Building HVAC Science
Building HVAC Science covers a broad array of topics in building science and HVAC diagnostics, as well as human comfort, health, and safety. Hosted by HVAC measurement and building performance experts Eric Kaiser & Bill Spohn, this show will take a deep dive into all things that relate to buildings and people in the built environment. This show is a production of TruTech Tools, LTD.
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EP224 Beyond Vapor Compression: Smarter DOAS with Liquid Desiccants with Phil Farese (June 2025)
06/27/2025
EP224 Beyond Vapor Compression: Smarter DOAS with Liquid Desiccants with Phil Farese (June 2025)
In this in-depth episode of Building HVAC Science, hosts Bill Spohn and Eric Kaiser sit down with Phil Farese, CEO of Mojave HVAC, to explore the cutting edge of desiccant dehumidification technology. Phil, whose career began in physics at Cornell and research at Princeton before moving into consulting at McKinsey and leadership roles at NREL, Enphase, and now Mojave, brings a rare mix of scientific rigor and market savvy to the HVAC space. The conversation traces the evolution of liquid desiccant systems and Mojave’s unique approach that combines vapor compression and liquid desiccant in a single DOAS (Dedicated Outdoor Air System) unit. The result? Enhanced dehumidification, reduced energy use, and precision control of sensible and latent loads—at market-competitive prices. Phil outlines how Mojave’s patented media bed and regeneration systems avoid many of the pitfalls that plagued earlier desiccant systems, while also maintaining ease of installation, low maintenance, and strong reliability. Listeners also hear about Mojave’s service philosophy, tech training programs, and broad rep network, plus a discussion of ideal use cases, efficiency standards like ISMRE (Integrated Seasonal Moisture Removal Efficiency), and how the system outperforms traditional DOAS units. Whether you’re an engineer, contractor, or building owner looking to optimize HVAC performance while cutting energy bills, this episode delivers clear, science-backed insight into where dehumidification is headed. Quotes from the episode: “We’re not undoing cooling with reheat—we’re using that energy to do something useful: regenerate the desiccant.” “Liquid desiccants are like the honey of HVAC—safe, natural, and surprisingly powerful.” “It looks like an air conditioner. That’s what contractors tell us—and that’s the point.” Phil’s LinkedIn: Mojave Energy Systems: Tony Mormino, our friend at HVAC-TV did a recent interview with Mojave: Eutectic system defined: AHRI Standard 920,Performance Rating of Direct Expansion-dedicated Outdoor Air System Units: Papers and reports by Phil: Tool to Prioritize Energy Efficiency Investments (NREL 2012): How to build a low-energy future (2012): ASHRAE paper on Liquid Desiccants: McKinsey paper:Unlocking Energy Efficiency in the US Economy (2009): This episode was recorded in June 2025.
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EP223 AI Without the Hype: Real-World Automation with Tersh Blissett (June 2025)
06/20/2025
EP223 AI Without the Hype: Real-World Automation with Tersh Blissett (June 2025)
In this high-energy episode of Building HVAC Science, Bill Spohn and Eric Kaiser welcome Tersh Blissett—entrepreneur, podcaster, and automation enthusiast—for a deep dive into how AI and automation are transforming service businesses. Tersh, known for running multiple HVAC, plumbing, and electrical companies, shares his journey from podcasting beginnings to becoming a Zapier expert and automation evangelist. He explains how AI voice tools, custom GPTs, and platforms like Notebook LM and PhoneTap are helping streamline operations, improve call conversions, and create more consistent customer experiences. The conversation explores both the promise and the pitfalls of AI, from building SOPs and staff training bots to setting up Slack-integrated employee handbooks. Tersh doesn’t shy away from the challenges—like automating broken processes or managing security risks—but encourages listeners not to ignore these powerful tools. He wraps up by offering guidance and community resources for those looking to start their AI journey, reinforcing the message: don't automate for automation’s sake—do it to solve real problems. Quotes from today’s episode: “If you do something more than three times a week, optimize it, automate it, or delegate it.” “Don’t automate just to automate—solve a problem first.” “Authentic human tone is going to win, even if AI is writing it.” Tersh’s LinkedIn: Trade Automation Pros: Tersh’s email: / Tersh’s Podcast: Other links mentioned in today’s episode: Capture computer based learning/processes (look for the Automation Foundation) (always recording pendant) Understand anything Claude by Anthropic This episode was recorded in June 2025.
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EP222 Airflow, Action, and Ideas: Brent Davidson’s Mission to Elevate Heat Pump Pros (June 2025)
06/13/2025
EP222 Airflow, Action, and Ideas: Brent Davidson’s Mission to Elevate Heat Pump Pros (June 2025)
In this episode of Building HVAC Science, Bill Spohn and Eric Kaiser welcome back Brent Davidson, founder of the U.S. Heat Pump Summit, for an energizing discussion that soars from glider flights to the frontlines of heat pump education and adoption. Brent shares the story behind launching the Summit—from a hunch inspired by his solar-industry background to a growing movement that now brings together top contractors, technical experts, manufacturers, and rebate program leaders. The goal? To improve both the business and field deployment of air and water-based heat pump solutions. Brent outlines what sets the Summit apart: a laser focus on real-world, immediately actionable knowledge, a casual and collaborative vibe, and a mission to unify high-performance trades around the electrification of homes. This year’s event, happening November 18–19 at the DCU Center in Worcester, MA, will feature expanded tracks, a full trade show floor, and a speaker lineup packed with industry leaders. The conversation closes with a nerdy deep dive into the “coffin corner” of aviation physics—showcasing Brent’s curious mind and setting the tone for the Summit itself: smart, focused, and driven to elevate the industry. The first podcast Brent came on: US Heat Pump Summit: Brent’s LinkedIn: Brent’s email: This episode was recorded in June 2025.
