Can I replace 4 wire thermostat with a 2 wire thermostat?

Looking to hook up a 2 wire heat only thermostat as the door with the weiring diagram is missing its a goodman guso50-2?

We bought a Honeywell thermostat with four wires and our current Mears model has 3 wires colored black, red, and white. The wires on the Honeywell model are 2 red and 2 black. How, if possible, can we use this thermostat with the current wiring?

I currently have two zones for cooling only and the thermostat wires are red, blue and white. The red is labeled Rc which is easy, the white is labeled W Heat (this doesn't make sense to me) and the blue is labeled cool? What I think I need to do is connect the red to the Rc on the thermostat,...

I currently have a Magic Chef Model 34154C001 thermostat for an electrical heating and cooling system. This model has 6 wires included: W - White R - Red G - Green Y - Yellow O - Orange C - Black I purchased a Honeywell RTH230B programmable thermostat that only has 5 connections. The...

I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking. When taking the old thermostat off, I noticed 4 of the 5 wires were labelled. That's a good thing. HOWEVER, when I took the old baseplate off, 2 of the labels fell off (not sure from...