A feature of a Variable Air Volume (VAV) system is that it?

A Variable Air Volume (VAV) system is designed to adjust the volume of air delivered to different areas of a building based on the specific heating or cooling needs of that space, which often correlates with occupancy levels. This dynamic adjustment allows the system to respond to changes in occupancy and the resulting thermal load more effectively than other systems that provide a constant airflow.

By modulating airflow, VAV systems can improve comfort, enhance energy efficiency, and reduce operational costs. When a room is occupied, the system increases airflow to maintain a desired temperature. Conversely, when the room is unoccupied, the airflow is reduced, which can lead to significant energy savings.

In contrast, options discussing maintaining constant airflow or operating independently of temperature do not accurately describe VAV systems, as they are inherently designed to vary airflow based on real-time conditions, including temperature and occupancy. Additionally, the notion of varying air volume solely based on humidity does not align with the primary function of a VAV system, which is predominantly reliant on the thermal loads driven by occupancy rather than humidity levels alone.