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In the broadest sense air conditioning can refer to any form of cooling, heating, ventilation or disinfection that modifies the condition of air, typically for thermal comfort.[1] The more common use of air conditioning is to mean cooling and often dehumidification of indoor air, typically via refrigeration.
An air conditioner (AC or A/C) is an appliance, system, or mechanism designed to extract heat from an area using a refrigeration cycle. The most common uses of modern air conditioners are for comfort cooling in buildings and transportation vehicles. More information on air conditioners can be found in that article; this article addresses air conditioning in general.

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