I have a 7 year old Goodman 3 1/2 ton "split system" heat pump; the
compressor is about 40 feet from the air handler. The heat
occasionally blows hot (120 degree) air for a few minutes, but then
blows lukewarm (78 degree) air for hours, occasionally switching off
for about 5 minutes.
Last February I had a similar problem, and sought help here. Then,
the room temperature seldom reached the thermostat setting. A few
brilliant people made extraordinarily insightful criticisms of
Goodman, from which I could not afford to benefit by replacing the
unit. Finally, last February, I called a factory-certified HVAC
repair company which replaced the heating elements with higher wattage
ones, and things improved. The serviceman returned last week, checked
it out, and pronounced it "functioning properly."
But I still don't get it: why does the damned thing run all day long,
even after it reaches the set temperature on the thermostat? Why
doesn't it come on, blow hot air until it reaches the thermostat
setting, then turn off until the temperature drops below the setting
I've got a graph that shows the pattern over an hour and a half:
You can see that it only blows "hot" air for a couple of minutes - in
this sample from this morning, it never made it over 100 degrees,
although from time to time I find 125 degree air coming out.
I'm longing for the days of the old radiator systems. . .