Recently bought my first house. Has an older waterfurnace versatec 3 ton unit. Open loop system. The Ac worked great except for the leak or extreme condensation that resulted in water all over my basement floor. Tech couldnt find a leak anywhere. But as far as the heat. I am not sure what's up. The house is warm. But my electric bill went from $115/mnth with ac on to almost $300/mnth with heat on. I disabled aux heat and house dropped to 56deg. I have temp set at 70. The aux heat comes on a few times a day. Yesterday outside temp 30deg. Inside temp was 70. Set at 70. And system is running with aux heat on. Is it this stupid honeywell thermostat? Or what else could it be?