This thermostat is made by the same co(RVP) that makes coleman mach III rv air conditioners. While it is true that the AC requires 120V - this thermostat operates on 12V and will also control any single stage furnace. I have a MachIII AC and the older non digital, non remote thermostat in my Arctic Fox. It controls both the furnace (DC) and the AC (AC) all from one unit. This thermostat is simply a digital unit with a remote that doubles as a remote thermostat. There are also thermostats that have several remote sensors so you can have up to 4 zones to base the indoor temp on.
07 Chevy 2500HD 6.0L ,6 speed auto, 4x4, Blue Granite Metalic
05 Arctic Fox 22H