I have a Coleman Furnace with a AC unit. I am trying to change out my old wore out Thermostat, I bought a York model #2th07701024 thermostat. I have two wires coming from the furnace because there is a switch on the unit that controls the heat and ac. I know to hook the red wire to the RC terminal on the new thermostat and the white wire to the W terminal. It has a red jumper wire from the RH to RC terminal and a yellow wire to a Y terminal. The instruction talk about a single transformer to move the yellow wire from terminal Y to A. How do I know if I have a single transformer. How do I hook this up to a two wire system.
If this is a line voltage setup then you can't use that thermostat. It will fry on the spot. If you only have 2 wires going to the thermostat they go to RH and RC. That's all you need to worry about.
So have you fixed the problem that you were having? I see that many people have problems with the remote for their coleman furnace. Have you ever thought of switching to a designer radiator instead? There are friends who told me those are great for heating and they do not take up so much space, and some designs look great!