Applied Air HVAC systems can provide makeup air, ventilation air, space heating, space cooling, or “green” cooling. Our product mix includes packaged dedicated outdoor air systems and ventilation equipment, direct gas fired, indirect gas fired, air turnover, and evaporative cooling systems. Applied Air is a manufacturer of Heating, Ventilating, and Air Conditioning (HVAC) equipment ideal for controlling the temperature and quality of the indoor air in any commercial or industrial building.