Central, forced-air system; fuel fire furnaces with air conditioning units. The best system for each home depends on the cost and efficiency of the equipment, annual energy use, and the local price and availability of energy sources.
See also:
Air Handler & Blower Unit troubleshooting & repair for Air Conditioners / Heat Pumps Air Handlers, Blowers, Fans, Coils
https://inspectapedia.com/aircond/Air_Handler_Unit.php
Further reading:
Heating Ventilation Air Conditioning
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