He just had it put in so hasn't run in cooling, no old system - electric heat before.
Originally posted by fat eddy
I just caught the part about two 10" supplies this defies any air flow chart ever made for a normal residential static pressure ? unfortunately or maybe fortunately the centrifugal blower in your furnace will peak out on its curve without moving the sufficeint air. You should have noticed in the cooling season that your suction line may have froze. You have to find a way to get the proper trunk connected to this thing. Is this furnace a lot louder than the previous one ?