My brother has a Lennox heat pump (sorry no Model or Serial #) about 10 years old, with a 3 ton condenser and a 4 to air handler. He asked a question as to why the temp in the winter coming out of the vents seems to modulate so much. He says it goes anywhere from 85* to 110* F. Seems to start out at higher temp and the more it runs, the lower the temp goes. I have not had a chance to look at it yet.
Any idea what might be going on with this system. He lives out of town but I will be over to see him next weekend.
Thanks for any help.