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EP221 Consultative Selling Meets Smart Software in Home Performance with Amanda Godward (May 2025)
06/06/2025
EP221 Consultative Selling Meets Smart Software in Home Performance with Amanda Godward (May 2025)
“Proposals don’t save energy… action does.” — Bill Spohn “I didn’t know how cool this thing was until we started sharing it with the world.” — Amanda Godward “Change is hard—but that’s what makes it great.” — Amanda quoting Ross Trethewey from This Old House In this episode of Building HVAC Science, hosts Bill Spohn and Eric Kaiser welcome Amanda Godward, founder of Ecotelligent Homes and Ecotelligent Software. Amanda shares her journey from mechanical engineer in the auto industry to a passionate home performance contractor and software developer. Her Excel-based audit tool, born from a need to streamline customer reports and drive action, eventually evolved into a full-blown mobile and desktop app that’s now saving contractors hours per appointment. Ecotelligence Software is designed by a contractor for contractors. It supports fast, accurate energy audits and work orders, including customizable good-better-best proposals, automated workflows, and rich documentation via mobile-friendly tools. Amanda highlights how her engineering background helped her embed best practices, consistency, and compliance into the platform, resulting in better customer outcomes and more efficient field operations. From audit to install, Amanda’s thoughtful approach and personal joy in helping others shines through. The conversation underscores the value of consultative selling, real-time proposals, and how the right tool can empower contractors to fix more homes faster—all while delighting customers and installation crews alike. Amanda is offering discount code: BSHVAC to get half off your first month of service with Ecotelligent, this code expires June 30, 2025. Ecotelligent software: Amanda’s LinkedIn: Amanda’s email: Amanda’s home performance business: This episode was recorded in May 2025.
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EP220 Just Keep Learning: The HVAC Journey of Dirk Nauman (May 2025)
05/30/2025
EP220 Just Keep Learning: The HVAC Journey of Dirk Nauman (May 2025)
“The process doesn’t fail. The technician fails to follow the process.” – Dirk Nauman In this inspiring episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn are joined by Dirk Nauman—HVAC trainer, simulator inventor, and founder of Visual 3D Academy. Dirk shares his personal transformation from a nervous first-time trainer to an industry innovator dedicated to improving HVAC education through simulation and visualization. He discusses how necessity drove him to create his first HVAC simulator from scrap components, eventually evolving it into a line of compact training tools now used in schools, prisons, and technical programs across North America. Dirk also introduces the Visual 3D Academy platform, a 3D-based learning system designed to immerse students in HVAC theory like never before. From diagnosing faults to exploring animated equipment cutaways, learners can access both physical simulators and virtual models. He emphasizes the importance of foundational understanding and how his mission includes supporting returning citizens and changing lives through education. This episode is packed with insights on building training tools from scratch, applying theory in meaningful ways, and using technology to close the skills gap in HVAC. Whether you’re a contractor, educator, or technician, Dirk’s story will energize your approach to learning—and teaching—the trade. Dirk’’s LinkedIn: Visual 3D Academy website: HVAC Simulator Website: Dirk’s Technician vs. Mechanic video: Dirk’s email address: The book he mentions (By Daniel W. Bixby): Product Training for the Technical Expert: This episode was recorded in May 2025.
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EP219 Thermentor: Rethinking Load Calcs with Real Energy Data with Max Reichlin (May 2025)
05/23/2025
EP219 Thermentor: Rethinking Load Calcs with Real Energy Data with Max Reichlin (May 2025)
“We’re not guessing what’s inside the walls—we’re measuring how homes really use energy.” Max Reichlin In this episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn sit down with Max Reichlin from Clean Power Research to explore a groundbreaking HVAC tool: Thermentor. Designed to bridge the gap between estimated and actual residential energy loads, Thermentor leverages real energy usage data to perform virtual energy audits. The goal? More accurate, faster, and accessible load calculations that empower contractors and homeowners alike—particularly when considering heat pumps, dual fuel systems, or just right-sizing equipment. Max shares the origin story of Thermentor, explains how the tool works, and discusses its current deployment across a handful of U.S. states, with more to come. He also outlines future plans, including better integration with real-time thermostat data and improved incentive visibility. Listeners will gain insight into how traditional Manual J calculations may overshoot actual needs, and why tools like Thermentor could reshape how we approach home comfort and efficiency. Whether you're an HVAC pro or a curious homeowner, this episode delivers valuable context on where HVAC technology is headed—and how data-driven tools are making that future a little smarter. Max’s LinkedIn: Thermentor website: Thermentor White Papers: This episode was recorded in May 2025.
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EP218 Breaking Down Silos: The Path to Better Retrofit Training with Ben Hildebrandt (May 2025)
05/16/2025
EP218 Breaking Down Silos: The Path to Better Retrofit Training with Ben Hildebrandt (May 2025)
In this episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn welcome Ben Hildebrandt, a passionate advocate for building science and green technology education at the Southern Alberta Institute of Technology (SAIT). Ben shares his winding career path—from automotive mechanics to aircraft maintenance to architectural technology—and how that journey has shaped his deep commitment to sustainable building practices. Ben discusses the role of applied research at SAIT, highlighting its focus on real-world implementation of green technologies in residential and commercial buildings. He covers the challenges of deep energy retrofits, labor shortages, and siloed efforts within the industry, and offers insights into training programs aimed at bridging those gaps. The conversation also explores comfort, thermal resilience, and the importance of integrating mechanical systems with building envelopes to avoid costly failures. Whether you’re a contractor, designer, educator, or just curious about the future of high-performance buildings, this episode delivers a comprehensive look at what’s working—and what still needs work—in the green building movement. Some great quotes from the episode: You can’t have a green building if you ignore building science—it’s the foundation for comfort, health, and durability." "The real challenge isn’t technology—it’s training enough people to use it right." "We don’t need more silos in this industry. We need bridges." Ben’s LinkedIn: Residential Deep Energy Retrofit Guide (Free PDF Download): SAIT Applied Research and Innovation Services Hub: Retrofit Canada (some great completed Canadian Retrofit Case studies here): This episode was recorded in May 2025.
