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Thermostats May Contain Mercury

Mercury thermostats use mercury tilt switches to sense and control room temperature through communication with heating, ventilating, and air conditioning (HVAC) equipment. A mercury thermostat may contain one or more switches, depending on how many heating and cooling systems it activates.

Mercury thermostats are unlikely to break or leak mercury while is use, but they need to be properly disposed of when being replaced. If a mercury thermostat is being replaced by a household occupant rather than by a heating and air conditioning professional, the old thermostat should be recycled. Please visit our Thermostat Recycling Web page for more information.


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