RAC:

RAC

As their name implies, room air conditioners are designed to cool the single room (with accommodation: 1/3 to 3 tons). While often set through a window, they can also be set through the outer wall. These units are designed for free air in space. No air ducts used. Cold air can be directed on adjustable, decorative discharge grille on the front panel of the device. The most common type of room air conditioner provides cooling capacity. Models are also available with electric resistance heat or heat pump. Heat pump cooling system that might turn its cycle and move the heat from the outdoor air for internal air in the heating season. It acts as air conditioning; i.e., to move the heat from the air indoors, outdoors during the cooling season.

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RAC