I have been reading on here that the normal temperature differential between the supply and discharge air on an a/c is 18-20 degrees. Is this measured in the hot part of the day or at night? On my new Lennox system the difference is 13 degrees in hot part of day and 18 degrees after sunset. It maintains temperature setpoint well (76) except when it gets 98-100 outside then it drifts up about 1 degree inside the house. Is this acceptable performance? Unit cycles on and off except for about 3-4 hours in afternoon then it runs continuosly. I live in Alabama where humidity and high temperatures are extreme. Ductwork is in the attic.
[Edited by bamamule on 07-12-2006 at 05:22 AM]