I have tempstar gas furnace/ac unit... I believe it is model NUGE060KG02 867.768011. We had a power outage at the beginning of July and when the power came back on after a week the a/c would not click on. Our neighbor replaced our thermostat (we were out of town) and this seemed to kick it back on for a week. But after a week the unit would not shut down even with the temp set higher. It just kept blowing lukewarm air. We finally turned it off, but now it will not turn back on this time. Any clues?