What is a thermostat?

Hint: A thermostat is a "closed loop" control device since it tries to minimize the difference between the desired and measured temperatures. In some cases, such as in an automotive thermostat, a thermostat includes both the sensing and control action aspects of a controlled system. We will now learn in detail about thermostats.

Complete answer:
Now let us see what a thermostat really is: a thermostat is a device that detects temperature changes in order to keep the temperature of an enclosed space relatively constant. The thermostat creates signals, usually electrical, when the temperature exceeds or falls below the intended value in a system that includes relays, valves, switches, and other components.

To maintain the proper temperature, a thermostat switches heating or cooling devices on or off, or regulates the flow of a heat transfer fluid as needed. In applications ranging from ambient air management to automobile coolant control, a thermostat is frequently the primary control device for a heating or cooling system.

It is typically used to regulate the flow of fuel to a burner, electric current to a heating or cooling device, or heated or cooled gas or liquid into the region it serves. Some forms of fire-detection warning systems include a thermostat as a component.

Note: Do not get confused that thermostats which are programmable will save you cash. It is a wrong statement. Purchasing and installing a programmable thermostat in your house does not guarantee energy savings or a decreased heating expense.