A VAV unit, or Variable Air Volume unit, is a type of HVAC system that is designed to regulate the temperature of a building by controlling the amount of air that is circulated throughout the space. This type of system is ideal for buildings with varying occupancy levels, as it can be adjusted to meet the needs of the occupants. VAV units are comprised of several components, including a controller, a motor, a fan, and a damper. The controller is responsible for monitoring the temperature of the space and sending signals to the motor, which then adjusts the speed of the fan to increase or decrease the amount of air that is circulated. The damper is then used to regulate the amount of air that is allowed to enter the space. By using a VAV unit, building owners can ensure that their space is comfortable and energy efficient.