Thanks for the response. Yes, I would set the temp to say 76 and it would get to the point where it is definitely cooler than 76 and the fan speed would slow down but the temp of the air would continue blowing very cold air and I would not hear the compressor kick off. Because the fans slow down when set at automatic temp, I'm guessing the control unit knows the temperature. Since it is obviously engaged, I would try to listen for the compressor, change in revs, or any indication the compressor is disengaging, but I can't sense any at all.