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HVAC, the acronym referring to heating, ventilation, and air conditioning relate to all matters relative to heati It is very important to understand how your HVAC controls and parts operate in case of an emergency. While you're advised to call a expert for any repair needs, it's useful to have a fundamental understanding of the system in your home. ng and A/C. The A/C side of the system uses the evaporation of refrigerant in order to offer cooling. On the other side of things, the heating side counts on a heatpump or furnace to supply heating through the same system.