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My Honeywell thermostat just broke. I want to get a new one and install it myself but I don't know whether to get a 24V model or a 120-240v model. There is no indication of this on the one I have. How do I tell?

  • I'd poke about with a suitably rated multimeter. – RedGrittyBrick Feb 24 '15 at 10:34
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How thick are the wires connected to the thermostat?

24V wiring will be small gauge, usually 22-18 AWG. It's commonly used for forced air, hot water, and similar systems.

120/240V thermostats will typically use 14-10 AWG, and are commonly used for electric baseboard heaters.

  • Also if you have baseboard electric heat it will be 120/240v and if you have a forced warm air system it will be 24v. – Mnc123 Feb 24 '15 at 1:48
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    @Mnc123 That's what I said. – Tester101 Feb 24 '15 at 2:03

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