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What do the old type of furnace thermostats use for power?

Asked by evelyns_pet_zebra (12923points) October 14th, 2009

These are the round kind with the temperature marking dial inside them, and the drop of mercury enclosed in a glass tube inside. I think it has two wires going to it, and are either one of these wires hot, or are they simply connected to the furnace to read the temperature?

I’d like to replace it with a programmable thermostat, and those are digital and have a LCD readout. The thought of re-wiring anything in this old house sounds like a chore I’d rather pass up.

Any ideas?

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