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EP217 Where Building Science Meets HVAC: Insights from New Orleans (April 2025)
05/08/2025
EP217 Where Building Science Meets HVAC: Insights from New Orleans (April 2025)
In this episode of Building HVAC Science, Eric Kaiser and Bill Spohn are joined by a special guest who’s carrying on the Spohn legacy—Billy Spohn. The trio recaps their experience at the 2025 National Home Performance Conference in New Orleans, the largest in the event’s history, with over 2,800 attendees. They reflect on the continued convergence of HVAC and building performance disciplines, and how this cross-pollination is finally taking root at scale. From highlights in the expo hall, including interest in the new RetroTec Air Tracer and the Testo 860i thermal imager, to insightful sessions on whole-home solutions and ventilation maintenance, the conversation underscores the critical value of collaboration and continuing education. Bill shares a touching moment from his “Faces of Energy Efficiency” interview, revealing how this conference shaped his path and even inspired the founding of TruTech Tools. The episode closes with admiration for industry legends like John Tooley and rising influencers like Genry Garcia, who exemplify the power of blending theory, tools, and field application. Whether you're a veteran or a first-time attendee, this recap will inspire you to think holistically about comfort, health, and energy use in buildings—and maybe even join the community at the next show in Columbus, OH, in 2026. The next NHPC in 2026: Our lineup of Building Performance and HVAC tools: LinkedIn: This episode was recorded in April 2025.
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EP216 Built to Last: How JB Industries Keeps It Made in America (April 2025)
05/02/2025
EP216 Built to Last: How JB Industries Keeps It Made in America (April 2025)
In this episode of Building HVAC Science, hosts Bill Spohn and Eric Kaiser sit down with Jeff Cherif and David Madden from JB Industries, a long-standing, U.S.-based HVAC tool manufacturer with deep roots in Aurora, Illinois. Jeff shares his fascinating journey from Motorola executive in Dubai to co-owner of JB Industries, sparked by a chance rooftop encounter with one of JB’s own vacuum pumps in the Middle East. David brings a multi-generational connection to the business and reflects on the evolution of JB’s manufacturing ethos and engineering depth. The conversation dives into what sets JB apart: a true commitment to American manufacturing, ultra-durable tool designs, and a strong feedback loop with HVAC contractors. The team shares stories behind new product development, including their latest line of wireless probes and a replaceable-sensor micron gauge. They emphasize quality, repairability, and a willingness to collaborate directly with field pros who have fresh ideas. It’s a heartfelt and detailed look at a company staying grounded in principles while pushing innovation forward. Link to JB’s website: Link to JB’s product line: Link to the JB Product Ideas form: JB ClimateClass Wireless probes: Jeff’s LinkedIn: Dave’s LinkedIn: This episode was recorded in April 2025.
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EP215 Mindset, Metrics & Mastery: Anthony Woo’s HVAC Game Plan (March 2025)
04/25/2025
EP215 Mindset, Metrics & Mastery: Anthony Woo’s HVAC Game Plan (March 2025)
“How much pain they have cost us, the evils which never happened.” —Thomas Jefferson In this episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn sit down with Anthony Woo, an HVAC contractor from Quebec, Canada. Anthony shares his journey from dropping out of college to becoming a successful business owner specializing in heat pump installations in one of North America's coldest climates. He discusses his personal and professional evolution, from gaining confidence through a Tony Robbins seminar to implementing systems like EOS in his rapidly growing business. Anthony also highlights the power of data-driven decisions, the importance of networking through NCI, and his passion for educating homeowners about indoor air quality and comfort. Throughout the conversation, Anthony gives us a peek into his strategic approach to business growth, emphasizing sustainable scaling, reinvesting in his team, and leveraging modern tools like the TrueFlow Grid for diagnostics. He also talks about creating a strong personal brand and reputation that fueled his success primarily through word-of-mouth marketing. This episode offers actionable insights for HVAC professionals looking to elevate their craft, implement smart business practices, and lead with purpose. Some thought nuggets from Anthony: “Podcasts are like a university on wheels for learning.” “As I learn new things, I’m conscious of making sure my colleagues have the framework to understand what I am talking about.” “I apply filtration to ideas to decide what to implement.” Finally, Anthony offers a simple yet powerful piece of advice: set your goals, make a plan, and go after what you want—without fear. After we finished recording, ELK helped summarize: “You’ve said you don't know how to run a business. What you are really saying is you are not running a business the way others do or advise you to do, you are running your business on your own terms.” Anthony’s LinkedIn Profile: YouTube: Facebook: Instagram: This episode was recorded in March 2025.
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EP214 Why Small HVAC Companies Get Stuck—and How WorkHero Helps Them Grow with Furman Haynes (March 2025)
04/18/2025
EP214 Why Small HVAC Companies Get Stuck—and How WorkHero Helps Them Grow with Furman Haynes (March 2025)
“You can be high quality and effective, but also efficient at the same time.” — Furman Haynes, Founder of WorkHero In this episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn sit down with Furman Haynes, co-founder of WorkHero, to explore a critical challenge facing small HVAC business owners: the administrative burden that stifles growth. Furman shares his journey into the HVAC industry, inspired by a passion for building organizations that support small business success. He recounts his eye-opening experiences at industry events and his realization that paperwork and administrative tasks often overwhelm small operators. Furman explains how WorkHero was designed to provide expert office management for companies with under ten employees—helping them streamline operations without adding complex software. Through a combination of dedicated virtual office managers and AI-powered tools, WorkHero tackles the paperwork bottlenecks that can prevent growth. Furman also discusses insights from their recent industry survey, revealing that small businesses spend over 15 hours a week on admin work and often get stuck at the $1-2 million revenue mark without making strategic investments in people or systems. The conversation wraps up with Furman’s take on the importance of mindset shifts for owner-operators, the role of data in improving pricing strategies, and the need for a supportive community like to ensure quality-focused businesses can remain profitable and thrive. Furman’s LinkedIn: His email: Work Hero Website: Link to the Survey Results: There are many reports out there, but none of them look specifically at the day-to-day realities of running your own small business. That's why WorkHero partnered with to survey over 1,300 industry professionals. This Industry Pulse report examines: The state of the industry - from company sizes to revenue patterns How contractors balance technical work with business operations Why owners often hit a growth ceiling around $1-2M in revenue Which tools and technologies companies are adopting What successful companies are doing differently Drawing from real data across the country, we provide insights about managing growth, freeing up owner time, and dealing with the technician shortage. The findings reveal both challenges and opportunities for contractors of all sizes. This episode was recorded in March 2025.
