Building HVAC Science

Bill Spohn
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Uncover the secrets of healthy, comfortable, and energy-efficient buildings with the Building HVAC Science podcast. Join HVAC and building performance experts Eric Kaiser and Bill Spohn, Sr., as they delve into the fascinating world of building science and HVAC diagnostics. From exploring the latest advancements in measurement technology to examining the impact of building science and proper HVAC design and installation on human health and safety, this podcast is your one-stop shop for learning about all things in the built environment. In each episode, you'll gain valuable insights from industry leaders and discover practical tips for changing the way you approach your work. Whether you're a homeowner, facility manager, building performance or HVAC professional, this podcast is essential listening for anyone who cares about creating healthy, comfortable, and energy-efficient buildings. Here's what you can expect from the Building HVAC Science podcast: In-depth discussions on a wide range of building science and HVAC topics Interviews with experts from across the industry Practical tips for improving your building's performance Insights into the latest advancements in HVAC technology The occasional random topic

  1. 2D AGO

    EP250 Beyond the Equipment: Reflections on 250 Episodes of HVAC and Building Science with Eric and Bill (December 2025)

    Quotes from the Episode: "Good building systems don't start with equipment—they start with a plan and a thoughtful process." "Most comfort problems aren't equipment problems; they're building problems we haven't taken the time to understand." "If even one episode helps someone take the next step in their career, then it's all been worth it." Episode 250 of the Building HVAC Science Podcast flips the script. Instead of Bill Spohn and Eric Kaiser doing the interviewing, TruTech Tools' Senior Marketing Manager Ginny Hebert steps into the host seat to reflect on 250 episodes of conversations about comfort, buildings, and the people who work on them. What follows is an honest, thoughtful look back at what the show has uncovered—not just about HVAC systems, but about how people learn, think, and grow within the industry. Bill and Eric reflect on how their understanding of comfort has evolved, especially regarding concepts such as heat transfer, mean radiant temperature, air sealing, and treating the house as a system rather than a collection of parts. They discuss how many "equipment problems" are actually building or design problems, and why taking time to think—really think—about a problem is often the most valuable (and most overlooked) practice in the trade. The conversation highlights how technology, connected tools, and computing power have improved diagnostics, while also reinforcing that good outcomes still depend on mindset and process. The episode also looks forward. From normalizing system testing and indoor air quality assessments to improving how comfort is predicted and communicated, Bill and Eric share what they hope will become everyday practice over the next decade. Above all, this milestone episode is a thank-you to listeners, guests, and the broader HVAC and building science community—for staying curious, open-minded, and committed to doing better work for the people who live in the buildings we touch. Ginny's LinkedIn: https://www.linkedin.com/in/ginny-hebert/ Eric's LinkedIn: https://www.linkedin.com/in/eric-kaiser-323a1563/ Bill's LinkedIn: https://www.linkedin.com/in/billspohn/   This episode was recorded in December 2025.

    33 min

  2. DEC 19

    EP249 The Hidden Hazards: CO, H₂S and the Tech Behind Modern Gas Detection With Dave Massner from Sensorcon (December 2025)

