The single zone, constant air volume system is most similar to what?

The single zone, constant air volume (CAV) system is most similar to rooftop unit systems because both are designed to deliver a consistent volume of conditioned air to a single space or zone. In a CAV system, the air volume remains constant while the temperature may be adjusted, which aligns with the operation of rooftop units that typically provide a constant airflow to a single area such as a commercial space, office, or retail environment.

Rooftop units often include a packaged heating and cooling system, making them suitable for a variety of applications where a single zone is served with conditioned air. This design simplifies control and maintenance, as all components are integrated within the unit located on the roof, allowing for efficient operation in a single zone context.

In contrast, split system air conditioners, ductless systems, and heat pump systems may serve multiple zones or provide variable air volume, which distinguishes them from the consistent output characteristic of single zone, constant air volume systems. Understanding these distinctions helps one appreciate the operational context and application for each type of system.