Before revision: Heating and/or cooling elements Air handlers may need to provide hot air, cold air, or both to change the supply air temperature, and humidity level depending on the location and the application.
After revision: Hot (Heat A.K.A Furnace) and/or cold (Air Conditioning) elements Air handlers may need to provide hot air, cold air, or both to change the supply air temperature, and humidity level depending on the location and the application.