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