Do You Need to Turn on the AC Button in Winter?

[NolanAnn]

You don't need to turn on the AC button in winter. The AC button is the switch for the air conditioning compressor. In summer, when using the air conditioning, you must turn on the AC button to activate the cold air. The warm air, however, simply utilizes the internal heat circulation of the car and does not require the air conditioning compressor to be activated. Therefore, to use the warm air, you only need to adjust the air conditioning controls without turning on the AC switch. The warm air comes from the heat generated by the engine during operation: after the engine's cooling system dissipates heat from the engine, a fan directs this heat into the car to create warm air. When the warm air is not in use, the fan stops, the heating vents close, and the dissipated heat is completely released into the atmosphere. Thus, the car's warm air is a form of waste heat recycling and does not consume additional fuel.