An air conditioner - sometimes written as AC or A/C - is a system or appliance which is used to extract heat from an area by using a refridgeration cycle. The most popular uses for air conditioners are in cars and in buildings. There are many different types of air conditioning unit available - some are within the building itself, some will be attached to the building with ducts on the outside carrying away the hot air, and some will be freestanding units which can be wheeled around to where the air conditioner is needed.

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