    Episode quotes: "Hydrogen sulfide doesn't announce itself. It can drift in, hit your mucus membranes, and start causing real harm before you know it's there." "You can't treat sensor response like magic—it's physics, chemistry, and smart filtering working together to tell you what's actually happening in the space." In this episode, Bill & Eric sit down with Dave Massner from Sensorcon, a long-time technical contributor in the world of portable gas detection, to dig into the realities behind CO, H₂S, and O₂ sensing in both HVAC and industrial environments. Bill recaps the origins of their relationship with Sensorcon, which sets the stage for Dave to explain why gas detection still matters and brings in real-world examples—from oil fields to everyday equipment rooms—to show how invisible hazards shape how techs should approach safety. The conversation explores lesser-understood threats like hydrogen sulfide (H₂S)—a gas that can travel with the wind in oil and gas regions and incapacitate workers before they realize it's there. We discuss the physiology, the chemistry, and the grim speed at which exposure can become deadly. From there, we shift to oxygen depletion, clarifying what "too low" actually means in field work and why measuring O₂ is just as important as detecting toxic gases. The episode also gets into the nuts and bolts of sensor behavior: signal-to-noise ratios, filtering, raw output, response time, and the clever algorithms that help instruments stabilize faster without sacrificing accuracy. Toward the end, we highlight Sensorcon's ongoing efforts in training, education, and transparency, pointing listeners to the company's technical blog posts, videos, and calibration resources. We also make the case for low-level CO alarms and why TruTech Tools has championed them for over a decade. As we wrap up, we leave listeners with a simple takeaway: understand your sensors, understand your risks, and choose equipment that treats safety as something more than a checkbox. Dave's LinkedIn: https://www.linkedin.com/in/david-massner-30291189/ Sensorcon at TTT: https://trutechtools.com/sensorcon-solutions.html Sensorcon blog posts:https://sensorcon-sensing-products-by-molex.myshopify.com/blogs/news/ Sensorcon  videos: https://sensorcon-sensing-products-by-molex.myshopify.com/pages/inspector-videos Low-level CO alarms at TruTech Tools: https://trutechtools.com/installedco   This episode was recorded in December 2025.

    46 min

  3. DEC 12

    EP248 Balanced Comfort, Brutal Lessons: Scaling, Losing Half Your Revenue, and Starting Over with AI with Aaron Husak (November 2025)

    "Inspect your marketing the way you'd inspect a home—run diagnostics, don't guess." – Aaron Husak "Attitude is way more important than aptitude. One bad apple really can infect the whole company." – Aaron Husak In this episode of the Building HVAC Science podcast, Eric and Bill sit down with long-time friend and contractor-turned-marketing pro, Aaron Husak. Aaron traces his winding path from solar in the mid-2000s to building performance and BPI training, and then to founding Balanced Comfort in Fresno, CA. What started as a small HERS and energy-audit firm bootstrapped its way into insulation, HVAC, and weatherization, eventually landing on the Inc. 5000 list four times and scaling from $1.3M to over $12M in just a few years. Along the way, Aaron learned the complex realities of rapid growth: hiring quickly, depending on rebate programs, uncovering serious gaps in back-office accounting and HR, and navigating California's legal landscape. Things got especially rough when PG&E abruptly pulled a weatherization program that made up half of their revenue, right as Aaron was also dealing with the personal loss of both his parents. A rescue buyer ultimately acquired the company in early 2025, giving Aaron a hard-earned exit. From that experience, Aaron pulls out lessons for contractors who want to grow without blowing themselves up. He emphasizes perseverance, but also warns that good field tech screening doesn't automatically translate into good screening for accountants, HR, and support staff. He talks about the cost of keeping the wrong people too long, the importance of outside eyes on your books and compliance, and why attitude beats aptitude when building a healthy culture. He also calls out how easy it is to underestimate the impact of programs, receivables, and legal exposure—especially in states where "it doesn't matter if you're right, you still have to pay the attorney." Today, Aaron has pivoted into his next chapter with Sequoia GEO, a marketing firm focused on contractors and local service businesses, with a special emphasis on AI and "GEO" (Generative Engine Optimization). He explains why your Google Business Profile is the low-hanging fruit almost everyone neglects, how AI tools and devices like Plaud can turn field conversations into high-value website content, and why AI "likes structure" (bullets, lists, and real stories). The episode closes with practical advice: inspect your marketing like you would inspect a home, use affordable diagnostic tools to see what's really happening online, stay transparent with customers about recording and privacy, and treat expensive mistakes as lessons that tighten your processes for the future. Aaron's LinkedIn:https://www.linkedin.com/in/ahusak Aaron's Company: www.SequioaGEO.com Aaron's Blog: https://www.sequoiageo.com/blog/categories/google-business-profile   This episode was recorded in November 2025.

