motor to run in the right direction and with the appropriate amount of torque. These capacitors are needed in most of the single-phase PSC motors we work with. Run capacitors are in the circuit all the time and are connected in series with the start winding (compared to start capacitors, which need to be taken out of the circuit after startup). They don't actually "boost" voltage. The bigger the capacitor, the more current can move in and out of the start winding. Run capacitors are made of foil and oil (and the manufacturing quality usually correlates to the capacitor's lifespan), and they usually fail due to overvoltage or overheating. Capacitors may also be replaced with one of a higher voltage rating but not a lower one. Before you test a capacitor, perform a visual inspection. Bloated tops and oil leakage are signs of failure. You'll also want to measure the microfarads and make sure it's within range. An under load test occurs while the system is running (and should NOT be done on blower capacitors for safety reasons). Bench testing happens while the system is off and the capacitor is disconnected and discharged. We have calculators for testing on our app. To test under load, measure the amperage on the start wire and multiply it by 2652. Then, divide that number by the voltage to find the capacitance in microfarads. If the capacitance is over 10% low, replace the capacitor. When replacing a capacitor, make sure the system is off, the capacitor is discharged, and that you tighten the strap and wire it up correctly. It's also a good idea to bench test the new capacitor. "Capacitor Testing and Replacement Procedure" tech tip: "What Is Up With Blower Amps & Watts w/ Steve Rogers" podcast: Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 7th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/37148095

Cold Coil vs. Desiccant Dehumidification 06/26/2025

Cold Coil vs. Desiccant Dehumidification In this comprehensive episode of the HVAC podcast, Bryan hosts an in-depth discussion about dehumidification technologies with two industry experts: David Schurk, National Sales Manager for Innovative Air Technologies, and Nikki Krueger from Santa Fe Products. The conversation explores the fundamental differences between compression refrigeration dehumidification and solid desiccant systems, providing valuable insights for HVAC professionals dealing with moisture control challenges. David Schurk brings 44 years of industry experience and serves as an ASHRAE Life Member and Distinguished Lecturer, teaching humidity control professional development courses. His expertise focuses on solid desiccant dehumidification systems for industrial and heavy commercial applications. Nikki represents Santa Fe Products, pioneers of whole-house ventilating dehumidification technology since the mid-1990s, and discusses the growing residential and light commercial market demands driven by tighter building construction and stricter energy efficiency requirements. The discussion delves into the critical importance of understanding dewpoint versus relative humidity measurements, a fundamental concept that often confuses technicians in the field. The experts explain how the dew point remains consistent throughout a space while relative humidity can vary dramatically based on temperature differences between rooms, floors, and ceilings. This understanding is crucial for proper system design, troubleshooting, and customer education, especially as homeowners become increasingly aware of indoor air quality concerns. The conversation also addresses the intersection of building science and dehumidification technology, emphasizing that proper moisture control requires both well-designed building envelopes and appropriate mechanical systems. From residential applications dealing with tighter construction and mechanical ventilation requirements to industrial processes like lithium battery manufacturing requiring extremely low humidity levels, the experts highlight how different technologies serve specific market segments while sometimes overlapping in commercial applications. Key Topics Covered Fundamentals of moisture control Compression refrigeration dehumidification Solid desiccant technology Market applications and demand drivers Building envelope importance Measurement and troubleshooting Water activity levels and mold prevention Technology boundaries Energy considerations Installation challenges Learn more about Santa Fe's products at , and learn more about David's work at . Both David Schurk and Nikki Krueger are active on LinkedIn, too. Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36772005

Learning Better - Short #246 06/24/2025

Learning Better - Short #246 In this short podcast episode, Bryan talks about learning styles and gives some tips for "learning better" and getting more out of continuing education opportunities. The first step to getting more out of educational opportunities is to know your learning style. There are three main styles: visual, kinesthetic (hands-on), and auditory. Most tradespeople will probably fall into the kinesthetic category, but not everybody is; you need to figure out if you're most comfortable working with your hands, listening to podcasts, watching videos, or reading. It's also a good idea to try the practical knowledge first and then study the theory. Most people can learn via all of these media, though, and preferences in learning styles aren't excuses not to seek knowledge via the other pathways. Some people also do better with different instructional styles. Instructors can be more or less structured and outgoing, and you may have a preference. Find instructors who explain concepts and conduct their classes or seminars in ways that you understand best. Teaching is also a great way to get a better understanding of a concept, as is incorporating hands-on opportunities and quizzes when you read, watch videos, or listen to podcasts. When you can teach and be taught in non-judgmental environments, you can get a lot more out of the learning experience. Comprehension comes before retention, so memorization is usually not going to be too helpful for HVAC education. Understanding should be the main focus, not memorizing facts or test answers, and that includes challenging your assumptions and finding hard problems to solve. You can also discover HVAC/R concepts in unexpected places, including scientific or lifestyle YouTube channels and podcasts. Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36770330

