EP273 Think Like an Air Molecule with Dan Stradford (May 2026)
About this episode
Bill Spohn interviews Dan Stradford about the importance of duct cleaning in HVAC systems and its impact on efficiency and indoor air quality.
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…
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