Evaporative cooler

An evaporative cooler is a device that cools air through the evaporation of water. Evaporative cooling differs from other air conditioning systems, which use vapor-compression or absorption refrigeration cycles. Evaporative cooling exploits the fact that water will absorb a relatively large amount of heat in order to evaporate.

The temperature of dry air can be dropped significantly through the phase transition of liquid water to water vapor (evaporation).
This can cool air using much less energy than refrigeration.
In extremely dry climates, evaporative cooling of air has the added benefit of conditioning the air with more moisture for the comfort of building occupants.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 4.0

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