Service technician Larry Wilson was pleasant, adept and effective. He proceeded like a physician in diagnosing the problem, beginning with the heat pump, then the thermostat, and finally, the condenser, which was not working at all. He immediately found the culprit, the contactor switch. He replaced it and filled the freon up to recommended pressure. He communicated very clearly during the process of the repair. This was out first experience with Sig Cox and we won't be contacting any other HVAC company in the future. Sig Cox delivers superb service in a timely manner.