We have a thermostat that we need to replace. Our system is I think pretty typical, the thermostat I think controls the furnace and fan, and I suppose the furnace relays controls for the air conditioner. The wiring of the thermostat just has one R wire (Rh) which has a jumper connecting it to Rc. (I'm no expert, but I think this is the situation.) Thermostats are battery powered, I don't see any black wires or C wires.
The instruction manual says to turn off the breaker for the furnace before replacing the thermostat. But it's more convenient for me to simply unplug the furnace. (Or, as the plug goes into a remote-operated switch, I can easily turn the furnace/fan system off or on with a remote.)
My question is, can I just do that, unplug/switch off the power to the furnace, or is there some other wiring powering the thermostat wires that I would need to go to the fuse box and turn it off from there?
Edit: I unplugged the furnace and installed the new thermostat and it worked out fine.