I checked the Freon pressure (good). I checked temperature at the unit in the attic ( return 78.8 - supply 51.6) I checked the temperature coming out of the grills (range from 53.7 to 61.8) The return grill is a little small for that unit. (Recommendation to 24x24) and relocate to the ceiling. The thermostat was not reading the same temperature as my tester. (May need to be replaced) I also recommend tenting the windows in the family room.