[T77911S]

this system is really messed up as far as air supply and return air.
there is about 2ft between the drop ceiling and the roof. its about 60 degrees in there. we have to go through this space to get to the roof.
I was telling the other guy I think you have air supply leak leaking into the space above the ceiling. so we get to looking at it, the air supply pumps air INTO that space then I think is come out around the edges of the walls. what I thought were the supply ducts in the ceiling are actually the returns.
we pulled the cover off the return so it was pulling straight from the main duct, not the flex dcut and within about 5 minutes the air temp came down 1 degree.
we did have the attic door down but then it was down the entire time we were on the roof.

the building I work in is opposite of that. the return pulls from above the drop ceiling and there is flex duct for the supply.