HVAC School - For Techs, By Techs
In this short podcast episode, Bryan goes on another history journey, retelling the story of the rise and fall and rise of absorption cooling. Some of the first HVAC/R engineers cooled buildings with fire; they used absorption refrigeration, which ran on heat instead of electricity. In the early 1800s, French scientist Michael Faraday showed that gases like ammonia could absorb heat as they evaporated. Instead of compressing the vapor, engineers looked for a way to absorb the heat from the vapor and drive it back out. In 1859, Ferdinand Carré invented a machine that boiled ammonia,...
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In this comprehensive training session from the symposium, Tony Gonzalez, Training Director at Fieldpiece, delivers an engaging and practical guide to combustion analysis for HVAC technicians. With 25 years of experience at Fieldpiece—from warehouse worker to training director—Tony brings both technical expertise and real-world application to this 50-minute interactive session focused on the company's CAT 85 combustion analyzer. Tony emphasizes that combustion analysis serves four critical purposes: safety, efficiency, equipment specification verification, and liability protection. He...
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In this short podcast episode, we go back into the history of the trades, namely the battle over frequency (and how each side had to give until it hertz). The low hum of motors is alternating current: electricity moving back and forth through copper 60x per second (in the USA and Canada, at least). In another version of history, that pulse could be 50x per second instead (as in much of the remainder of the world). The forgotten frequency war is the lesser-known sequel to the war of the currents. Tesla's AC power prevailed over Edison's DC, but different motor and generator companies chose...
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In this candid conversation, Nathan and Bryan dive deep into the often-misunderstood world of sales in the construction and HVAC trades. Nathan, who has transitioned from fieldwork to spending roughly 60% of his time in sales, offers a unique perspective on why sales professionals are necessary despite the skepticism they face from tradespeople. The discussion tackles head-on the negative perceptions surrounding salespeople while making a compelling case for their essential role in growing and sustaining a trades business. The conversation explores the fundamental differences between...
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In this short podcast episode, Bryan takes us on a history journey back to when ammonia ruled the world. In the mid-1800s, before R-12, many inventors and scientists experimented with vapor-compression refrigeration systems to make ice. They used a variety of refrigerants in their patents, including ether, ethyl ether, carbon dioxide, sulfur dioxide, methyl chloride, and ammonia. Each one had tradeoffs, but ammonia was the favorite because it was inexpensive, very good at moving heat, and useful because its odor made leaks obvious (although it was toxic and irritated the lungs and mucus...
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In this episode of the HVAC School podcast, Bryan and Nathan dive deep into the challenges of humidity control in grocery stores and other refrigerated environments. While the conversation takes several entertaining detours (including discussions about morning radio shows, Indian weddings with elephants, and imaginary lava-heated homes), the core content provides valuable insights for HVAC and refrigeration technicians dealing with condensation and moisture issues in commercial refrigeration spaces. The hosts explain why humidity management is critical in grocery environments, where...
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In this short podcast episode, Bryan explores the history of the finned-tube coil, which is what we use for heat exchange in air-source air conditioners and heat pumps. Air-source HVAC systems have copper tubes threaded through thin metal fins. This design was optimized to ensure the greatest possible surface area for heat exchange to occur. However, prior to the finned-tube coil, HVAC coils looked more like plumbing projects with bare copper loops, which were heavy, costly, and inefficient. In the early 1900s, HVAC was essentially plumbing with higher expectations; capacity was dictated...
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In this comprehensive episode of the HVAC School podcast, host Bryan Orr sits down with three experts from Copeland to demystify tandem and trio compressor systems. Joining him are Gina Kahle (Multiples Engineering Manager with 12+ years at Copeland), Tyler Daniels (Product Management team member), and James Stevenson (Technical Sales veteran with 28 years of field experience). Together, they provide both the engineering perspective and real-world service insights that technicians need to understand these increasingly common systems. The conversation begins with the fundamentals: tandem and...
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In this short podcast episode, Bryan tells the story of the technology that tried to beat the compressor... and still may someday. We associate cooling with refrigerant... and all the things that come with it, including compressor noise, oil, recovery machines and tanks, leaks, superheat, and regulations. However, there is a means of providing cooling with two pieces of metal and several semiconductors; current runs through it, and one side becomes cold, and the other side becomes hot. This technology is called thermoelectric cooling, associated with the Peltier effect. In 1834, French...
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In this comprehensive episode, Bryan and Roman dive deep into one of the most challenging topics in modern HVAC: making VRF (Variable Refrigerant Flow) and ductless systems perform effectively in humid climates like Florida. The conversation tackles a common misconception that inverter-driven equipment automatically handles humidity well simply because it can "turn down." Roman emphasizes that successful application of VRF technology in humid environments requires skilled professionals who understand building science, envelope integrity, and proper system sizing. The biggest takeaway? If...
info_outlineIn this episode of the HVAC School podcast, Bryan Orr sits down with Bert and Leanna to discuss Kalos's first official cohort apprenticeship program, dubbed the "Launch Program." What started as Bryan's persistent idea—one that the team initially resisted as too expensive and logistically challenging—evolved into a transformative three-month training experience that brought 15 green apprentices through intensive classroom, lab, and field work across HVAC, electrical, and building automation systems.
Bert, who graded himself a B for his first attempt at leading the program, shares candid insights about the challenges of planning and execution. While he meticulously mapped out the first two weeks hour-by-hour, the remaining time was far less structured, leading to valuable lessons about the importance of ongoing planning and verification. Leanna, who came to Kalos with both teaching experience and a commercial HVAC background, brought crucial support that Bert initially didn't think he needed. Her contribution proved essential in managing the group of 15 and ensuring hands-on engagement. Of the original cohort, nine graduated, with two additional apprentices added later who showed exceptional promise.
The conversation reveals critical insights about what makes training effective in the trades. Both trainers emphasize the importance of hands-on experience over lecture, with Bert noting his biggest mistake was spending an entire day lecturing on refrigerant circuits before showing apprentices actual equipment. The most successful exercises involved real-world scenarios, like Leanna's mock dispatch day where apprentices handled service calls from start to finish, including customer communication. The program also incorporated broader trade skills beyond HVAC—carpentry, ladder safety, and tool confidence—recognizing that many young workers today lack the tactile experience that builds confidence in using tools and solving problems independently.
Perhaps most importantly, the discussion highlights the value of verification and confidence-building over knowledge dumping. Bert learned that making diagnostic exercises too complex early on destroyed apprentice confidence, while starting simple and building up created self-motivated learners. The cohort model's unique advantage lies in its competitive yet supportive environment, where apprentices can gauge their progress against peers who started at the same level, creating natural motivation to improve. While expensive and demanding, the program represents a long-term commitment to developing well-rounded tradespeople who can think critically and solve problems—not just perform repetitive tasks.
Topics Covered:
- The origins and initial resistance to implementing a cohort-style apprenticeship program
- Structuring a 90-day training program with classroom, lab, and field components
- The critical importance of planning and having adequate instructor support
- Selecting apprentices: key traits including self-motivation, adaptability, and humility
- Balancing lecture, hands-on training, and real-world field experience
- The power of verification and skills checklists over pure knowledge transfer
- Teaching broader trade skills (carpentry, ladder work) to build overall confidence
- Creating realistic scenarios like mock service calls for soft skills development
- Managing group size and the challenges of keeping all apprentices engaged
- The role of confidence-building in safety and long-term success
- Starting simple with diagnostic exercises and building complexity gradually
- Using field feedback and peer comparison as motivational tools
- The cost and commitment required to run effective cohort training programs
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