When replacing an old thermostat, you what to make sure to check the voltage powering your unit ( 24v or 110v ). A quick way to tell is by looking at the wire attached to your thermostat- if it is a thin (commonly seen in doorbells or speakers) wire it is most likely 24v. If it is a thick wire hanger it is line voltage 110v. Make sure to never wire a 24v thermostat into a 110v wire or a 110v thermostat into a 24v wire.
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