HVAC - Air Handlers, FurnacesHVAC (heating, ventilation, and air conditioning) air handlers and furnaces are mechanical systems that are used to control the temperature and air quality of a building or space. Air handlers, also known as air handling units, are central air conditioning systems that consist of a blower, heating and cooling elements, and a filter. They are used to circulate and condition the air in a building, and can be combined with other HVAC components, such as chillers or boilers, to create a complete HVAC system. Furnaces, on the other hand, are heating systems that use fuel, such as natural gas or oil, to generate heat. They are typically used in residential or commercial buildings to provide heat during cold weather. HVAC air handlers and furnaces are designed to operate efficiently and reliably, and are typically installed and maintained by trained professionals.