What type of HVAC system uses air as its primary medium for heating and cooling?

An air-based system is designed specifically to utilize air as the main medium for both heating and cooling spaces. These systems typically include components like air handling units, ductwork, and blowers to circulate conditioned air throughout a building. The primary method of heat exchange in air-based systems often involves heat pumps or air conditioners, which are responsible for removing or adding heat to the air that is then distributed within the living or working environment.

In contrast, hydronic systems use water as the heating medium, delivering heat through pipes and radiators, whereas steam systems operate similarly but utilize steam instead of hot water. Geothermal systems harness the earth's thermal energy to heat and cool spaces and primarily involve water or refrigerants as mediums. Each of these alternatives is effective in various applications but does not primarily rely on air for transferring heat. This distinction highlights why an air-based system is specifically categorized under those that use air for the heating and cooling processes.