Remove the thermostat cover and look at the mercury bulb while turning the dial; the bulb should rotate as the dial is turned. The drop of mercury should move and make contact with the wire contacts as the temperature selector is turned up.
Keeping this in consideration, What states are mercury thermostats illegal?
There are 12 states where it is illegal to dispose of a mercury thermostat any other way than by recycling: California, Iowa, Illinois, Maine, Massachusetts, Minnesota, New York, New Hampshire, Oregon, Rhode Island, Pennsylvania, Vermont.
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