With thermostat set at 74:
Temp at hallway return filter: 74
Temp at floor register: 59
The blower also makes a pulsating sound at a rate of once per second. Sounds like it is struggling?
There are jumpers on the control board and the contractor has previously set the cool blower to the max speed. I have 2ea 16x20 filters for a return filter area of 640sq in -- but there is very little suction when I change them.
I actually measured run times last nite:
Cooling for 22 min, off for 5 min.
Cooling for 16 min, off for 7 min.
Cooling for 16 min, off for 8 min.
Cooling for 17 min, off for 7 min.