A thermostat is a temperature-sensitive switch that turns heating and cooling systems on and off in your home when the temperature reaches a preset limit. Operation can range from simple manual units to sophisticated programmable units that provide enhanced functionality and highly efficient operation. Programmable thermostats adjust the temperature automatically throughout the day, saving you as much as 33% on heating costs and up to 15 to 25% on cooling. Advanced models can switch back and forth between heating and air conditioning during seasonal transitions. They have an easy-to-operate digital interface, and newer models are mercury free.

Programmable thermostats allow you to set different temperatures at different times of the day, providing the appropriate level of comfort while you are home and adjusting to a set-back, or energy-saving temperature, when you’re away or asleep. Programmable thermostats are also equipped with controls that allow you to manually override the program’s schedule as needed.