    39 min

  4. DEC 5

    EP247 From CEO to Chief Education Officer: Bill Spohn on Legacy, Leadership & Better HVAC (November 2025)

    "Get mad at the problem, not the person. When people feel safe, they'll actually bring you the real issues." - Bill Spohn "We're woven into the fabric of this industry. The industry made me—so in a way, it owns me." - Bill Spohn "What we have to learn to do, we learn by doing." - Aristotle In this episode, Eric turns the mic around and interviews his co-host, Bill Spohn, about the evolution of TruTech Tools, his leadership philosophy, and why he's shifting from "Chief Executive Officer" to "Chief Education Officer." Bill traces the roots of TruTech back to late 2006, when a suggestion at a Testo Christmas party planted the seed for an online test-instrument business that launched in April 2007. He talks about how TruTech has become "woven into the fabric of the industry," helping connect HVAC and building performance pros while focusing on specialty tools, education, and best practices. A big chunk of the conversation is about people: attracting and retaining the right employees, and running the business through the lens of core values. Bill and Eric walk through TruTech's four core values—Do the Right Thing, Be a Team Player, Get It Done, and Be Attentive—and how they were distilled from nearly 80 traits the leadership team admired in their co-workers. Bill explains how these values show up in hiring (situational questions), in problem-solving (getting mad at the problem, not the person, and using the "five whys"), and in daily decisions about how to treat customers and each other. Bill also opens up about his intentional five-year transition plan out of day-to-day leadership and into a more advisory and educational role, including transferring ownership and the President role to his son. He shares why he didn't want to be the owner who leaves on a stretcher—or the one who keeps wandering back in and undermining the next generation. Instead, he's leaning into training the team, mentoring startups, and building out the Better HVAC directory as a free resource for contractors and consumers. Along the way, he and Eric talk about the "comfort industry" as a whole, the blending of HVAC and building performance, the importance of passing down institutional knowledge, and even Bill's side quest to learn rock guitar and someday join the Building Science Boogie Band.   This episode was recorded in November 2025.

    33 min

  5. NOV 28

    EP246 Beyond MERV: The Truth About Smoke, Sensors, and Standards With Sissi Liu (October 2025)

    Episode quotes: "Below about 0.4 microns, many low-cost PM sensors are basically guessing—right where wildfire smoke and aerosols live." — Sissi Liu "Electrostatic filters can look great at first—and then fall off a cliff in smoke. Pressure drop won't warn you." — Sissi Liu "Science is a way of thinking much more than it is a body of knowledge." — Carl Sagan   Eric digs into the "fresh air" myth with Sissi Liu, CEO/co-founder of Metalmark Innovations and active ASHRAE committee member. Sissi explains why "outdoor = fresh" is context-dependent—urban pollution, agricultural activity, and especially wildfire smoke can make outdoor air worse than indoor air. Because air quality is dynamic, she pushes for comparing indoor and outdoor conditions in real time and ventilating intelligently, with attention to the energy cost of conditioning outside air. They then get nerdy on sensors and filters. Many low-cost PM2.5 laser-scattering sensors struggle below ~0.4 µm and can misread certain particle types (e.g., dark/black carbon), which matters because smoke and pathogen-carrying aerosols often live in the ~0.1–0.3 µm range. On filtration, Sissi contrasts mechanical vs. electrostatically charged media: electrostatic filters start efficiently with low pressure drop but can lose effectiveness within hours in smoke events. In contrast, mechanical media hold up better (though at higher pressure). She highlights ASHRAE 52.2 Appendix J (loaded efficiency) and argues that standards—along with reporting practices—must evolve for wildfire realities. Key takeaways "Fresh air" is conditional: check outdoor AQ (and indoor) before cranking up ventilation. IAQ is dynamic; test and compare locally rather than assuming static conditions. Consumer PM sensors can under-count the tiniest and darkest particles; treat data with caveats. Wildfire smoke clusters in the most-penetrating particle size (~0.1–0.3 µm) for many filters. Electrostatic filters may degrade fast in smoke; pressure drop alone won't reveal failure. ASHRAE standards (e.g., 52.2 Appendix J, SGPC-44) are evolving—industry needs to catch up. Sissi's LinkedIn: https://www.linkedin.com/in/liusissi/ Metalmark website: https://metalmark.xyz/     This episode was recorded in October 2025.

