What is the purpose of an HVAC thermostat?

The purpose of an HVAC thermostat is to control heating and cooling systems by regulating indoor temperature. It acts as a key component in the HVAC system, allowing users to set a desired temperature for their environment. When the actual temperature deviates from the setpoint, the thermostat detects this change and activates or deactivates the HVAC components (such as heaters or air conditioners) to maintain the desired temperature level. This operation ensures comfort for occupants while also optimizing energy use.

In contrast to the other choices, the thermostat does not provide electrical power to the HVAC units directly, nor does it automate the electrical supply to individual components. While some advanced thermostats may include air quality monitoring features, this is not its primary function; the main role remains focused on temperature regulation.