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Air conditioning - Wikipedia

Air conditioning (often referred to as AC, A/C, or air con) is the process of removing heat and moisture from the interior of an occupied space, to improve the comfort of occupants.

en.wikipedia.org/wiki/Air_conditioner

Packaged terminal air conditioner - Wikipedia

A Packaged Terminal Air Conditioner (often abbreviated PTAC) is a type of self-contained heating and air conditioning system commonly found in hotels, motels, senior housing facilities, hospitals, condominiums, apartment buildings, add-on rooms & sunrooms.

en.wikipedia.org/wiki/Packaged_terminal_air...