    39 min

  6. NOV 21

    EP245 Retrofit the Future: Inside PHIUS's New Revive Standard with Al Mitchell and Haley Harlow (October 2025)

    Eric Kaiser sits down with Haley Harlow and Al Mitchell from PHIUS (Passive House Institute US) to explore Revive 2024, a groundbreaking new retrofit standard focused on thermal resilience and healthier, safer existing buildings. Haley shares her path from Pennsylvania College of Technology to her current role managing building certifications at PHIUS. At the same time, Al recounts his journey from aspiring car engineer to building scientist, drawn to the elegant complexity of whole-building systems. Together, they unpack how Revive differs from traditional PHIUS new-construction standards. Instead of focusing on heating and cooling load targets, Revive emphasizes thermal resilience—a building's ability to remain habitable for up to a week during power outages or extreme weather. They also discuss ReviveCalc, PHIUS's new software tool for analyzing retrofit scenarios, allowing designers to test various upgrade packages, balance cost and performance, and phase improvements over time. The tool incorporates lifecycle cost analysis, dynamic energy modeling, and resilience metrics, making advanced design decisions more accessible to real-world projects. Both guests share their excitement about addressing the massive stock of underperforming existing buildings. Haley connects it to her own experience growing up in energy-intensive apartments, while Al reflects on how to use today's computing power better to design resilient, efficient homes. They close with a shared message: retrofitting our current buildings is not only possible, it's essential for the future of sustainability, comfort, and community resilience. Key Takeaways PHIUS Revive 2024 focuses on retrofits, bringing resilience and energy equity to the existing building stock. Thermal resilience replaces traditional load metrics, ensuring buildings remain habitable during grid or system failures. ReviveCalc helps users model envelope and mechanical upgrades, estimate lifecycle costs, and optimize phase-by-phase improvements. The program aligns with ASHRAE Guideline 0.2 for commissioning and integrates EPA's Energy Savings Plus Health framework. Air sealing remains the top "bang for the buck" retrofit measure for both comfort and energy savings. CPHC certification (Certified PHIUS Consultant) is open to anyone—no degree required. The Revive approach balances performance, cost, and practicality for real-world projects. Haley's LinkedIn: https://www.linkedin.com/in/haley-harlow-3965b41b5 Al's LinkedIn: https://www.linkedin.com/in/al-mitchell-bb74827b/ Info on Phius Revive 2024: https://www.phius.org/phius-revive-2024     This episode was recorded in October 2025.

    39 min

  7. NOV 14

    EP244 Envelope, HVAC, and Humans: Solving the IAQ Puzzle with Brantley May (October 2025)

    Quotes by Brantley: "Most moisture problems are a three-way dance—envelope, mechanicals, and the occupants."   "Skim the light, don't blast it. The right flashlight technique makes the invisible visible."   "If you only understand one piece of the system, you're solving 1/3 of the problem."   Indoor environmental specialist Brantley May joins the show to unpack how he investigates moisture, mold, and air-quality problems through building forensics. Starting as a mold remediator in his family business, Brantley shifted to assessment work and now runs national investigations that pinpoint root causes—from envelope leaks and interstitial space connections to mechanical design and operation issues. He explains the value of "flashlight technique" (skimming light across surfaces to reveal early hyaline mold) and why good eyes, a light, and critical thinking are still the most important tools in the bag.   Brantley walks through his toolkit—manometers, blower doors, pressure pans, thermal imagers, moisture meters, anemometers/flow hoods, data loggers, and even a backup sling psychrometer—plus his new favorite screening instrument, the InstaScope, which provides real-time readings on particulates, mold/pollen, bacteria/virus, VOCs, and CO₂. Investigations culminate in a report and protocols for the envelope, mechanicals, and remediation, often requiring tight coordination across multiple trades. He stresses pre-drywall inspections, "red-pen" continuous air/thermal barrier checks, and long-term monitoring to verify theories—especially on complex modern designs where vented attics and interstitial spaces end up unintentionally connected.   A major theme: cross-disciplinary literacy. Most condensation/humidity problems stem from three interacting factors—envelope failure, mechanical failure, and occupant behavior—so HVAC pros must understand building science, and envelope pros must understand HVAC. Brantley shares how training (BPI, IICRC), mentorship, microscopy work (McCrone/Ochsner), and relentless curiosity shaped his practice. Watch for him at industry events (HVACR School Symposium, Build Show)—maybe even submitting a short BryX talk next time.   Brantley's LinkedIn: https://www.linkedin.com/in/brantley-may-b3988283/   His company: EnviroHealth.co   His Instagram: https://www.instagram.com/brantley.iaq/   McRone Institute: https://mccroneinstitute.org/   Instascope: https://www.instascopeair.com/   Institute of Inspection Cleaning and Restoration Certification: https://iicrc.org/   Building Performance Institute: https://www.bpi.org/   Building Science Summer Camp:  https://buildingscience.com/events/twenty-fifth-annual-westford-symposium-building-science   National Home Performance Conference: https://building-performance.org/events/national/     This episode was recorded in October 2025.

