Building HVAC Science

Bill Spohn
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Exploring the science, people, and practices shaping better buildings. The Building HVAC Science Podcast dives into both the technical and human sides of heating, ventilation, air conditioning, and building performance. Hosted by industry veteran Bill Spohn, CEO and co-owner of TruTech Tools, the show reflects Bill's passion for advancing the HVAC craft through practical knowledge, curiosity, and conversation. With more than 250 episodes and counting, the podcast features discussions with contractors, distributors, manufacturers, educators, and thought leaders from across the HVAC and building science communities. Each episode blends field experience with broader industry perspective, helping professionals stay ahead of trends, sharpen their skills, and build stronger businesses. Topics include: New tools, technologies, and field practices Real-world case studies and lessons learned Building performance, comfort, and indoor air quality Industry innovation, workforce development, and the human side of the trades Whether you're a technician in the field, a business owner, a manufacturer, or simply curious about how buildings breathe and perform, Building HVAC Science connects you with the ideas and voices moving the industry forward. Listen on Apple Podcasts, Spotify, or wherever you get your podcasts. This show is a production of TruTech Tools®, LTD.

  1. 1 day ago

    EP280 What 130 Million Homes Can Teach HVAC with Scott Rosenberg (June 2026)

    Quotes from the episode: "You sell an amazing product that represents the future of home heating and cooling. But selling it, promoting it, and capturing consumers' attention is hard. At 257, we use data to help you do that more efficiently."  "The best way to judge the effectiveness of machine learning and AI is by the outcome: Did I sell more at a lower cost?" "It wasn't simply having a heat pump or solar system. Talking about it during the sales process had a positive effect on the home's sale price." How can HVAC contractors identify the homeowners most likely to invest in better systems—and reach them before an emergency replacement? Bill welcomes Scott Rosenberg, co-founder of 257, a home-energy intelligence company using data and machine learning to profile nearly every home in the United States. Scott shares how his earlier work building Roku's advertising business led him from valuable "home screen real estate" to using data to understand actual homes and the people living in them. Scott explains how 257 combines roughly 200 attributes across 130 million households, including building characteristics, estimated HVAC type and age, household demographics, energy assets, and purchase-propensity scores. Its free conversational interface, Pink, lets users ask plain-language questions such as how many owner-occupied homes in a contractor's service area have aging HVAC equipment that appears ready for an upgrade. Rather than relying on a few simple assumptions, the platform uses hundreds of signals to help contractors, manufacturers, utilities, and energy companies improve customer acquisition. The conversation also explores a major study that examines more than 140 million real estate transactions. The research found that homeowners who highlighted solar systems or heat pumps in their real estate listings received a measurable benefit to their home's sale price. Scott discusses the disconnect between consumers, who increasingly value energy efficiency, and real-estate professionals, who may not yet feel prepared to explain these systems. For HVAC contractors, the message is powerful: a high-performance system is not only about lower energy use, comfort, reliability, and safety; properly documented and communicated, it can also contribute to the home's future value and marketability. LinkedIn:https://www.linkedin.com/in/scottarosenberg/ Website:www.257.co Sign up to see the power of this data: https://257.co/#product   The study we mention: https://257.co/blog/highlighting-home-efficiency-boosts-value Canary Media: https://www.canarymedia.com/articles/heat-pumps/heat-pump-home-value   This episode was recorded in June 2026.

  2. 17 Jul

    EP279 Curiosity, Heat Pumps, and the Details That Matter – A Conversation with Edward Louie (July 2026)

