Hello I am having trouble with installing a new thermostat. I have an electric air and heat unit. I purchased a honeywell that matched. The only problem is that my wiring, which is aluminum has only 3 wires and the honeywell shows 5 wire connection. What do I need to do?

I have been having some issues with the heater lately. First off I have a heat pump with backup gas furnace, and a/c. It seems that the fan continually runs. It also seems that the heat pump never runs even though I have the thermostat set to “heat” not “emer heat”. Also the fan seems to run...

I just purchased a Honeywell ct87758A,C to replace an old round, manual Honeywell unit. The old one was taken off without labeling the wires. There is a white, red and gray one. Any idea which one goes with which letter? It only controls the cooling system.

I am trying to install a new digital thermostat to an existing RUDD system. The original RUDD thermostat is currently installed. How do I find out how to install the thermstat? The wiring diagrams do not match the wires I have installed. And how do I find out what type of system I have for air...