Recently bought a house. It has forced hot air and I want to replace my old honeywell stat with a new honeywell stat. the wire has four colors red,black,yellow and green. I've never seen anything like this before. Usually the wire has 3 or 5. so I thought it was going to work, but the stat has only...

I recently installed a used central AC unit in my garage that a friend gave me. After trying unsuccessfully to install the thermostat (I couldn't figure out where the 3 wires went) I bought a new Honeywell ct31 manual thermostat at Walmart figuring that I would be getting a schematic or wiring...

I have 5 wires coming out of the wall: blue, yellow, red, white, and green. My thermostat only has 2 wires: red and black. How do I wire them to make my Central Air work?

Is there a special thermostat for an electric furnace with A/C/. Don't you Want the blower to come on as soon as the electric heat is energized? In other words the same time.

Hi all, great site! My problem is that we only have 3 wires coming up to our thermostat. We are installing central air and I was wondering if it is possible to wire the thermostat with only 3 wires?? Thanks :D