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This article is about cooling of air. For Heating, ventilation and air conditioning, see HVAC. For air conditioning systems in vehicles, see Automobile air conditioning. Air conditioning can be used in both domestic and commercial environments.

Air conditioners often use a fan to distribute the conditioned air to an occupied space such as a building or a car to improve thermal comfort and indoor air quality. In common usage, though, “air conditioning” refers to systems which cool air. Since prehistoric times, snow and ice were used for cooling. The business of harvesting ice during winter and storing for use in summer became popular towards the late 17th century. This practice was replaced by mechanical ice-making machines. The basic concept behind air conditioning is said to have been applied in ancient Egypt, where reeds were hung in windows and were moistened with trickling water.

The evaporation of water cooled the air blowing through the window. This process also made the air more humid, which can be beneficial in a dry desert climate. Tang Yulin describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. In the 17th century, the Dutch inventor Cornelis Drebbel demonstrated “Turning Summer into Winter” as an early form of modern air conditioning for James I of England by adding salt to water.