Which of the following is a key function of a thermostat in HVAC systems?

The primary function of a thermostat in HVAC systems is to control temperature. A thermostat works by sensing the current temperature of the environment and comparing it to the desired setpoint temperature that has been input by the user. When the actual temperature deviates from the setpoint, the thermostat sends signals to the heating or cooling system to either turn on or off, or to adjust operation accordingly. This regulation helps maintain a comfortable indoor climate by managing how much heating or cooling is delivered.

Managing airflow, monitoring humidity, and filtering air may be functions associated with different components of the HVAC system. For instance, airflow regulation is primarily handled by fans and duct systems, while humidity control involves humidifiers and dehumidifiers. Air filtration is typically the responsibility of air filters located within the HVAC system. Therefore, the specific role of the thermostat centers around temperature regulation, making it a fundamental component for comfort and energy efficiency in heating and cooling operations.