Intro to The Sigma Capacitor 06/19/2025

Intro to The Sigma Capacitor Sharon Goepferich from Cool Air Products joins the podcast to discuss cutting-edge capacitor technology and innovative HVAC solutions in an introduction to the Sigma capacitor. Sharon brings a decade of industry experience, having worked extensively with capacitors and HVAC components while traveling across the country to educate technicians and contractors. The conversation begins with a comprehensive breakdown of capacitor failures, addressing common misconceptions in the field. While manufacturing quality certainly plays a role in capacitor longevity, environmental factors like high temperatures and voltage disruptions—particularly common in markets like Florida with frequent lightning strikes—are primary contributors to failure. A crucial point emphasized is that failing capacitors typically cause compressor and motor failures, not the other way around. Many technicians incorrectly assume that a capacitor reading within tolerance is acceptable, but Bryan and Sharon clarify that even a degraded capacitor operating at reduced capacity can cause motors to run hotter and fail prematurely. This highlights the importance of proactive capacitor maintenance and replacement before complete failure occurs. The episode's centerpiece is the discussion of the innovative Sigma capacitor system, which Sharon describes as being "designed on an airplane over whiskey." This modular pod system addresses a longstanding challenge for HVAC technicians: the impossibility of stocking every capacitor size on their trucks. The Sigma capacitor uses a stackable approach where technicians build the exact capacitance they need in the field using standardized components. The system operates on a simple rule: build the higher values first (typically compressor capacitance on top), then stack the lower values (fan capacitance) underneath. This approach maximizes truck inventory efficiency while minimizing the number of SKUs contractors need to manage, representing a middle ground between carrying extensive individual capacitor inventory and using traditional universal capacitors. Cool Air Products extends beyond capacitors with their Combat P Trap system, an all-in-one condensate drain management solution that combines a shutoff valve, cleaning tab reservoir, and P-trap in a single unit. This product reflects the company's mission to solve everyday contractor problems in cost-effective ways. What makes Cool Air Products unique is their business model of helping industry insiders bring innovative ideas to market, providing support for patent processes, manufacturing connections, and funding. The Combat P Trap also demonstrates the company's commitment to giving back, as a portion of proceeds supports veterans—fitting since the product was designed by a veteran and serves an industry with significant veteran participation. Key Topics Covered Capacitor failure analysis Proper capacitor testing techniques Installation best practices Sigma capacitor system Inventory management strategies Combat P Trap system Distribution challenges Cool Air Products' business model Veteran support initiatives Future product developments Professional networking Learn more about Cool Air Products at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36770895

What's up with Refrigerant & System Regulations w/ Copeland 06/18/2025

What's up with Refrigerant & System Regulations w/ Copeland In this insightful episode of the HVAC School podcast, host Bryan sits down with Jennifer Butsch, Director of Regulatory Affairs at Copeland, to discuss the rapidly evolving regulatory environment affecting the HVAC industry. With eight years of experience at Copeland and a background spanning codes, standards, and regulatory affairs, Jennifer provides a unique perspective on the challenges and opportunities facing contractors, technicians, and manufacturers in today's market. The conversation begins with an in-depth look at the EPA's Technology Transition Rule and the recent shift from R-410A to mildly flammable refrigerants like R-454B and R-32 as of January 1, 2025. Unlike previous refrigerant transitions that allowed for years of overlap, this transition was compressed into a much shorter timeframe due to building code requirements for the new mildly flammable refrigerants. While equipment delivery has gone relatively smoothly, the industry has faced significant challenges with refrigerant availability, particularly R-454B service gas. Jennifer discusses how OEMs have responded creatively, including pre-charging units with additional refrigerant and providing recovery cylinders as short-term solutions. The discussion also covers the ongoing debate about potentially returning to R-410A, which Jennifer argues wouldn't solve the current cost and availability challenges. She emphasizes that manufacturers have already invested heavily in transitioning their production lines and that rolling back would actually increase costs and timeline complications while moving in the wrong direction environmentally. The conversation touches on energy efficiency standards and the limitations of what can be changed under current legislation, noting that rolling back to pre-2023 efficiency levels would require Congressional action to revise the Energy Policy and Conservation Act. Jennifer and Bryan explore the complex world of tariffs and their impact on pricing stability, the potential defunding of Energy Star and what privatization might mean for the industry, and the challenges of regulatory fragmentation when federal oversight decreases and individual states create their own rules. The episode concludes with Jennifer's perspective on Copeland's philosophy of industry stewardship and practical advice for contractors on how to make their voices heard through trade associations and direct communication with legislators. Topics Covered: Technology Transition Rule - EPA refrigerant phase-down from R-410A to 454B and R-32 Refrigerant Availability Challenges - Current shortages in 454B service gas and industry solutions Mildly Flammable Refrigerants - Building code requirements and safety considerations R-410A Rollback Discussion - Why returning to previous refrigerants isn't a viable solution Energy Efficiency Standards - Legal limitations on rolling back efficiency requirements Tariff Impact - Effects on pricing stability and manufacturing decisions Energy Star Program - Potential defunding and privatization concerns Regulatory Fragmentation - Challenges when states create individual rules vs. federal standards Industry Stewardship - Copeland's approach to leadership and collaboration Contractor Advocacy - How to effectively engage with trade associations and legislators Manufacturing Investment Challenges - Impact of policy uncertainty on long-term planning Transition Timeline Management - Lessons learned and recommendations for future regulatory changes Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/37027115

