AB 2347 (PDF file, 152KB), signed into law on September 29, 2008, is known as the Mercury Thermostat Collection Act of 2008. The bill requires thermostat manufacturers to establish and maintain a take-back program for mercury-added thermostats. AB 2347 follows the mercury-added phase-out bill AB 1415 by targeting manufacturers which sold mercury-added thermostats before January 1, 2006.