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Title: Junk!
Review: I tried to save some money by changing out our old thermostats. Going cheap on the thermostats was a mistake. This thermostat uses the old method of bimetallic material to switch on and off. It was poorly calibrated and when the room was 70 it needed to be turned past 85 to work. They would get stuck on and create all sorts of problems with the room temperature. I returned these chinese made hazards and purchased ones that use a chemical cell to detect temperature. The electronic ones are + or - 1 degree. These units are + or - 20 degrees and get stuck on. Forget them. We returned them. Round two on the install!
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