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EP213 Revolutionizing HVAC: How Pearl Edison Bridges Homeowners and Contractors with Jake Yurek (February 2025)
04/11/2025
EP213 Revolutionizing HVAC: How Pearl Edison Bridges Homeowners and Contractors with Jake Yurek (February 2025)
In this episode of the Building HVAC Science Podcast, Bill Spohn and Eric Kaiser interview Jake Yurek, the co-founder of Pearl Edison, a platform designed to simplify the installation of energy-efficient systems for homeowners and contractors. Jake shares the origins of the company’s name, inspired by Thomas Edison’s first power station on Pearl Street, and explains how Pearl Edison partners with trusted entities like utilities and city governments to facilitate HVAC installations. Their approach aims to reduce customer acquisition costs for contractors while improving the decision-making process for homeowners. Jake delves into the unique value proposition of Pearl Edison: acting as an intermediary that guides homeowners to the right system design before involving contractors. This approach saves contractors time and increases profitability by ensuring they engage with highly qualified leads. Pearl Edison focuses on maintaining high-quality standards by utilizing BPI-certified experts for home assessments, conducting blower door tests, and leveraging robust data analytics to provide personalized system recommendations. The conversation also explores Pearl Edison’s business model of partnering with utilities and local governments, its strategic expansion plans, and the commitment to building trust and comfort with homeowners. Jake highlights the company’s continuous messaging and technology evolution to serve contractors and enterprise partners better. He invites interested contractors to connect with Pearl Edison, emphasizing the potential for mutually beneficial partnerships as the company grows into new markets. Learn more at: Jake’s LinkedIn: This episode was recorded in February 2025.
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EP212 Home Comfort Demystified: A Deep Dive with Eric George (February 2025)
04/04/2025
EP212 Home Comfort Demystified: A Deep Dive with Eric George (February 2025)
In this episode of Building HVAC Science, Bill Spohn and Eric Kaiser sit down with Eric George, founder of Home Comfort Advisor, to discuss his journey from insulation and energy audits to content creation and education. Eric shares how his background in home performance shaped his passion for providing homeowners and tradespeople with reliable, science-based information. He details his soon-to-launch online course, which simplifies building science principles for homeowners and professionals alike, helping them ask the right questions and make informed decisions about home comfort, insulation, and energy efficiency. Eric also dives into the importance of proper diagnostics, virtual inspections, and the role of high-quality content in debunking myths and misinformation in the industry. Eric's insights and resources provide a fresh, practical approach to improving indoor environments if you’re a contractor, homeowner, or just someone interested in the science behind home comfort. Tune in to learn more about his course, YouTube channel, and how he’s making building science accessible to all. Eric’s LinkedIn: Learn Home Comfort Resources: His YouTube channel: His course: This episode was recorded in February 2025.
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EP211 Data Integrity in HVAC: Why It Matters More Than You Think with Rachel Kaiser (February 2025)
03/28/2025
EP211 Data Integrity in HVAC: Why It Matters More Than You Think with Rachel Kaiser (February 2025)
In this episode of Building HVAC Science, Bill and Eric welcome Rachel Kaiser to discuss an often-overlooked yet critical topic: data integrity in HVAC and building performance. Rachel, who has a background in scientific research and data quality, shares insights into how the HVAC industry generates and manages data, why data integrity matters, and the risks of poor data management. They explore real-world examples—from technicians misreporting measurements to the challenges of maintaining reliable combustion data—and discuss how digital tools can both help and hinder data integrity. Rachel breaks down key principles of data integrity using the ALCOA+ framework, which ensures data is attributable, legible, contemporaneous, original, and accurate, along with being complete, consistent, enduring, and available. The conversation touches on how connected tools, data logging, and digital advancements are reshaping HVAC, making accurate data more accessible while also increasing the need for awareness and best practices. If you've ever questioned how reliable your measurements are—or how much you can trust the data you work with—this episode is a must-listen! Rachel on LinkedIn: This episode was recorded in February 2025.
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EP210 Building Better: Why HVAC and Construction Must Work Together with Sophie Ashley (February 2025)
03/21/2025
EP210 Building Better: Why HVAC and Construction Must Work Together with Sophie Ashley (February 2025)
In this episode of Building HVAC Science, hosts Bill Spohn and Eric Kaiser welcome Sophie Ashley of Energy Vanguard, an HVAC designer with a background in carpentry and building science. Sophie shares her journey from hands-on construction work to HVAC design, emphasizing the critical integration of mechanical systems and building structures. She discusses the importance of feedback loops with installers and her experience performing HERS ratings in the field. Sophie also highlights the shift toward high-performance homes, the growing adoption of heat pumps, and the evolving role of ventilation strategies like ERVs. She provides insights on overcoming industry challenges, the need for better collaboration between trades, and the importance of attracting more women to the field. Wrapping up, she encourages continuous learning and engagement in the HVAC community, emphasizing the rewarding nature of the industry. Energy Vanguard website: Sophie on LinkedIn: This episode was recorded in February 2025.
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EP209 From Safety to Sustainability: Navigating the A2L Revolution with Keith Gifford (January 2025)
03/14/2025
EP209 From Safety to Sustainability: Navigating the A2L Revolution with Keith Gifford (January 2025)
In this episode of the Building HVAC Science podcast, host Eric Kaiser is joined by Keith Gifford, Senior Global Product Manager at Penn Controls, for an in-depth discussion about the emerging use of A2L refrigerants in the HVACR industry. A2Ls are a new class of refrigerants classified by ASHRAE as mildly flammable and boast a significantly lower global warming potential (GWP) compared to traditional refrigerants. Keith shares his unique perspective, shaped by extensive experience across all major refrigeration components, to explain the challenges, opportunities, and safety considerations surrounding A2Ls. Key topics include the design and engineering hurdles posed by A2Ls, such as material compatibility, flammability mitigation, and the development of leak sensors calibrated to specific refrigerants. Keith also addresses the impact on service technicians, building codes, and system designs, emphasizing the importance of industry-wide education to ensure safe and effective adoption. Finally, Keith reflects on the future of refrigerants, including the potential for CO2 and other environmentally friendly solutions, signaling that innovation in HVACR is far from over. PENN Controls: AHRI A2L Building Code map: SNAP Rule 26: ASHRAE New Refrigerant Safety Designations and Classifications: Keith on LinkedIn: This episode was recorded in January 2025.
