An air handler HVACHVAC (Heating, Ventilation, and Air Conditioning) is a device used to condition and circulate air as part of a heating, ventilation, and air conditioning system. It is typically a large metal box containing a blower, heating or cooling elements, filter racks or chambers, sound attenuators, and dampers. Air handlers usually connect to a ductwork ventilation system that distributes the conditioned air through the building and returns it to the air handler. The air handler is usually connected to a central air conditioner, a heat pump, or some other form of HVAC equipment. The air handler’s job is to take the conditioned air from the HVAC system and distribute it throughout the building. It also returns the air back to the HVAC system to be reheated or cooled. Air handlers are also used to control the humidity and air quality in a building. They can be used to filter the air, remove dust, pollen, and other allergens, and control the temperature and humidity. Air handlers are an important part of any HVAC system and can help keep the air in a building clean and comfortable.