page_title: Automobile air conditioning
section_title: Evaporative cooling
hierarchical_section_title: Automobile air conditioning / History / Evaporative cooling
caption_attribution_description: English: 1949 Hudson Commodore 8, a full-sized four-door sedan featuring Hudson's step-down design that allowed it to be lower than contemporary cars, as well as better handling because of a lower center of gravity. It has Hudson's 254.4 cu in (4.2 L) straight 8 engine. This car also has an aftermarket external window mounted "Kool Air" (branded) unit. This is an evaporative cooling system, also known as a "desert cooler" because it worked best in dry conditions. Air is forced through a water saturated pad to cool the car's interior. This design is also known as "swamp cooler" because it only added humidity to the passing air. Picture taken at the 52nd Annual "Das Awkscht Fescht" antique car show in Macungie, Pennsylvania.
context_page_description: Automobile air conditioning systems use air conditioning to cool the air in a vehicle.
context_section_description: A car cooler is an automobile evaporative cooler, sometimes referred to as a swamp cooler. Most are aftermarket relatively inexpensive accessories consisting of an external window-mounted metal cylinder without moving parts, but internal under dashboard or center floor units with an electric fan are available. It was an early type of automobile air conditioner and is not used in modern cars relying on refrigerative systems to cool the interior.
  To cool the air it used latent heat (in other words, cooling by water evaporation). Water inside the device evaporates and in the process transfers heat from the surrounding air. The cool moisture-laden air is then directed to the inside of the car. The evaporate "cooling" effect decreases with humidity because the air is already saturated with water. Therefore, the lower the humidity, such as in dry desert regions, the better the system works. Car coolers were popular, especially among summer tourists visiting or crossing the southwestern United States states of California, Arizona, Texas, New Mexico, and Nevada.
caption: A car cooler
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