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EP208 Tools, Tech & Community: AHR Expo & HVAC Symposium Debrief with the Team from TruTech (February 2025)
03/07/2025
EP208 Tools, Tech & Community: AHR Expo & HVAC Symposium Debrief with the Team from TruTech (February 2025)
In this episode of Building HVAC Science, Bill Spohn and Eric Kaiser, along with the TruTech Tools team, recap their experiences at the 6th Annual HVACR Training Symposium and AHR Expo in Orlando, Florida. They share insights from meeting industry professionals, attending educational sessions, and exploring the latest HVAC tools and technology. The team discusses key highlights, including the impact of Second Chance University, the HVAC Tactical Awards, and the High-Performance Hangout, emphasizing the strong sense of community within the industry. The team also dives into standout products showcased at AHR, such as Testo’s new thermal imaging cameras, Inficon’s D-TEK Pro leak detector, and NAVAC’s latest digital manifold. They touch on the increasing role of technology in HVAC, including EEV Mate’s electronic expansion valve tool and advancements in vacuum pumps and refrigerant scales. Finally, they reflect on the growing educational initiatives in HVAC, such as the Grit Foundation’s efforts to introduce young people to the trades and the launch of Better HVAC, a nonprofit that fosters ethical practices and knowledge-sharing. Whether you attended the events or missed out, this episode provides an engaging recap of what’s shaping the HVAC industry in 2024. Tune in to hear firsthand experiences and takeaways from some of the most significant gatherings in the field! Two things we missed: The Third US HeatPumpSummit is on tap for this November in Massachusetts. Our friends at ran a survey in conjunction with the to look at the day-to-day realities of running a small HVAC business. See the survey results here: Sue on LinkedIn: Josh on LinkedIn: Bill, Jr. on LinkedIn: Eric on LinkedIn: Bill, Sr. on LinkedIn: 2nd Chance University: HVAC Tactical: The NCI Summit: This episode was recorded in February 2025.
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EP207 Craig Migliaccio on Bridging Theory and Practice in HVAC Education (January 2025)
02/28/2025
EP207 Craig Migliaccio on Bridging Theory and Practice in HVAC Education (January 2025)
In this episode of Building HVAC Science, Eric Kaiser and Bill Spohn welcome Craig Migliaccio, the creator of AC Service Tech, author, educator, and industry influencer. Craig shares his journey from teaching HVAC in high school to becoming a prolific author and content creator, driven by a passion for making practical, hands-on learning accessible to HVAC professionals and students. With over 60,000 copies sold of his first book and a rapidly growing suite of resources, Craig has made an indelible mark on the industry. Craig discusses the challenges and rewards of writing technical books, the value of bridging the gap between theory and practice, and the immense effort involved in producing educational materials. His team-driven approach and dedication to quality are evident in his books, training tools, and YouTube channel, which boasts over 500,000 subscribers. Craig also emphasizes the importance of work-life balance, family, and faith, encouraging listeners to prioritize their well-being alongside their professional goals. Craig’s motivation to write came from gaps he observed in existing HVAC textbooks, leading him to create step-by-step, procedure-focused resources. Building a robust educational platform requires collaboration, persistence, and a willingness to iterate and improve. Craig’s advice to technicians: prioritize family, invest in knowledge and skills, and focus on meaningful connections in the industry. Craig’s YouTube Channel: Craig’s books at TruTech Tools: And his newest book can be found here: His website: EP 74 with Craig from 2022: Craig on LinkedIn: This episode was recorded in January 2025.
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EP206 Mastering Indoor Air Quality: John Ellis’ 6 Key Principles with John Ellis (January 2025)
02/21/2025
EP206 Mastering Indoor Air Quality: John Ellis’ 6 Key Principles with John Ellis (January 2025)
In this insightful episode of the Building HVAC Science Podcast, host Eric Kaiser takes a deep dive into the world of indoor air quality (IAQ) with guest expert John Ellis. With over four decades of experience in HVAC and building science, John shares his wisdom on addressing IAQ challenges effectively. The discussion spans the critical importance of tailoring solutions to individual client needs, the tools and methodologies for assessing indoor air environments, and the interplay between building science and mechanical systems in achieving optimal outcomes. John introduces his six key principles for good IAQ, covering everything from thermal comfort and filtration to pollutant control and building pressure management. The conversation also highlights real-world applications, including helping clients with severe medical conditions improve their quality of life through better IAQ strategies. Whether you're an HVAC technician or a building performance professional, this episode is packed with actionable insights and practical advice to elevate your IAQ solutions. John’s number 505-652-8119 LinkedIn: Facebook: Dynamic Air Consulting on Facebook: HVAC Learning Campus: This episode was recorded in January 2025.
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EP205 Building Integrity in the Trades: A Canadian Contractor’s Journey with Manly Arnason (January 2025)
02/14/2025
EP205 Building Integrity in the Trades: A Canadian Contractor’s Journey with Manly Arnason (January 2025)
In this heartfelt episode of the Building HVAC Science Podcast, Eric Kaiser and Bill Spohn welcome Manly Arnason, an HVAC business owner from Brandon, Manitoba, Canada. Manly shares his journey of transformation—from a challenging past to becoming a dedicated tradesperson with a mission to bring integrity and quality to the HVAC industry. Drawing from his experiences running a small business, Manly opens up about the challenges of implementing proper practices in the trades, the importance of continuous education, and the role of community in fostering growth and excellence. Manly’s story highlights the power of personal and professional change, emphasizing his commitment to commissioning systems properly, adhering to codes, and treating customers with the respect they deserve. The conversation touches on the unique challenges of working in the Canadian climate, the significance of national apprenticeship programs, and the value of building a like-minded community to support others striving to improve their craft. This inspiring episode is a reminder that growth, both personal and professional, begins with a decision to do better. His business website: His business on Facebook: Manly’s email: This episode was recorded in January 2025.
