I had a 4 ton Carrier Infinity heat pump (2 speed with VS fan coil) installed (attic) two months ago. Just turned on the AC two weeks ago. The system is qreat - cools well, even temperature throughout house, and is quiet (except on high). Checking the system through the stat, I noticed that static pressures were higher than I expected based on general information I have picked up on this site.
882 CFM -- 0.35
1400 CFM --0.97
1600 CFM --1.19
The system typically operates in the 800 to 1400 CFM range and only goes to the highest speed when there is a >2°F difference in actual and demand temperatures. The installer says these readings are normal. Also, the stat called for filter cleaning after only 1 week of operation. I cleaned it even though it looks brand new. After 1 more week it is calling for cleaning again. No faults are reported. Any thoughts?