Hi all. My mother has had me going up into her attic to seal the leaky ducts and parts of the plenum/air handler that join up to the furnace and coil units. Anyhow the return box and the other box that has the ducts coming out of it are made of sheet metal. It gets really hot up there in the summer and all that thin sheet metal doesn't seem like it helps when cooling the air, yanno? So I was wondering if its ok to take some polyiso boards, cut them to size the best I can and simply cover up some of that sheet metal. I am no AC expert but this seems smart to me. I am sure it doesn't help to have cool air warmed up by the sheet metal in that hot attic. The ducts are insulated just in case anyone was wondering.
Handyman, painter, wood floor refinisher, property maintenance in Tulsa, OK