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EP204 Seitron Americas: Innovating HVAC Tools and Training with Jason Esteves and Dan Kelly (January 2025)
02/07/2025
EP204 Seitron Americas: Innovating HVAC Tools and Training with Jason Esteves and Dan Kelly (January 2025)
In this engaging episode of the Building HVAC Science Podcast, hosts Eric Kaiser and Bill Spohn welcome Jason Esteves and Dan Kelly from Seitron Americas. The discussion offers an in-depth look at Seitron’s evolution, its role in the HVAC industry, and the company's dedication to training and customer support. Jason and Dan share their personal journeys, recounting how they started in the industry, their mentorship under the late Ray Biarnes, and their passion for delivering high-quality products and service. The conversation highlights Seitron’s live-fire training academy, the launch of new products like the BeSafe portable gas monitors and combustion analyzers, and their upcoming refrigeration tools debuting at AHR Expo. The guests emphasize the company's focus on customer feedback, innovation, and a family-oriented culture. Personal anecdotes, such as Jason’s son competing in the Little League World Series and their mutual connection to their soccer coach turned mentor, add a relatable and heartfelt dimension to the episode. This episode is a must-listen for HVAC professionals eager to learn more about Seitron’s commitment to supporting technicians, innovating in the field, and fostering a sense of community in the industry. Find Seitron at Booth 5391 at the AHR expo Seitron’s homepage: Seitron Products at TruTech Tools: Jason’s contact info: Dan’s contact info: [email protected] This episode was recorded in January 2025.
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EP203 Why Energy Isn't the Problem: Exploring Thermal Comfort and IEQ with Robert Bean (January 2025)
01/31/2025
EP203 Why Energy Isn't the Problem: Exploring Thermal Comfort and IEQ with Robert Bean (January 2025)
In this engaging episode of the Building HVAC Science Podcast, host Eric Kaiser is joined by Robert Bean, an ASHRAE Distinguished Lecturer and a renowned expert on indoor environmental quality (IEQ). Together, they explore the intricate relationship between architecture, thermal comfort, and HVAC systems. Robert shares insights from his extensive travels, observations of traditional architecture, and key lessons from his work in designing high-performance buildings. The discussion highlights the critical distinction between energy efficiency and human comfort, emphasizing that discomfort often drives energy use. Robert explains foundational concepts like mean radiant temperature (MRT) and operative temperature and how they profoundly affect perceived comfort. He challenges common industry assumptions, such as relying solely on air temperature for thermal comfort, and advocates for a comprehensive approach that includes radiant, convective, and architectural solutions. Listeners will gain practical advice on incorporating IEQ principles into design, leveraging tools like the ASHRAE Standard 55 and Robert’s free eBook, Thermal Comfort Principles and Practical Applications for Residential Buildings. The conversation concludes with a call to prioritize human comfort in every aspect of building design and operation. Get the free eBook mentioned here: Here is Robert’s LinkedIn profile: Center for Built Environments Thermal Comfort Tool: Robert joined us in 2017 for episode #4: This episode was recorded in January 2025.
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EP202 Unlocking High-Performance HVAC: Insights with David Richardson (January 2025)
01/24/2025
EP202 Unlocking High-Performance HVAC: Insights with David Richardson (January 2025)
In this episode of the Building HVAC Science Podcast, Eric Kaiser welcomes David Richardson from the National Comfort Institute. David shares his journey from starting as a “gopher” for his father’s HVAC business to becoming a leading advocate and instructor for high-performance HVAC systems. The discussion delves into the evolution of HVAC standards, focusing on the importance of measurements, diagnostics, and craftsmanship in delivering comfort, safety, and energy efficiency. David introduces the concept of high-performance HVAC, emphasizing the importance of field measurements to diagnose and solve system inefficiencies. The conversation highlights tools like the TrueFlow® Grid, which have revolutionized testing accuracy and streamlined processes. They also touch on customer engagement, the challenges of breaking industry habits, and the importance of a growth mindset when adopting new practices. The episode concludes with David encouraging HVAC professionals to embrace small, consistent improvements, measure system performance on their own projects, and engage with the growing community of like-minded industry peers who are eager to share knowledge. Here is David’s LinkedIn profile: NCI’s HOMEPAGE: NCI Store on TruTech website: Find the Digital TrueFlow® Grid at TruTechTools®: This episode was recorded in January 2025.
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EP201 Evolving HVAC Strategies: Solving Problems for People, Not Just Homes (December 2024)
01/17/2025
EP201 Evolving HVAC Strategies: Solving Problems for People, Not Just Homes (December 2024)
In this insightful episode of Building HVAC Science, co-hosts Bill Spohn and Eric Kaiser reconnect with Silas Hoeppner for a follow-up discussion that dives deeper into optimizing comfort and efficiency in existing homes. Silas shares his journey of transitioning from a house-centric approach to an occupant-centric model in his work, detailing the lessons he’s learned and how these shifts have reshaped his philosophy. You can find more details on Silas’ backstory in Episode 193, found here: Silas explains the importance of understanding homeowners’ unique goals and success metrics rather than imposing a one-size-fits-all solution. Through his experiences, he emphasizes the value of asking the right questions, effectively addressing comfort issues, and avoiding assumptions about efficiency or customer priorities. Silas also explores the nuances of balancing technical precision with customer communication, highlighting real-life examples of problem-solving that reflect this paradigm shift. The conversation touches on common misconceptions, such as the oversizing of heat pumps and misplaced priorities in energy audits. Silas concludes by offering actionable advice for listeners: prioritize clear communication, understand the occupants’ real needs, and ensure solutions align with both immediate and long-term goals. Here is his LinkedIn profile: This episode was recorded in December 2024.
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EP200: 200 Episodes Strong: Reflecting on the Building HVAC Science Journey with Bryan Orr (December 2024)
01/10/2025
EP200: 200 Episodes Strong: Reflecting on the Building HVAC Science Journey with Bryan Orr (December 2024)
In this milestone episode, Bill Spohn and co-host Eric Kaiser welcome Bryan Orr, the instigat-ORR behind the creation of the Building HVAC Science podcast. They dive deep into the podcast's origin story, reflecting on how Bryan's love for audio and creative expression sparked a wave of content that has deeply impacted the HVAC industry. Bryan shares his journey from audio experimentation as a child to podcasting professionally, highlighting the values of curiosity, passion, and the abundance mindset in both personal and professional life. Bill and Bryan discuss how podcasting has shaped their careers and relationships, emphasizing the joy of connecting with people, sharing knowledge, and leaving a legacy. Bryan lauds Bill’s warm, engaging voice and thoughtful approach to podcasting, while Bill credits Bryan for mentoring him into the space. They share insights into the challenges and rewards of consistent content creation and how the show has evolved to explore topics that truly inspire them. Looking forward, Bill envisions a gradual transition, with Eric taking on more of the driving role while Bill continues as a passionate participant. The episode concludes with a plug for the HVACR Training Symposium, an event Bryan leads to connect industry professionals and advance the field. HVACR SCHOOL WEBSITE (Chock full of resources!): HVAC School Podcast: 6th Annual Symposium: This episode was recorded in December 2024.