TXV Troubleshooting - Short #245 06/17/2025

Learning and Teaching GRIT w/ Ty Branaman 06/12/2025

Learning and Teaching GRIT w/ Ty Branaman In this episode of the HVAC School podcast, host Bryan Orr and guest Ty Branaman have an in-depth, hands-on conversation about the philosophy, structure, and impact of GRIT Camps—workshops designed to introduce kids to the trades through immersive, practical experiences. The episode opens with reflections on a recent successful GRIT Camp in New Jersey, where both mentors and children gained new skills and confidence. Ty shares the excitement of seeing young participants, many of whom had never shown interest in school before, become deeply engaged in building, problem-solving, and learning from trades professionals. Parents noticed a newfound enthusiasm in their children, while mentors were invigorated by the opportunity to share their expertise and even learn new techniques alongside the kids. A central theme is the use of the Socratic method—teaching through curiosity, guided questions, and hands-on experimentation. Rather than providing step-by-step instructions, mentors encourage kids to make mistakes, ask questions, and discover solutions on their own. This approach fosters deeper understanding, builds confidence, and develops critical thinking skills. Bryan and Ty discuss the importance of meeting each learner where they are, allowing for individualized progress and ensuring that every participant, regardless of prior experience, leaves with a sense of accomplishment. The hosts also highlight how this method benefits mentors, many of whom find themselves learning and growing alongside the kids. GRIT Camps are designed like an “escape room” or adventure challenge. Each module—carpentry, electrical work, brazing, and more—presents real-world problems for kids to solve, emphasizing both safety and creativity. The hands-on activities are intentionally open-ended, allowing for flexibility and adaptation by different mentors and hosts. Safety is a recurring focus, with detailed discussions about best practices for working with tools, protective equipment, and managing risk, especially when introducing children to potentially hazardous tasks. The conversation also explores the broader societal impact of GRIT Camps, emphasizing the importance of restoring respect for hands-on skills and empowering both kids and mentors to build, fix, and create with confidence. Topics Covered in This Episode: The origins and goals of GRIT Camps The Socratic method: fostering curiosity, problem-solving, and hands-on learning Structuring camps as adventure challenges to boost engagement and creativity Safety protocols and best practices for working with tools and materials Teaching modules: carpentry, electrical work, brazing, and more Customization and creativity: allowing kids to personalize their projects The importance of respecting and restoring hands-on skills in society Encouraging contractors and communities to replicate and expand the GRIT Camp model The impact on kids, parents, and mentors—building confidence, skills, and community Reflections on neurodiversity, learning styles, and the value of practical education Learn more about the GRIT Foundation at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36763405

