Proper Disposal of Mercury-Containing Thermostats

Exposure to high levels of mercury can damage the brain, kidneys, lung, heart and immune system in people of all ages, says the Environmental Protection Agency (EPA). The severity and nature of the effects depends, among other factors, on the chemical form of mercury as well as the amount involved and the length of exposure.

Mercury can be found in many commercial and consumer products. When a mercury-containing product breaks and the chemical is released, the substance can evaporate and turn into an odorless, invisible vapor. In order to prevent accidental mercury spills, certain products need to be used and stored safely. When the products reach the end of their useful lives, they also need to be disposed of safely.

Mercury switches, the EPA says, are used in some thermostats. In particular, temperature control devices may contain tilt switches, where the chemical is stored in one or more glass bulbs inside the thermostat. The tilt-switch, which is sensitive to temperature, helps to control the flow of electricity to cooling and heating systems, including central air conditioners. Tilt switches are also used in other household appliances such as space heaters, televisions, the lids of washing machines and portable freezers. Their purpose is to function as on/off switches: When the tube tilts to one side, the mercury flows to either end, which interrupts the circuit on one end while opening it on another.

So long as the tilt switch on your home cooling/heating system is not broken, there is no imminent spill risk, says the EPA. However, these products should be properly disposed of at household hazardous waste collection centers. All it usually takes is a call to your local or state collection program to inquire about items accepted and the proper methods for giving them to the center.

Have more questions about air conditioner safety? Contact AC World today!