HVAC actuators are mechanical devices that are used to control the flow of air in a heating, ventilation, and air conditioning (HVAC) system. They are responsible for regulating the temperature, humidity, and air pressure in a building. HVAC actuators are typically powered by either electricity or pneumatics. They are used to open and close dampers, valves, and other components in the HVAC system. HVAC actuators are also used to adjust the speed of fans and other components in the system. By controlling the flow of air, HVAC actuators help to maintain the desired temperature and humidity levels in a building. They are also used to regulate the air pressure in the building, which helps to ensure that the air is properly circulated throughout the building. HVAC actuators are essential components of any HVAC system, and they are used to maintain a comfortable and safe environment for occupants.