Band-Aids, Hacks, and Ethics - Short #244 06/10/2025

Why VRF Compressors Die w/ Roman 06/05/2025

Why VRF Compressors Die w/ Roman In this episode, Bryan and Roman dive deep into the world of Variable Refrigerant Flow (VRF) systems, focusing on the persistent issue of compressor failures. VRF technology has evolved, and it has seen a major rise in the North American market since the early 2010s. Roman shares his passion for VRF, tracing its origins back to 1982 and explaining how it earned the nickname “chiller killer” by replacing traditional chiller systems in large facilities like hotels, churches, and schools. However, with this rapid adoption came a troubling reputation: VRF systems became notorious for frequent compressor failures, prompting some institutions to revert to older technologies. There are three primary causes of compressor failure in VRF systems: oil lubrication issues, liquid refrigerant return, and electrical failures. VRF compressors are shipped with excess oil to account for the system’s extensive piping and multiple indoor units, but improper refrigerant charge—either overcharging or undercharging—can disrupt oil return and lead to gradual compressor death. They emphasize the importance of correct installation, accurate charge calculation, and diligent maintenance. Bryan adds that measuring discharge superheat is a key diagnostic tool: high discharge superheat with normal suction superheat signals poor lubrication and impending failure. The discussion then shifts to the dangers of liquid refrigerant returning to the compressor. Even small amounts can wash oil off the scroll plates, leading to metal-on-metal contact, galling, and eventual mechanical breakdown. Roman details the difference between high-pressure shell and low-pressure shell compressors, noting that VRF systems are more susceptible to operational flood back, which can cause elevated amp draws and catastrophic failure. They also highlight the role of contamination—such as copper shavings or sand from installation—which can damage expansion valves and lead to chronic flood back issues. Maintenance, including regular oil analysis and monitoring of expansion valve performance, is crucial for long-term reliability. Finally, the episode covers electrical failures, often the result of underlying mechanical issues rather than true electrical faults. The hosts advocate for using insulation resistance testing (megohmmeters) as a maintenance tool to track winding degradation over time. They stress that proper cleanup after a compressor failure is vital, recommending temporary filter dryers and oil analysis to mitigate contamination. The conversation closes with practical advice: always investigate the root cause of a compressor failure, communicate findings with clients, and prioritize best practices in installation and service to prevent repeat issues. Topics Covered in This Episode: The history and rise of VRF technology in North America Why VRF systems earned the nickname “chiller killer” The three primary causes of VRF compressor failure: Oil lubrication issues (overcharge/undercharge, oil return) Liquid refrigerant return (flood back, expansion valve failures) Electrical failures (mechanical causes, insulation degradation) Diagnostic techniques: discharge superheat, suction superheat, amp draw analysis The impact of installation practices and system contamination Maintenance best practices: oil analysis, filter dryers, insulation resistance testing The importance of root cause analysis after compressor failures Resources for ongoing VRF education: , , and Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36759885

No Serve Situations - Short #243 06/03/2025

No Serve Situations - Short #243 In this short podcast episode, Bryan talks about some no-serve situations he's encountered as a technician and HVAC business owner. He also talks about situations that may be unpleasant but aren't quite no-serve situations. Some common and obvious no-serve situations are when a client threatens a technician, especially with lawsuits, bad reviews, or even bodily harm. However, some clients are just naturally defensive, so we want to be careful and give people a chance if they're angry and might just need to calm down. Unrealistic expectations can also cause no-serve situations. Some complaints are tricky to deal with but can be solved, but other problems are impossible to solve. We have every right not to serve clients who have problems that don't have realistic solutions (such as wanting a thermostat that doesn't make a clicking noise at all). In those cases, Kalos usually gives some degree of a refund and agrees not to do business with the customer again. Dirtiness of the living space can also be a no-serve situation. Unless a home is dangerously filthy (e.g., it can cause a respiratory disease) or the equipment is not accessible, we can serve them. Even if the home is filthy or the equipment is inaccessible, we can ask the owner to clean up and return to serve them. On the other side of the coin, hypochondriacs can be a challenge to deal with, but no-serve situations are rare; we can take precautions, including more thorough testing and hold-harmless agreements. Other no-serve situations are people who don't pay, people who regularly pay extremely late, customers who aren't the owner (such as tenants or family members), and clients who try to drag you into drama with other contractors. Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36746240

Locked Compressor Mistakes w/ Bert 05/29/2025

Locked Compressor Mistakes w/ Bert In this informative HVAC podcast episode, Bryan and Bert dive deep into the complex world of locked and internal overload compressors, focusing specifically on single-phase residential units. The discussion begins with Bert explaining one of the most common challenges technicians face: diagnosing a locked compressor. He describes how compressors that are locked will typically run for only a second before overheating and stopping, creating a cycle that can be difficult to detect if technicians aren't carefully monitoring at the right moment. The hosts share personal experiences and practical diagnostic techniques, with Bert recounting how he once simulated a locked compressor by cutting the start winding wire and concealing it beneath other wires and zip ties. This demonstration highlights the importance of thorough inspection, including checking terminal connections. Bryan shares a story from his early career when he mistakenly condemned a compressor with damaged terminals, not knowing about terminal repair kits - a candid moment that illustrates how even experienced technicians continue to learn throughout their careers. A significant portion of the podcast is dedicated to explaining the electrical fundamentals of compressor operation, including an enlightening discussion about start windings, run windings, and common connections. Bryan passionately clarifies misconceptions about current flow through these different windings, explaining that the start winding actually has consistently lower amperage due to its connection through a capacitor. The hosts also detail the critical differences between a compressor that's overheating versus one that's truly locked, emphasizing that the physical temperature of the compressor often provides the key diagnostic clue. Key Topics Covered: · How to identify a locked compressor versus one that's out on internal overload · The importance of checking terminal connections and wire continuity · Why compressors that are truly locked don't have time to physically overheat · Common causes of compressor overheating: condenser fan failure, refrigerant issues, airflow problems · The proper diagnostic method for catching a locked compressor "in the act" · The mechanics of start windings versus run windings and their amperage differences · When and how to use hard start kits appropriately (and why they shouldn't be used universally) · How to communicate with customers when diagnosing compressor issues · The role of crankcase heaters in preventing flooded starts · Terminal repair techniques and when they're appropriate Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36548110