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EP199 Rebuilding Lives: The Mission of Second Chance University with Danny Huffman (December 2024)
01/03/2025
EP199 Rebuilding Lives: The Mission of Second Chance University with Danny Huffman (December 2024)
In this powerful episode of the Building HVAC Science Podcast, hosts Bill Spohn and Eric Kaiser bring on a truly inspiring guest, Danny Huffman, founder of Second Chance University. Danny shares the transformative mission behind his organization, which helps individuals transitioning from incarceration, substance abuse, or homelessness rebuild their lives through HVAC training, life skills development, and career preparation. Danny’s passion shines as he recounts his journey, from growing up on a Texas farm to creating a program that changes lives. Listeners will learn how Second Chance University’s intensive six-week program provides participants not only with technical expertise but also the mental tools and confidence needed to succeed in life and work. With partnerships from organizations like TruTech Tools, CareerSource, and others, Danny emphasizes the importance of doing the right thing and fostering community safety and success. This episode is a must-listen for anyone interested in workforce development, second chances, or the transformative power of education and mentorship. Here is Danny’s Linkedin: And a link to his website: And his email: This episode was recorded in December 2024.
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EP198 Unlocking Building Potential: Ross Trethewey on Curiosity, Collaboration, and Innovation (December 2024)
12/27/2024
EP198 Unlocking Building Potential: Ross Trethewey on Curiosity, Collaboration, and Innovation (December 2024)
In this episode of Building HVAC Science, Bill Spohn and Eric Kaiser are joined by Ross Trethewey, a mechanical engineer, consultant, and building science advocate who also appears on This Old House. Ross shares his journey from being a fifth-generation plumber to becoming a professional engineer with a passion for high-performance buildings. He discusses the critical interplay between building systems and science, highlighting his work in residential and commercial design through his firm, TE2 Engineering. He also delves into his unique projects, including a World War I lookout tower retrofit, which underscores the importance of holistic building assessments. The conversation transitions into the challenges of translating the wealth of building science knowledge into practical applications. Ross emphasizes the need for a structured approach, like checklists or decision trees, to guide professionals through complex building scenarios. He praises initiatives like Better HVAC, which aim to centralize resources for the industry. Finally, Ross explores the importance of mentorship, shared resources, and ongoing learning, advocating for tools like ACCA Manual J, the Passive House Planning Package to prioritize impactful changes in building performance. Ross’ LinkedIn: Ross’ Engineering business: This Old House on YouTube: Passive House Planning Package: Our episode with Adam from Heat Geeks: Building Science Corporation classes and events: Coffee and Caleffi webinars: Enrico Bonilauri’s Emu hands on classes: Pretty Good House Concepts: Pretty Good House Book: Our episode on Pretty Good House: Allison Bailes’ book: BetterHVAC website: Our episode with Shawna Henderson of BlueHouse Energy: HVACR School Symposium: Rocky Mountain Institute Green Upgrade Calculator: The National Institute of Building Sciences: Whole Building Design guide: Residential Energy Book by John Kirgger, 7th edition (530 pages):: Residential Energy Book by Krigger & Dorsi, 2004 edition (320 pages):: This episode was recorded in December 2024.
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EP197 Asbestos, Air Sealing, and ERVs: Navigating Home Renovations with Science (December 2024)
12/20/2024
EP197 Asbestos, Air Sealing, and ERVs: Navigating Home Renovations with Science (December 2024)
In this engaging Building HVAC Science Podcast episode, hosts Bill Spohn and Eric Kaiser welcome Dr. Allison Bailes, a renowned building science expert, to discuss his ongoing home remodeling journey. Allison shares his firsthand experiences of retrofitting a 1960s ranch home in Georgia, uncovering challenges, lessons, and unexpected discoveries along the way. Allison dives deep into the realities of balancing technical expertise with practical decision-making, from asbestos abatement to air sealing, insulation, and innovative systems like Zehnder ERVs. He highlights the importance of communication with contractors, dynamic environmental factors like radon and air leakage, and the challenges of maintaining performance in existing homes. Throughout the episode, listeners gain invaluable insights into the intersection of building science, project management, and homeowner expectations. Whether you're an HVAC professional, a homeowner, or simply curious about building science, this episode provides a wealth of knowledge wrapped in relatable anecdotes and humor. Learn more about his business at and subscribe to his emails. Here is his LinkedIn profile: We sell his book at TruTech: This episode was recorded in December 2024.
