The… … WikipediaĪir conditioner - noun a system that keeps air cool and dry An air conditioner (often referred to as AC) is a home appliance, system, or mechanism designed to dehumidify and extract heat from an area. A Unitary Air Conditioner is composed of one or more… … Energy termsĪir conditioner - For general aspects of air conditioning, see Air conditioning. A Room Air Conditioner is a unit designed for installation in the wall or window of a room to deliver conditioned air without ducts. 1) to run turn on an air conditioner 2) to turn off an air conditioner 3) a central room air conditioner 4) the air conditioner was on, was running * * * room air conditioner turn on an air conditioner was running a central the air… … Combinatory dictionaryĪir Conditioner - A device for conditioning air in an interior space. of Energy, Energy Information Administration s Energy Glossary … Energy termsĪir conditioner - n. Room air conditioner - Air conditioning units that typically fit into the window or wall and are designed to cool only one room.