When 0V Isn't Safe - Short #242 05/27/2025

Compressor Ohm Mistakes w/ Bert 05/22/2025

Compressor Ohm Mistakes w/ Bert In this episode, Bryan and Bert dive into the often misunderstood world of compressor testing, focusing on common mistakes technicians make when using ohmmeters, compressor testers, and megohm meters. The conversation highlights how diagnostic errors can lead to unnecessarily condemned compressors and wasted time and resources. The hosts begin by discussing fundamental concepts like the difference between "open" and "short" conditions, emphasizing that a path doesn't necessarily indicate a short circuit—it simply means there's a low-resistance path. They explore how many technicians get confused when testing terminals, mistakenly thinking that normal winding-to-winding measurements indicate a problem. Through practical examples from their field experience, they illustrate why understanding normal readings is crucial before taking any measurement. A significant portion of the discussion centers on proper testing techniques for scroll compressors, which often show different measurements to ground compared to other compressor types due to their design, with windings submerged in refrigerant and oil. Bryan and Bert explain why standard motor testers can lead to false diagnoses when they indicate "bad" at threshold levels like 20 megohms—a reading that would be normal for many functional scroll compressors. They recommend proper megohm meters calibrated to appropriate voltage levels for accurate testing. Key Topics Covered: The difference between "open" circuits and "shorts" and how to properly interpret ohm readings Common mistakes when testing compressor terminals, especially misinterpreting normal winding-to-winding measurements How to properly check for shorts to ground and the importance of clean connections Why scroll compressors naturally show different resistance-to-ground readings due to their design with submerged windings Problems with inexpensive compressor testers that give false "bad" readings on functional equipment The "redneck test" for isolating a compressor to determine if it's truly the source of breaker trips The importance of understanding meter auto-ranging and correctly interpreting readings in ohms, kilohms, and megohms Why a reading below 0.5 megohms to ground is the general threshold for concern with scroll compressors Differences between megohm meters, high pot testers, and standard multimeters The misconception that winding-to-winding shorts are common without corresponding shorts to ground Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36278470

Motor Ambient Rating - Short #241 05/20/2025

Superheat Talk w/ JD Kelly 05/15/2025

Superheat Talk w/ JD Kelly In this episode of the HVAC School podcast, host Bryan discusses superheat with guest JD, who recently co-authored an article on the topic with Ty Branaman. The conversation explores the often misunderstood concept of superheat, its importance in HVAC diagnostics, and common misconceptions technicians have when measuring and interpreting it. Bryan begins by sharing how superheat was initially taught to technicians in the late 1990s and early 2000s, primarily as a method for charging fixed metering device systems. He explains how this limited view led to problems, as technicians would often add or remove refrigerant based solely on superheat readings without considering other system factors or giving the system time to stabilize. JD points out how the industry shifted when TXVs (Thermostatic Expansion Valves) became standard, with many technicians abandoning superheat measurements altogether in favor of subcooling measurements, missing crucial diagnostic information in the process. The discussion then evolves into a more sophisticated understanding of superheat as an indicator of evaporator coil "fullness." Bryan explains that lower superheat indicates a fuller evaporator coil, while higher superheat suggests a starved coil. They discuss the importance of measuring superheat in the correct location, noting that TXVs control superheat at the evaporator outlet, not at the condensing unit where technicians often measure. This misunderstanding leads to many incorrect diagnoses of "bad TXVs" when the real issues might be related to airflow, heat pickup in line sets, or other factors. Both experts emphasize the value of measuring superheat both inside at the evaporator outlet and outside at the condensing unit to get a complete picture of system operation. Key Topics Covered: Definition of superheat and its importance in HVAC diagnostics How superheat indicates evaporator coil "fullness" (flooded vs. starved conditions) The distinction between charging by superheat and using superheat as a diagnostic tool Common misconceptions about superheat measurement on TXV systems Why measuring superheat location matters (evaporator outlet vs. condensing unit) How to properly diagnose TXV issues using superheat measurements The relationship between airflow problems and superheat readings Normal superheat ranges for residential systems (7-14 degrees at evaporator outlet) How superheat affects both system capacity and compressor safety "Exercising" TXVs as a troubleshooting technique How line set conditions and installation factors can impact superheat readings System behavior during "hot pull down" conditions when starting with high indoor temperatures JD and Ty's superheat tech tip and worksheet: Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36268985

