I just got 2 new HVAC systems installed (upstairs and downstairs), and
I noticed during the day, the downstairs unit doesn't want to hold the
temperature. The other day, I had it set for 78, and it crept up to
82 (starting around 3PM), and didn't get back below 80 until 10PM.
Now it's hot here in Atlanta for the past few days, but these are new
units (2.0 ton downstairs and 2.5 upstairs). The upstairs unit seems
to maintain the temperature without a problem.
Today I set both units at 75 (cooler than usual - just a test to see
if they hold). The upstairs is still 75, the downstairs is 78.
Also, in the evenings (with the downstairs unit constantly running) I
sometimes feel a little warm (not terrible) sitting in the den, but
then feel a burst of cool air (like the unit just clicked on).
Any ideas what could be going on? Could the weather (97 outside right
now) be the culprit? (Though my upstairs maintains without a problem)
Or the thermostat? Or bad unit?
The installer says he is going to try some "expansion valve" at the
coils - does this make sense to anyone?