Under a new state law, thermostats containing mercury can be returned to the manufacturer via local wholesalers for recycling. Old thermostats are apparently a significant source of mercury in the waste stream. More information is here (apparently you can take your old thermostat to a dealer).
Maine homeowners can now receive a $5 payment by recycling any old mercury thermostat, which cannot legally be disposed in household trash.
Under a program initiated under a new Maine law, thermostat manufacturers will provide pre-paid UPS mailing labels to any homeowner who requests them. The mailing labels allow consumers to ship thermostats to be recycled. In return, the manufacturer provides a payment of $5 for each thermostat received.