We have a Bryant Evolution system. Its only about a year and a half old. Was installed by the homebuilder. About 2 days ago it I noticed the reading on it said "cooling at 42" and we can not manually change the temp. to cool back up to 73 degrees. The up button for the temp. will not work to...

This is about hvac units: how is a transformer connected to get power and then give power to the thermostat And where is the transformer excactly - lets say on a residential a/c unit with gas furnace

I have a bryant thermostat that when I set it to 75 it kicks off at 70 and the aux heat comes on and the temperature starts dropping and it gets very cold in here. I don't have a manual to know how to program to stay at 75 or to kick in when it drops below. I hope you can help me I put it on hold...

I have a digital thermostat bryant and the screen went blank how do I fix it its for a air conditioner

My Honeywell Chronotherm III thermostat is set on heat and it blows hot for a while then the LCD says "HEAT - AC" and it starts to blow cold. Then it goes back to blowing hot then back to cold, etc. the thermostat clicks continuously as this happens. Help