A room thermostat is a device designed to maintain a comfortable indoor temperature by automatically controlling heating or cooling systems. It works by continuously measuring the room’s current temperature and comparing it to the desired setpoint set by the user. When the temperature falls below or rises above this setpoint, the thermostat signals the heating or cooling system to turn on or off accordingly. This ensures that the room remains at a consistent, comfortable temperature while also improving energy efficiency. Room thermostats can range from simple manual models to more advanced programmable and smart versions that allow for scheduling and remote control via smartphones or home automation systems.