Live in subsidized housing, treated me like Im a dummy. Air conditioning set on 75, goes up to 78 or 79 and runs and runs for hours. Sometimes it runs till it freezes up. Was told it was normal and functioned just fine and if its so hot its not suppose to cool below 80 very well. housing unit is only 3 years old with central unit outside and is plenty big enough. I would not recommend them, I have worked as a helper in the heating and air business and if I seen a newer complex and the air ran for over an hour to lower the temp one degree from 77 to 78 and its only 88 outside I WOULD SAY THERES A PROBLEM somewhere. My guess is the thermostat because is says 77 but my thermometer says 74 or lower in the house.......BUT IM stupid and no one listens to me.