In a scenario wherein the original thermostat wires may were stapled to an interior wall stud, and now not run via conduit, you may be higher off leaving the present set of wires, and cutting them off on the entry and go out points of the wall. Then feed new wires with a fish tape (klein tools). Check your local home development shops, or local device apartment, for condominium availability. When you have smooth access to the prevailing thermostat wires, just eliminate and comply with the identical route with the new set of wires. You can use cable ties, electrical tape, or staples (securing wires and cables article). Be sure to take a completely conservative size on how lengthy your new set of wires should be. You don’t need to begin over, in case you come up quick. Observe: a previous installer may additionally have used a different set of color wires. This will be a non issue to maintain song of if an entire new set of thermostat wires is pulled. In any other case tag the wires earlier than eliminating from the present thermostat, or take note of the terminals each twine is hooked up to.
Going into your furnace might also sound intimidating, but when you have the primary know-how of wiring, and recognise a way to do away with the right furnace panels to access the electronics, you then have to be exceptional. The com 24v terminal can be linked to the c (24 vac not unusual) of the thermostat.