    29 min

  8. NOV 7

    EP243 Three Sensors, One Strategy: Making Maintenance Truly Smart With Kevin Weaver from SmartAC (October 2025)

    Episode Quotes from Kevin Weaver:   "If we can quantify delivered capacity on the air side, we can work our way back to what's happening on the refrigerant side."    "We don't have to diagnose everything remotely — we have to be great at saying, 'there's a problem,' and prioritizing action."    "Even the best design can be wrecked at installation. Execution matters."    Chief Engineering Officer Kevin Weaver joins Eric and Bill to go beyond "remote monitoring" and explain how SmartAC is really a loyalty and trade-intelligence platform for residential HVAC. With three simple wireless sensors — a supply-air "comfort" sensor (temp/RH), a filter sensor (temp/static pressure), and a water sensor — plus a cloud-connected hub, SmartAC tracks delivered capacity and trends changes over time. That minimum viable data set lets contractors catch problems early, prioritize the right calls, and give homeowners peace of mind without needing full remote gauges.   Kevin walks through the contractor toolset, which includes a white-labeled homeowner app, a Pro app for technicians, and a partner dashboard that also integrates with Field Service Management. (FSM) systems like ServiceTitan. The result is fewer emergency visits, healthier memberships, and durable customer relationships (i.e., less ad spend, more lifetime value). He previews Gen-2 hardware (more sensing in more places, stronger radios), battery options (18 months on AA lithiums or 5–8 years with a long-life pack), and notes that SmartAC is approaching 100k homes sold — building one of the most extensive residential HVAC data sets for richer insights across brands, geographies, and system types.   We conclude with wisdom from Kevin's Texas A&M research: even great designs can fail due to poor execution. Right-size returns, stretch flex, use collars and mastic, and keep static in check. SmartAC's data helps expose oversizing, blower mis-settings, and undersized returns in days, transforming maintenance plans into smart maintenance and turning "transactional" customers into lifelong customers.   Kevin's LinkedIn: https://www.linkedin.com/in/kevin-weaver/ SmartAC: www.smartac.com   Earlier episode with founder Josh Teekell (Ep. 136):  https://www.buildinghvacscience.com/ep136-utilizing-smart-maintenance-plans-benefits-your-customers-and-your-business-with-josh-teekell/   This episode was recorded in October 2025.

    35 min
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4.7
out of 5
74 Ratings

About

Uncover the secrets of healthy, comfortable, and energy-efficient buildings with the Building HVAC Science podcast. Join HVAC and building performance experts Eric Kaiser and Bill Spohn, Sr., as they delve into the fascinating world of building science and HVAC diagnostics. From exploring the latest advancements in measurement technology to examining the impact of building science and proper HVAC design and installation on human health and safety, this podcast is your one-stop shop for learning about all things in the built environment. In each episode, you'll gain valuable insights from industry leaders and discover practical tips for changing the way you approach your work. Whether you're a homeowner, facility manager, building performance or HVAC professional, this podcast is essential listening for anyone who cares about creating healthy, comfortable, and energy-efficient buildings. Here's what you can expect from the Building HVAC Science podcast: In-depth discussions on a wide range of building science and HVAC topics Interviews with experts from across the industry Practical tips for improving your building's performance Insights into the latest advancements in HVAC technology The occasional random topic

Information

  • Creator
    Bill Spohn
  • Years Active
    2017 - 2025
  • Episodes
    250
  • Rating
    Clean
  • Copyright
    © 2025 TruTechTools, LTD 057074
  • Show Website
    Building HVAC Science

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