Background---I had a Bryant system installed in June 2009 in a 45 year old 1000 sq. ft. rent house that probably is poorly insulated:
2.5 ton Condenser 165ANA030
We had a pretty cool summer last year and I never heard of any problems, but it's hot this year
On the 100 deg. days the system struggles to keep below 80 deg. Had it serviced by the installer, who first cleaned condenser coil and claimed it was working properly. Wrong. 2nd visit has diagnosed a bad thermal expansion valve. The system always blows cool air out the registers (although it doesn't feel like much airflow to me), just not enough to keep the house cool in the hot hot weather. The renter has since told me that the system never did work real "good" in hot weather. The installer offered to replace the TXV for 3 hours labor. I'm wondering if that seems reasonable, given the problem. Is a bad TXV easy enough to diagnose if I have another tech come out??