Originally Posted by
Steve Lowery
I think that the leakage regarding the unconditioned space affecting efficiency is miniscule ...
Steve,
I could go back to when I was in business, heck, I could go back just a few days to when I helped another inspector, and show you photos of AHU after AHU which was not fully taped up or sealed (conduit entries, thermostat cable entires, other openings and entries) which had no attempt to seal them up by the installing HVAC contractor (new houses) or by the serving HVAC contractor (new and existing houses).
Combine that with the fact that the AHU itself if not in 75 degree conditioned space but is in 95+ degree unconditioned garage and that is a lot of extra Btus which need to be conditioned.