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EP196 Bill's review of 2024's podcasts (December 2024)
12/13/2024
EP196 Bill's review of 2024's podcasts (December 2024)
In this episode, Bill Spohn reviews the 52 episodes of the Building HVAC Science Podcast. published in 2024. EP# Published Topic Guest(s) 147 1-5-24 Building science hiaku with Shawna Henderson Shawna Henderson 148 1-12-24 Trade Secrets Revealed- Inside Classset, the Platform Building a Blue-Collar Boom with Cooper Newby Cooper Newby 149 1-19-24 More Than Just Fixing Furnaces: Why NCI is the Heartbeat of the HVAC Industry with Dominick Guarino Dom Guarino 150 1-26-24 Filtering the Future - The Journey of John Ellis in Reinventing Air Quality John Ellis 151 2-2-24 From Ice to Inspiration-Highlights at the AHR Expo .docx ELK and Bill 152 2-9-24 Ralph Wolf's HVAC Odyssey Lessons, Laughs, and Legacies Ralph Wolf 153 2-16-24 HVACR Horizons: From 12-Year-Old Prodigies to Industry Pioneers ELK and Bill 154 2-23-24 Closing the Gap AeroSeal's Quest for Net-Zero Buildings Amit Gupta 155 3-1-24 Sustainable Spaces: The Journey from Efficiency to Humanity in Design Lucas Johnson & Austin 156 3-8-24 Inside the Toolbox- Rethinking HVAC with a High-End Twist With Chris Wisniewski Chris Wisniewski 157 3-15-24 Heat Pumps, Homes, and High Tech Amply Energy's HVAC Evolution Ed Fitz, Eric Smith 158 3-22-24 Comfort, Co-ops, and Climate Care Revolutionizing HVAC in Ontario with Victor Hyman Victor Hyman 159 3-29-24 Blueprints to Bytes How Russ King is Redefining HVAC with Technology Russ King 160 4-5-24 From Recovery to Revolution The Jason Julian HVAC Journey with Jason Julian Jason Julian 161 4-12-24 Connecting the Dots HVAC Excellence Conference Highlights and Industry Evolution witj Josh Crawley & Casey Prater.docx ELK, Josh, Casey 162 4-19-24 Inside HVAC: Wes Davis on Codes, Standards, and Shaping the Future at ACCA 2024 Wes Davis 163 4-26-24 Lies, Damn Lies and Manometer Readings Jesse Smith 164 5-3-24 Behind the Scenes at ACCA 2024: A Dialogue with Ed Janowiak Ed Janowiak 165 5-10-24 Blueprints for Efficiency: Enrico Bonilauri’s Deep Dive into Building Standards Enrico Bonilauri 166 5-17-24 Simplifying Home Electrification: Insights from Zero Homes' Grant Gunnison Grant Gunnison 167 5-24-24 Tech Meets Trades Wyatt Smith's Mission to Modernize Workforce Productivity Wyatt Smith 168 5-31-24 Unveiling HVAC Mastery A Journey of Skill and Passion Matt Akins 169 6-7-24 From Attics to Airwaves Tony Mormino’s HVAC Journey Tony Mormino 170 6-14-24 How to Grow and Scale a Business from the Ground Up Tommy Mello Tommy Mello 171 6-21-24 Random updates from Bill Bill Spohn 172 6-28-24 Tech Trends and HVAC Triumphs: A Denver Summit Recap ELK & Bill 173 7-5-24 Harnessing AI for Healthier Buildings: Insights with Attune's Co-Founder Julien Stamatakis Julien Stamatakis 174 7-12-24 Smart Homes, Smarter Trades: Dan Goodman Discusses Building 36’s Innovations Dan Goodman, 175 7-19-24 From Engineering to Sales: Karine LeBlanc on Building Connections in HVAC Karine Leblanc 176 7-26-24 Empowering Engineers: The HeatGeek Approach to High-Efficiency Heating Adam Chapman 177 8-2-24 Smart Tools, Smarter Tech: Jim Bergmann's MeasureQuick Evolution Jim Bergmann 178 8-9-24 From Gopher to Guru: Steven Rardon's HVAC Journey Stephen Rardon 179 8-16-24 The Science of Hot Water: Insights and Innovations with Gary Klein Gary Klein 180 8-23-24 Home Monitoring Madness: Tracking Energy, Air, and More with Bill and ELK ELK & Bill 181 8-30-24 From Drawings to Durability: Inside the Minds of Building Science Experts ELK & Bill 182 9-6-24 Transforming Homes and Training Minds: The Brynn Cooksey Approach Brynn Cooksey 183 9-13-24 Reinventing Wind Power: Inside the World of Harmony Turbines Chris & Cheryl Moore 184 9-20-24 Cracking the Code: Mastering HVAC Design with Manual S Russ King 185 9-27-24 Building Better Homes: Bridging the Gap Between Energy Ratings and HVAC Steve Byers 186 10-4-24 Unlocking Trades: The Power of Skillcat's Mobile Training Ruchir Shah 187 10-11-24 Revolutionizing Home Comfort: Marco Radocaj’s Balanced Approach to HVAC Marco Radocaj 188 10-18-24 Young HVAC Prodigy: Elena Day’s Journey to EPA Certification at 12 Elana and Jordan Day 189 10-25-24 Breaking the Cycle: Huff's Journey to HVAC Excellence and Industry Change Tom Hoffmaster 190 11-1-24 Breathing Easy: Tackling Outdoor Contaminants in Indoor Spaces Linda Wigington, Rhett Major, Bill Collinge 191 11-8-24 From Building Automation to Smart Homes: The Lumen Cache Revolution Derek Cowburn 192 11-15-24 Building a Legacy: Energy Efficiency and Innovation with Mark Kaiser Mark Kaiser 193 11-22-24 Building Performance with Purpose: Silas Hoeppner’s Journey Silas Hoeppner 194 11-29-24 Behind the Scenes at TruTech Tools: Meet Greg Bokan Greg Bokan 195 12-6-24 Farming Ideas vs. Farming The Land: Reflections from Another Continent Bill Spohn 196 12-13-24 EP196 Bill's review of 2024's podcasts BILL Spohn 197 12-20-24 His remodelling work Allison Bailes 198 12-27-24 Using knowledge we have in the real world Ross Trethewey This episode was recorded in December 2024.
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EP195 Farming Ideas vs. Farming The Land: Reflections from Another Continent with Bill Spohn (November 2024)
12/06/2024
EP195 Farming Ideas vs. Farming The Land: Reflections from Another Continent with Bill Spohn (November 2024)
In this episode of the Building HVAC Science Podcast, Eric dives into Bill's recent two-week trip to Africa, covering his time in Kenya and Tanzania. The discussion is rich with cultural insights, unique experiences, and lessons in building science. Bill shares his observations of local architecture, sustainability practices, and the warmth of the people he met, all against the backdrop of Africa’s breathtaking landscapes and abundant wildlife. The full video presentation will be available shortly on the Trutech Tools YouTube channel: Key highlights include: The distinct climate and seasonal patterns near the equator, where temperatures remained mild (59°F to 85°F) and the length of day varied only slightly year-round. Exploring open-air, sustainable structures designed for natural ventilation and comfort without reliance on modern HVAC systems. Encounters with wildlife, from giraffes and lions to hippos and wildebeests, often seen just steps away from their accommodations. Reflections on cultural humility, local hospitality, and the sharp contrast between rural simplicity and modern amenities. The episode closes with a profound observation from a local guide about life in rural areas versus cities: “In village life, your work sustains you directly (farming crops and livestock), while in city life, your work sustains you financially by farming the ideas in your mind.” This episode was recorded in November 2024.
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