What does the term "zoning" refer to in HVAC systems?

The term "zoning" in HVAC systems refers to dividing a building into distinct areas, or zones, that can be heated or cooled independently. This allows for greater control over the temperature in different parts of a building based on individual needs or preferences. For instance, one zone might be a living area that requires a different temperature from a bedroom zone.

By utilizing zoning, HVAC systems can improve energy efficiency as they reduce unnecessary heating or cooling in unoccupied spaces, optimizing overall comfort and energy consumption. This system often involves the use of multiple thermostats and dampers in the ductwork that can open or close to direct airflow selectively to the designated zones.

The other choices do not accurately capture the concept of zoning. Adjusting thermostat settings manually pertains to general control rather than zoning. Regulating airflow through a single duct again does not reflect the independent control aspect of zoning. Removing old air from the system is more associated with ventilation rather than the independent heating or cooling setup that zoning describes.