This episode started in 2018. I have had the notion for quite a while (since 2018) of the need for a responsible contractor network or RCN. This came up when my widowed sister that lives many states away was having trouble with her HVAC system in her home. She asked who I might recommend. I had no immediate answer. I created a few basic principles of conduct, process, and integrity for RCN. I even bought a domain and mentioned the idea a few times (at the HVAC School Symposium) and received some decent response. Then I fell into other rabbit holes. Fast forward to 2023 and I came across a list put forth by Corbett Lunsford: https://homediagnosis.tv/hvac-installers “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 installations”   Dang, he did it! Then I scrolled through the list (now 51 strong) and saw someone in Pittsburgh where I live! And that’s how this episode all started. Oh, and Mat has a very interesting backstory that I think you will enjoy. Mat Stone Mat@home-mechanix.comwww.Home-Mechanix.com   This episode was recorded in August 2023.   PS we referred to Episode 21 with Ed Kisiel Super tight houses using standard construction.