How to Deal w/ Too Much - Short #240 05/13/2025

Delta T Talk w/ JD Kelly 05/08/2025

Delta T Talk w/ JD Kelly Bryan from HVAC School interviews JD Kelly, known as "student of HVAC" on Instagram, about Delta T measurements in HVAC systems. This episode dives into the fundamentals of Delta T, common misconceptions, and proper measurement techniques. JD explains that Delta T is simply a temperature difference between two points of the same medium, which is often misunderstood in the industry. Many technicians are taught to measure between return grills and supply registers, but this approach can lead to inaccurate readings due to external factors like duct leakage or heat gain from attics. The proper measurement should be taken directly at the equipment to evaluate how the evaporator coil is performing. Humidity plays a significant role in Delta T measurements, which JD discovered when researching the fundamentals. Bryan elaborates on this point, explaining that in high-humidity environments (like Florida), more energy goes toward removing moisture (latent heat) rather than cooling the air (sensible heat), resulting in lower Delta T readings. This is why a newly repaired unit in a humid house might initially show lower readings but improve as the home dries out. The discussion highlights why the common "20-degree Delta T" rule of thumb isn't universally applicable and requires context. Key Topics Covered: Definition of Delta T: Temperature difference between two points of the same medium Difference between Delta T and TD (temperature difference) Proper probe placement for accurate Delta T readings Impact of humidity on Delta T measurements How regional differences affect expected Delta T values Relationship between CFM (airflow) per ton and Delta T readings Common mistakes: Adjusting equipment based solely on Delta T readings Challenges of applying Delta T in heat pump heating mode How temperature dead spots can affect readings Why Delta T readings must be considered alongside other diagnostic tests The danger of making unnecessary adjustments to HVAC systems Why high Delta T isn't always good and low Delta T isn't always bad JD's Delta T tech tip: Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36264060

Fire Sprinklers - Short #239 05/06/2025

The PATH to High Performance HVAC w/ David Richardson 05/01/2025

The PATH to High Performance HVAC w/ David Richardson In this engaging session, David Richardson breaks down the concept of high-performance HVAC, offering a clear roadmap for industry professionals looking to elevate their craft. Richardson argues that the HVAC industry has long been focused on equipment rather than complete systems, leading to widespread inefficiencies. The average system delivers only about 57% of its rated capacity into buildings, while even code-approved systems barely reach 63%. By implementing high-performance HVAC principles, contractors can achieve up to 88% efficiency while improving safety, health, comfort, and energy performance. Richardson presents a practical framework using the acronym "PATH" - Pressure, Airflow, Temperature, and Heat (BTUs) - as a step-by-step approach to implementing high-performance HVAC. He emphasizes starting with static pressure testing, which he calls "the foundation of airflow" and one of the most misunderstood principles in the industry. Just as doctors check blood pressure as a vital sign during every visit, Richardson advocates for measuring static pressure on every call, or at minimum, when encountering "red flag" issues like repeated equipment failures. From there, professionals can progress to measuring airflow, temperature, and finally BTU delivery to create complete system diagnostics. The presentation offers a journey-based approach, acknowledging that implementation takes time and requires breaking old habits. Richardson introduces the "one degree principle," suggesting that change happens incrementally, with small improvements eventually leading to breakthrough moments. He urges contractors to apply this methodology not just to equipment, but to extend testing into duct systems and even the building envelope. By making these changes visible through measurement, contractors can prove value to themselves, their teams, and ultimately their customers, transforming the way HVAC work is perceived and delivered. Key Topics Covered: The definition of high-performance HVAC: getting back to craftsmanship, challenging the status quo, and confirming work through measurement The industry problem: focusing on equipment instead of complete systems, resulting in just 57% of rated BTU capacity reaching conditioned spaces The PATH framework: Pressure, Airflow, Temperature, and Heat as building blocks for system diagnostics How to implement static pressure testing as the foundation for airflow diagnostics The importance of measuring at both equipment and register/grille locations Breaking down implementation into three areas: equipment, ducts, and building envelope STEPS approach: Show, Teach, Equip, Promote, with application to yourself, your team, and your customers The "one degree principle" for making incremental changes that lead to breakthrough results Common obstacles to implementation and how to overcome resistance to change How measurements make your work transparent and lead to better performance Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36263405

Estimating Tips and Software 04/30/2025

Estimating Tips and Software In this episode of the HVAC School Podcast, host Bryan sits down with Phil, the executive electrical team leader at Kalos who has transitioned into the world of estimating. Phil shares his extensive background in electrical work dating back to 1994, from his high school electrical elective to running his own business for eight years before joining Kalos and eventually establishing their estimation department. The conversation delves deep into the fundamentals of estimating in the trades, contrasting traditional qualitative approaches with more rigorous quantitative methods. Phil emphasizes that good estimating is about "finding the truth" - understanding the actual costs of materials and labor for a project. They discuss how traditional estimating often relies on heuristics and past experiences with similar jobs, while more detailed estimating involves comprehensive takeoffs and assembly-based counting. The pair explores how estimation isn't just about producing a final number but should provide valuable information that transfers to the production phase. A highlight of the episode is Phil's introduction of his self-developed estimating software called Unity Build. He explains how his interest in AI technologies led him to learn programming and eventually create this cloud-based solution that integrates AI assistance while maintaining the fundamental tools needed for thorough estimating. The software allows for collaboration between team members, is entirely browser-based, requiring no downloads, and is priced at $125 per month per seat. Bryan emphasizes that this is Phil's own business venture that he's taken an interest in, and they both stress that potential users should buy it for what it currently offers, not future promises, though they are committed to continuous improvement. Topics Covered: Phil's 30+ year journey in electrical work and how he learned estimating The difference between qualitative (heuristic-based) and quantitative (detailed takeoff) estimating approaches Unit pricing vs. assembly-based takeoffs in estimating How good estimating transfers value to the production phase The workflow of detailed estimating from information gathering to closeout Labor factoring and how it affects cost calculations Phil's development of Unity Build estimation software using AI integration Cloud-based advantages of the new software, including collaboration capabilities How Unity Build facilitates handoff from estimating to production Pricing model ($125/month per seat) and target customers (small to mid-sized contractors) The importance of estimating honesty and finding the "truth" in project costs Check out Unity Build Estimation at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/36357730

Nylog, Oil? Where does it go? - Short #238 04/29/2025

Growing your HVAC Business the Smart Way w/ Copeland 04/24/2025

Growing your HVAC Business the Smart Way w/ Copeland In this episode of the HVAC School podcast, Bryan and Jim discuss strategies for growing an HVAC business, focusing on the importance of maintenance contracts, consistent service, and effective branding. Drawing from Jim's 15 years of experience running a successful HVAC company in California, they explore how maintenance contracts not only provide consistent revenue but also create valuable training opportunities for technicians. The conversation emphasizes that maintenance contracts are fundamental to building company value. Jim shares that when he sold his business, the number of maintenance contracts was a key valuation metric. These contracts tie customers to your company, provide consistent work during shoulder seasons, and offer technicians crucial repetitive practice with equipment. Bryan adds that maintenance provides technicians with opportunities to observe normal equipment operation repeatedly, which builds troubleshooting skills through pattern recognition. Both hosts stress the importance of consistency in growing a business. They note that large, successful HVAC companies aren't always the most technically excellent, but they deliver consistent service that customers can rely on. Jim introduces the marketing concept of "TOMA" (Top Of Mind Awareness), sharing how he used branded coffee bags as thank-you gifts to keep his company in customers' minds even after service calls were completed. The discussion concludes with an examination of White Rogers' contractor branding program, which allows HVAC companies to put their name and logo on thermostats, creating another touchpoint for customer awareness. Key topics covered: How maintenance contracts increase company valuation and create customer loyalty Using maintenance as a training ground for developing technician skills The importance of consistent processes and documentation when scaling a business Creating "Top Of Mind Awareness" (TOMA) with customers through strategic touchpoints White Rogers' contractor branding program for thermostats Benefits of Sensi thermostats and their app features, including multiple temperature sensors Different pricing strategies for customers with and without maintenance contracts The importance of documenting extended warranty information on invoices How service departments can weather economic downturns better than installation-focused businesses Get contractor branding on your Sensi thermostats today at . Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/35959310

Oversized Evap Coils? - Short #237 04/22/2025

Oversized Evap Coils? - Short #237 In this short podcast episode, Bryan answers a listener-submitted question about oversized evaporator coils, particularly when they're half a ton or a full ton larger than the condenser. The expanded performance data contains the information that'll tell you whether the coil is right for the system. However, when it comes to the specific issue of oversizing, there is a common misconception that coil size affects the saturated suction temperature. The truth is that they're not related; you could fully insulate different-sized coils and move the same amount of refrigerant, but they will behave similarly. The saturated suction temperature (suction pressure, evap temperature) is driven by the heat entering the system. Coils are designed to handle refrigerant flow rates and airflows, so having a lower airflow over a large coil allows for greater cooling due to the bigger surface area, lower bypass factor, and dwell time. When more heat enters the evaporator coil, the saturated suction temperature increases, but some of that heat enters as latent heat and helps with dehumidification. However, a larger coil also takes longer to get colder, and the superheat settings become more important. You have to be careful with lower face velocities across the evaporator coil, as laminar flow isn't as good at transferring heat as turbulent flow. That is one of the limitations of using a larger coil with lower airflow. If the expanded performance data has a rated match for a larger coil, then that same data will also contain information about the required airflow. Testing in and testing out is also important. Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/35808785

