These thermostats are suitable for use with furnaces and hydronic heating systems (boilers) in which the house also has central air conditioning. This would include oil and gas-fired systems, forced hot air, steam heating systems, and forced hot water systems. To install you will need to have available a Philips head and/or flat head screwdriver. If you are not confident in your ability to install a programmable thermostat, consult with a qualified HVAC company.
Using a programmable thermostat can lower a household's energy expenses by about $100 annually. Those thermostats that are ENERGY STAR qualified contain no mercury and will offer maximum programming flexibility. See the ENERGY STAR Programmable Fact Sheet (pdf) for more information.
