I have a question for the experts. I have a 2 year old Goodman 3 ton system. New A-coil and new outside unit. The system works fine, but the temp at all the registers are about 60-62 degrees. The system runs all day and night long. The house never gets below 80 degrees. 1200 sq. ft. home. The head pressure was very high, 280 - 300 I think. Coils are clean, could it be that it is over charged? The installer said that it took a lot of freon.