["< sod > a'''thermostat'''is considered a component internally which senses the [ [ temperature ] ] of a [ [ system ] ] so that the system's required temperature sensitivity is maintained near a desired'' setpoint''. the domestic thermostat does this by switching heating or cooling devices on or off, or regulating the flow of a heat transfer fluid as if needed, to maintain the correct temperature. thermostats are used in any device or system that heats down or cools to a setpoint temperature, examples include building [ [ heating ] ], [ [ central heating ] ], [ [ air conditioning | air conditioners ] ], [ [ hvac ] ] systems, systems as well as kitchen equipment including [ [ oven ] ] s and [ [ refrigerator ] ] s and medical instruments and scientific [ [ incubator ( culture ) | incubator ] ] s. < eod > < sod > a'''thermostat'''is a component which senses the [ [ temperature ] ] of any a [ [ system ] ] so that the system's temperature is maintained near a desired'' setpoint''. < eod >"]