VAV Boxes HVACHVAC (Heating, Ventilation, and Air Conditioning) are mechanical devices used to regulate air temperature in an indoor environment. These boxes are typically connected to a duct system and function by controlling the airflow of conditioned air throughout a building. This provides efficient and consistent heating and cooling while maintaining a constant temperature throughout the space. VAV boxes offer energy savings by providing individualized control of each room, allowing you to set different temperatures in different areas depending on need. They also provide improved air quality by eliminating odors, dust particles, and other airborne contaminants.