What is the definition of a regular thermostat? A regular thermostat is a device used to measure and maintain a desired temperature in a given space. It is typically used in residential and commercial buildings to control the temperature of the house, or the temperature of specific rooms and areas within the building. A regular thermostat works by sensing the temperature in the space and then activating a heating or cooling system to adjust the temperature. This adjustment is usually done through the use of a set point, which is the desired temperature. The thermostat is then able to compare the current temperature to the set point and activate the appropriate system to regulate the temperature accordingly. To ensure the desired temperature is reached, the thermostat can adjust the temperature in small increments, rather than making large, drastic changes to the temperature. A regular thermostat is a simple, yet effective way to ensure that a given space is comfortable and that its temperature remains consistent.