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A thermostat is a component of a control system which senses the temperature of a system so that the system's temperature is maintained near a desired setpoint. 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. The name is derived from the Greek words thermos "hot" and statos "a standing". 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. An air conditioning thermostat is a type of thermostat that controls the air in the house or building. The AC thermostat works by turning on or off the AC unit depending on the temperature in the building. Once the thermostat is set at a certain temperature, when the house cools to that temperature, the unit will turn off. The heater thermostat also works in the same way. The room thermostat senses the air and adjusts the heating system of that particular room accordingly. Once the room reaches the set temperature the central heating will be turned off. If the air temperature drops below the thermostat setting the heating will switch on.