ERVs - What you need to know w/ Dr. Bailes 04/17/2025

ERVs - What you need to know w/ Dr. Bailes In this episode of the HVAC School podcast, host Bryan sits down with building science expert Allison Bailes to dive deep into the world of Energy Recovery Ventilators (ERVs). The conversation explores the critical role of ventilation in modern homes, highlighting how ERVs have become an essential component of maintaining indoor air quality and energy efficiency. Bailes breaks down the technical nuances of ERVs, explaining how these systems not only bring fresh air into a home but do so while recovering both temperature and moisture energy. The discussion goes beyond simply explaining what an ERV is, delving into the practical considerations of ventilation strategies. Bailes shares personal experiences, including challenges he faced with over-ventilation in his own home, which led to extremely dry indoor conditions. The podcast explores the complex balance of bringing outdoor air inside while managing humidity, temperature, and air quality. Listeners gain insights into why simply bringing in outdoor air isn't always the best solution, especially in climates with extreme humidity or air quality challenges. Throughout the episode, Bailes and Bryan emphasize the importance of thoughtful ventilation design. They discuss the evolution of home construction, noting how increasingly airtight buildings have made proper ventilation more crucial than ever. The conversation touches on key considerations for selecting and implementing ERVs, including motor efficiency, boost capabilities, filtration, and the impact of outdoor air conditions. The experts provide practical advice for contractors, technicians, and homeowners looking to improve their understanding of indoor air management. Key Topics Covered: The difference between Energy Recovery Ventilators (ERVs) and Heat Recovery Ventilators (HRVs) Moisture transfer and vapor permeability in ventilation systems Balanced ventilation strategies and their importance Challenges of over-ventilation and indoor air quality Filtration considerations for ERV systems Impacts of outdoor air quality on home ventilation Strategies for different climate zones The role of ERVs in managing indoor humidity and temperature Resources Mentioned: Allison Bailes' book: "A House Needs to Breathe... Or Does It?" Upcoming online ventilation course from Energy Vanguard (expected May 2025) Energy Vanguard website: Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/35891560

Multiple Surge Protectors - Short #236 04/15/2025

The Cornerstones of Inverter Equipment Commissioning 04/10/2025

The Cornerstones of Inverter Equipment Commissioning In this podcast episode, HVAC professionals Chris Hughes and Adam Mufich discuss the intricate challenges technicians face when commissioning modern inverter-based heating and cooling systems. Unlike traditional single-stage or two-stage HVAC equipment, inverter systems introduce a new level of complexity that can leave even experienced technicians feeling uncertain about proper installation and startup procedures. The presentation highlights a fundamental shift in how HVAC systems operate, moving from straightforward single-stage systems to sophisticated inverter-based technologies that modulate compressor, fan, and refrigerant flow dynamically. This technological evolution creates significant challenges for technicians, who previously could rely on simple, consistent commissioning processes. The speakers emphasize that modern inverter systems require a much more nuanced approach, with specific temperature ranges, wait times, and verification methods that are not always clearly documented in manufacturer manuals. Recognizing the industry-wide need for clarity, Chris and Adam have developed a comprehensive spreadsheet resource that consolidates commissioning information across multiple HVAC brands. Their goal is to empower technicians by providing accessible, standardized guidance for working with these complex systems. By sharing their research and encouraging collaboration, they aim to address what they see as a critical gap in manufacturer support and technical documentation. The podcast serves as both an educational resource and a call to action for HVAC professionals and manufacturers alike. Chris and Adam argue that the industry needs more transparency, better documentation, and a collective effort to standardize inverter system commissioning practices. Their work represents a significant step towards demystifying these advanced HVAC technologies and ensuring that technicians can confidently and effectively install and service modern heating and cooling equipment. Key Topics Covered: Differences between single-stage, two-stage, and inverter HVAC systems Commissioning challenges with modern inverter technologies Critical factors in proper system startup, including: Outdoor and indoor temperature requirements Wait times for system stabilization Refrigerant charging methods Airflow measurement and verification The importance of precise refrigerant charging (superheat and subcooling) Challenges with manufacturer documentation and technical support The need for standardized commissioning procedures across HVAC brands Strategies for verifying system performance during commissioning The speakers' collaborative effort to create a comprehensive inverter system commissioning guide Have a question that you want us to answer on the podcast? Submit your questions at . Purchase your tickets or learn more about the 6th Annual HVACR Training Symposium at . Subscribe to our podcast on your or . Subscribe to our channel. Check out our handy here or on the HVAC School Mobile App for and /episode/index/show/hvacschool/id/35876565

HVAC School - For Techs, By Techs

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