Thermostat Problems

Is it possible that a thermostat operates correct all the time except when it reaches the temperature that is set doesn't maintain that temperature?:D I noticed that actually that thermostat gives a signal to the furnace but furnace doesn't turn on but that happens only when thermostat needs to...

I don't know much about HVAC because I haven't had many problems till now. My thermostat (honeywell T8001C) display goes blank and the heat will not turn on. I've tried flipping the breakers in the garage. That won't work. Any ideas?

I'm having problems hooking up my new thermostat and need an expert to assist me. I've done a major bathroom remodeling by myself, but always seem to get stuck on electrical items. Changing the thermostat is no different. By the way, the thermostat works, I simply want to change it due to...

I have an old janitrol t-stat with 7-wire configuration y-g-r-o-w2-e-c I've purchased a hunter digital t-stat with a 5 wire configuration RC-RH-W-G-Y How do I get this thing to work? The old t-stat is as follow y-(yellow) g- (green) r(red) o( orange) w2- (white) E (brown) C- (blue) Help me...

My temperature keeps dropping at different times of the day, but esp. At night before 9pm And even though the number on the right says 69 the left side says 63-it does this a few different times during the day & I have to play with it to get the heat on again. I have a White Rodgers programmable...