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Home Diagnosis is the first-ever television series about measured home performance and building science. Grace and Corbett Lunsford use performance testing tools like infrared thermal cameras, blower doors, pressure gauges, and contaminant sensors to diagnose homes with mystery problems across America. The show also features the #TinyLab, the world's highest performance tiny house on wheels, which toured 13,000 miles to 34 cities on the Proof Is Possible Tour in 2016-17.

HVAC Installers Who Use Science!

 Welcome to The List

The List is a voluntary, un-vetted directory of HVAC Installers across North America who will trust and follow, or even perform in-house, design calculations (Manual J, S, and D). These companies have self-selected, by affirming the following questions:

  • I understand that the first step in proper HVAC design is a Manual J (or equivalent) load calculation, targeting the 99% hottest and coldest design temperatures the home will be exposed to

  • I understand that in more airtight, insulated, and ventilated homes the load may prove to be between 1000-2500 sq ft per ton of cooling

  • If I follow the software-based design correctly, I understand that it is not my problem if the home is not as airtight as the builder or client told me it would be, and a simple blower door test can prove that any performance issues are the enclosure's fault rather than my HVAC installation's

Learn to perform top-tier Ventilation System Design for homes anywhere on Earth

Here are two lengthy videos where I explain how HVAC calculations work, and how to read through them: