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Njuneer
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1,348 Posts
Discussion Starter · #1 ·
My HVAC system is built with one main plenum that projects into the attic and all branch take offs come from that with insulated flex. I am curious how much heat gain would be typical or "acceptable" from plenum temp to vent temp? I am seeing about a 6-8*F delta T. I am getting ready to blow more insulation tomorrow because I realize I have some issues up there and looking to bury the HVAC branches to help with this issue. Just want an idea what is acceptable.

I also realize that having these lines outside the heated/cooled envelope is not ideal but this system was installed into an existing home so some things were not practical.
 
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