    Quotes from the episode:   "Comfort isn't just about air temperature—it's also about the temperature of everything around you."   "If it's difficult to maintain, eventually it simply won't be maintained."   "Stay curious about your built environment. Pay attention, ask questions, and keep learning."   Edward Louie of Pacific Northwest National Laboratory joins Bill Spohn for a thoughtful discussion that goes far beyond heat pumps. Known throughout the building science community for his data-driven LinkedIn posts and willingness to challenge conventional wisdom, Edward shares how curiosity has shaped both his career and his approach to research. From growing up in a drafty, inefficient home to conducting cutting-edge research on building energy, he explains why asking better questions often leads to better buildings. The conversation explores what really determines HVAC performance in the field. Edward discusses why airflow and proper system sizing matter more than headline efficiency ratings, how radiant temperature influences comfort just as much as air temperature, and why installation quality remains the industry's biggest opportunity for improvement. He also shares practical perspectives on dual-fuel systems, the refrigerant transition to R-32 and R-454B, duct leakage, and why equipment manufacturers should place a greater emphasis on serviceability and maintenance. Whether you're a contractor, designer, or building performance professional, this episode is a reminder that excellence comes from paying attention to the details. Edward encourages listeners to stay curious, collect data, challenge assumptions, and never stop learning—because the best improvements in our industry often begin with a simple question.   Edward's LinkedIn:https://www.linkedin.com/in/edward-louie-5a58a13b/   The Building America Solution Center: https://basc.pnnl.gov/   Edward's LinkedIn discussions: https://www.linkedin.com/posts/edward-louie-5a58a13b_heatpump-modernheatpumps-heatpumpperformance-activity-7425636437431115777-TIXA   https://www.linkedin.com/posts/edward-louie-5a58a13b_green-energy-series-25-implementing-a-dual-activity-7314650421640208384-TLYS   https://www.linkedin.com/posts/edward-louie-5a58a13b_green-energy-series-25-implementing-a-dual-activity-7314650421640208384-TLYS   https://www.linkedin.com/posts/edward-louie-5a58a13b_r32-r454b-refrigeranttransition-activity-7331932555643969537-RMws   https://www.linkedin.com/posts/edward-louie-5a58a13b_hvac-heatpump-qualityinstall-activity-7231203656295981057-szH9   https://www.linkedin.com/posts/edward-louie-5a58a13b_hvacmaintenance-indoorairquality-activity-7372829495155724288-DWuh   https://www.linkedin.com/posts/edward-louie-5a58a13b_hvac-hvacservice-datafromreality-activity-7420168545113747456-M-Tp   https://www.linkedin.com/posts/edward-louie-5a58a13b_duct-design-significantly-impacts-duct-performance-activity-7291555164618924032-OhhC   This episode was recorded in July 2026.

  3. 10 Jul

    EP278 From Boiler Timers to Predictive Control: Smarter Heat for Multifamily Buildings with Heather Zoberman from Entech (June 2026)

    Quotes from the episode: "Technology does its best work when it turns invisible problems into obvious next steps." "Most buildings are already telling us what they need. The trick is finally learning how to listen." "You can't optimize what you can't see, and old buildings have been hiding their stories in boiler rooms for decades." In this episode of Building HVAC Science, Bill speaks with Heather Zoberman of ENTECH about how older multifamily buildings can move from basic, wasteful boiler control toward smarter, data-driven heating and cooling management. Heather explains that many large buildings are still controlled by simple timers and fixed-temperature resets, often leading to overheated apartments, open windows, tenant discomfort, and wasted energy. Heather describes ENTECH's approach: proprietary boiler-room hardware, wireless apartment sensors, cloud-based analytics, alerts, and a service team that actively monitors and optimizes building performance. Rather than simply reacting to tenant complaints or high utility bills, the system gives owners and operators visibility into what is really happening across the building, including hidden problems such as return-line leaks, short-cycling, and overheating caused by designing around the coldest apartment. The conversation also touches on New York City's Local Law 97, carbon reduction, compliance, and the opportunity for contractors, engineers, and boiler professionals to recommend or partner with technology providers like ENTECH. Heather's core message is that the industry is moving rapidly from reactive controls to predictive building management, helping reduce energy waste, improve comfort, extend equipment life, and lower emissions. LinkedIn:https://www.linkedin.com/in/heather-zoberman-127769144/ Website:https://entechsmart.com/ Email contacts: Laura@entechsmart.com  Heather@entechsmart.com Phone: 732-730-1595     This episode was recorded in June 2026.

  4. 3 Jul

    EP277 Dirty Little Secret: Why Heat Pumps Need Deep Cleaning with Gabriel Erde-Cohen (June 2026)

    Quotes from the episode: "Heat pumps can't meet their promise if they're not properly maintained." "Vacuuming the filter matters, but it is not the same thing as deep cleaning the system." "If it has a coil and a fan, we can clean it." "Electrification only works as intended when the equipment keeps working as intended." In this episode of Building HVAC Science, Bill talks with Gabriel Erde-Cohen, founder of We Clean Heat Pumps, about an often-overlooked part of electrification: what happens to heat pumps after installation. Gabriel shares how his Vermont-based business grew from cleaning mini-splits for a family installation company into a specialized maintenance company operating across New England and in markets around the country. His core point is simple: heat pumps cannot deliver on their promise of efficiency, comfort, durability, and healthier indoor air if they are not properly cleaned and maintained. Gabriel explains the difference between basic homeowner filter care and true deep cleaning. His team removes covers, protects the home, uses low-pressure washing, alkaline soap, enzyme treatments, and active condensate-line vacuuming to remove biological buildup, dust, debris, and biofilm from coils, fans, pans, and outdoor units. He is careful to distinguish maintenance from repair, noting that his company refers service issues back to installer partners rather than competing with them. The discussion also covers ducted and ductless systems, PTACs, ERVs, HRVs, outdoor units, heat pump water heaters, and the importance of not simply killing biological material but actually removing it from the building. The conversation broadens into the future of the industry: annual cleaning, monitoring devices, commissioning, efficiency data, installer partnerships, and the potential for maintenance standards or even a trade association. Gabriel argues that annual deep cleaning is usually the right starting point, though real-world conditions can vary widely. He also shares early observations of efficiency improvements after cleaning and emphasizes that better data will be needed to help utilities, manufacturers, and programs recognize heat pump cleaning as part of the larger electrification and indoor air quality picture Email: Gabriel@WeCleanHeatPumps.com Website: www.WeCleanHeatPumps.com Installer Page: Linkedin: https://www.linkedin.com/in/gabriel-erde-cohen-591146226/   This episode was recorded in June 2026.

