A new law requires recycling thermostats that contain mercury. Starting this summer, manufacturers must recycle the thermostats at no cost to the consumer. This law is meant to prevent mercury from getting into the environment. According to the DEC, if you have a thermostat on your wall that is a little older, it may contain mercury. If the thermostat breaks, or if it is improperly disposed of, people run the risk of exposure. Under the new law, manufacturers must educate consumers, and establish a recycling system.