I just had a brand new 3.5 ton Trane put in our Townhouse, XB14 and XR80. It replaced a 4.0 Carrier. My concern is this, as old and beat as the Carrier was, if I set it to 73 degrees regardless of the outside temp, it went to 73 degrees. This new unit runs all day and never get to 73 degrees only 75 degrees. Did I buy too small of tonage? is there something wrong with the balance of gas? Something the contractor may not be telling me? The A/C company owner said it is operating correctly, and that it is just too hot outside. Seem incorrect to me...Please help your input is much appreciated.

Steve - Tampa, Florida