  5. 26 Jun

    EP276 When "Passed Inspection" Isn't Good Enough with Cy Porter (May 2026)

    Quotes from the episode: "Passed inspection is not the same as built correctly." "The best inspectors keep learning, because no one person masters every trade, every code, and every overlap." "Small defects do not stay small when they are hidden behind walls, ceilings, and warranty paperwork." In this episode of Building HVAC Science, Bill Spohn talks with Cy Porter of CYFY Home Inspections, an Arizona-based home inspector known for his blunt, high-energy social media videos that expose defects in new-construction homes. Cy specializes in one-year and two-year warranty inspections, helping homeowners identify issues missed at closing, including gas leaks, broken trusses, shower pan failures, air-sealing problems, roof defects, and code violations. His work sits at the intersection of construction quality, homeowner advocacy, and the sometimes uncomfortable gap between "passed inspection" and "actually built right." Cy explains how Arizona's implied warranty process gives homeowners a path to challenge legitimate construction defects, and how state investigators can issue written directives or citations when builders fail to correct violations. He also explains why patience, proper tool use, and cross-trade humility matter, especially when diagnosing small gas leaks, blower-door failures, and hidden installation mistakes. His stories reveal how small defects can become larger problems with safety, durability, comfort, and performance when no one catches them early. For HVAC, building performance, HERS©, and home inspection professionals, this conversation is a reminder that quality construction requires more than a signed-off checklist. It takes curiosity, documentation, collaboration, and the willingness to be corrected. Cy's approach may ruffle feathers, but his larger message is hard to ignore: homeowners deserve homes that meet the standards they were promised. Cy's website: https://www.cyfyhi.com/   Cy's YouTube: https://www.youtube.com/@cyfyhomeinspections   Affiliate Links: beacons.ai/cyfy Facebook: facebook.com/cyfyhomeinspections TikTok: tiktok.com/@cyfyhomeinspections Instagram: instagram.com/cyfyhomeinspections   This episode was recorded in May 2026.

  6. 19 Jun

    EP275 The Sound of Better Buildings with Kieren McCord (May 2026)

    Quotes from the episode: "The tighter your envelope, the more attention you have to pay to ventilation and indoor air quality." "The acoustics of the ordinary rarely gets attention." "There's so much good work being done, so much data being collected, and oftentimes it doesn't leave the hard drive." "Noise annoyance may be one of the things people are most passionate about." In this episode of the Building HVAC Science Podcast, Bill Spohn welcomes Kieren McCord, a research scientist at Pacific Northwest National Laboratory, for a conversation about indoor environmental quality, acoustic comfort, and the often-overlooked benefits of building performance upgrades. Kieren shares her path from music and acoustics to building science, explaining how sound, comfort, air quality, thermal resilience, and human perception intersect in homes. The conversation explores how energy upgrades such as better windows, tighter envelopes, and improved insulation can create benefits beyond lower utility bills. Kieren explains how acoustic performance is measured, why low-frequency sound is difficult to block, how decibel weightings like dBA and dBZ work, and why human response to noise can be highly personal. She also discusses the promise and limitations of smartphone-based sound measurements, including the potential for making acoustic data collection more accessible to HERS© raters and home performance professionals. Kieren also shares details from recent field research on a Chicago window retrofit, in which triple-pane acoustic windows and careful installation resulted in a 35% reduction in whole-home air leakage. While the noise data is still being processed, the study aims to link measurable building improvements to homeowners' perceptions of comfort, quiet, smell, temperature, and overall livability. Her closing message is a call for more shared field data, more collaboration, and a stronger connection between academic research and the practical work being done every day by contractors, raters, and building performance professionals. Kieren's LinkedIn: https://www.linkedin.com/in/kieren-m/   US DOE Office of Scientific and Technical Information; osti.gov   Physical Phone Experiments: https://phyphox.org/       This episode was recorded in May 2026.

