What is the definition of a VAV unit HVAC? VAV stands for Variable Air Volume, and is a type of heating, ventilation, and air conditioning (HVAC) system. A VAV system is designed to provide efficient cooling and heating within a building or area, while also reducing energy costs. In a VAV system, air is distributed through a series of ducts to different rooms in a building. Each room has its own VAV unit, which is connected to the main HVAC system. The VAV unit helps to regulate the temperature in the room by controlling the airflow. The VAV unit is designed to adjust the airflow based on the temperature in the room and the amount of air needed. This helps to maintain a comfortable temperature in the room and to conserve energy. The VAV unit also helps to reduce the amount of noise from the HVAC system, as it eliminates the need for fans and large ducts. Overall, a VAV unit