What is the definition of a temp thermostat? A temp thermostat is a device that is used to regulate the temperature of a space. It is most commonly used in air conditioning or heating systems, but it can also be used in other applications. The device works by comparing the current temperature to the desired temperature and then activating the heating or cooling system as needed to bring the space to the desired temperature. The temp thermostat is comprised of a sensor, a switch and a control. The sensor measures the temperature and sends the information to the switch, which then turns the heating or cooling system on or off. The control is the mechanism that sets the temperature and keeps it within an acceptable range. Temp thermostats are commonly used in homes, offices and other spaces to maintain a comfortable temperature for people to work and live in.