  7. 12 Jun

    EP274 The Heat Pump Summit Is Building More Than Better Systems with Brent Davidson (May 2026)

    Quotes from the episode: "Stop trying to HVAC your way out of bad buildings, and your results will market themselves." "The quality work and word of mouth are real when you're doing building science-backed work with quality staff." "Come with problems you're actively trying to work on and meet others who can help you work on them." In this episode of Building HVAC Science, Bill welcomes back Brent Davidson of the U.S. Heat Pump Summit for his third appearance. Brent shares what emerged from the first full-scale national Heat Pump Summit held in Massachusetts in November 2025, including the strong appetite among contractors for practical, business-focused heat pump education. The event is designed not as a policy forum or sales-heavy conference, but as a contractor-facing gathering where HVAC and plumbing professionals can learn how to build stronger, more profitable businesses around heat pumps, building science, and quality installation practices. Brent also discusses the launch of The Heat Pump Edge, a twice-weekly newsletter that extends the Summit's mission year-round by profiling successful contractors and sharing practical takeaways that others can apply in their own businesses. The conversation highlights contractors who are growing through training, word of mouth, building science, and better customer outcomes, not just bigger marketing budgets. Brent emphasizes that the best heat pump businesses are often led by people willing to share openly, train deeply, and professionalize the trades from the inside out. The episode closes with a look ahead to the next U.S. Heat Pump Summit, scheduled for September 15–16, 2026, in Worcester, Massachusetts. Brent describes the event as a place for motivated contractors to bring real business challenges, meet peers, learn from successful operators, and connect with exhibitors focused on the future of residential heat pumps. Bill sums it up with a very Pittsburgh-flavored thought: if your business needs help, look for the helpers at the Heat Pump Summit. Link to the Summit and free Tickets offer for contractors (as available): https://www.usheatpumpsummit.com/ Brent'sLinkedIn: https://www.linkedin.com/in/brentdavidson/   Brent's email: Brent@USHeeatPumpSummit.com   The newsletter: www.TheTheHeatPumpEdge.com     This episode was recorded in May 2026.

  8. 8 Jun

    EP273 Think Like an Air Molecule with Dan Stradford (May 2026)

    Quotes from the episode: "Ducts matter. Nobody cares much about them until something goes wrong." "HVAC systems are designed assuming clean, bare sheet metal." "Even a small layer of dust can become a mountain range to an air molecule." "Think like an air molecule." In this episode, Bill speaks with Dan Stradford of Action Duct Cleaning about what really happens inside HVAC duct systems over time and why cleaning can matter more than many people realize. Dan shares how the duct cleaning industry evolved from its "wild west" early days into a more standardized field through NADCA, with better equipment, training, and certification practices. Dan explains that even a thin layer of dust can disrupt airflow, increase turbulence, raise static pressure, and reduce system efficiency. Drawing from NADCA energy studies, he describes how cleaning returns, supplies, fans, coils, and air handlers each contributed measurable performance improvements, including major reductions in fan and compressor energy use. The conversation also covers how HVAC professionals can evaluate duct-cleaning contractors, when homeowners or building owners should consider cleaning, and why ductwork deserves more attention as a hidden yet critical part of indoor air quality, comfort, and system performance. Dan'sLinkedIn: https://www.linkedin.com/in/dan-stradford-b7509123/ The research paper we reference: https://www.sciencedirect.com/science/article/pii/S0378778824012635 Another research paper on: Effects of HVAC Cleaning on Indoor Air Quality: A Multi-Season Demonstration of Exposure Assessment in Occupied Public School https://www.e3s-conferences.org/articles/e3sconf/pdf/2026/34/e3sconf_iaqvec2026_02030.pdf Dan's company: https://actionduct.com/ The video Dan referenced: https://www.youtube.com/watch?v=HkGl7zljqN8 The National Air Duct Cleaners Association: https://nadca.com/ This episode was recorded in May 2026.

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About

Exploring the science, people, and practices shaping better buildings. The Building HVAC Science Podcast dives into both the technical and human sides of heating, ventilation, air conditioning, and building performance. Hosted by industry veteran Bill Spohn, CEO and co-owner of TruTech Tools, the show reflects Bill's passion for advancing the HVAC craft through practical knowledge, curiosity, and conversation. With more than 250 episodes and counting, the podcast features discussions with contractors, distributors, manufacturers, educators, and thought leaders from across the HVAC and building science communities. Each episode blends field experience with broader industry perspective, helping professionals stay ahead of trends, sharpen their skills, and build stronger businesses. Topics include: New tools, technologies, and field practices Real-world case studies and lessons learned Building performance, comfort, and indoor air quality Industry innovation, workforce development, and the human side of the trades Whether you're a technician in the field, a business owner, a manufacturer, or simply curious about how buildings breathe and perform, Building HVAC Science connects you with the ideas and voices moving the industry forward. Listen on Apple Podcasts, Spotify, or wherever you get your podcasts. This show is a production of TruTech Tools®, LTD.

Information

  • Creator
    Bill Spohn
  • Years Active
    2017 - 2026
  • Episodes
    280
  • Rating
    Clean
  • Copyright
    © 2026 TruTechTools, LTD 057074
  • Show Website
    Building HVAC Science

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