A thermostat is a device for regulating the temperature of a system so that the system’s temperature is maintained near a desired setpoint temperature. The thermostat does this by switching heating or cooling devices on or off, or regulating the flow of a heat transfer fluid as needed, to maintain the correct temperature.
A thermostat may be a control unit for a heating or cooling system or a component part of a heater or air conditioner. Thermostats can be constructed in many ways and may use a variety of sensors to measure the temperature. The output of the sensor then controls the heating or cooling apparatus.
There are many different kinds of thermostats but they are all divided into two basic categories: Mechanical & Programmable.
On the average programmable thermostats can save you money on your utility bills by reducing your home heating and cooling costs ups to 25%. Programmable thermostats allow you to customize a schedule based on your comfort and needs.