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To expand on Eric's answer, a swamp cooler uses the evaporation of water to cool the environment. It works because water turning from a liquid to a gas takes work, which is taken from the air as heat. However, swamp coolers use water, not ice. The energy required to turn 1kg of ice to water is 334kJ, while the energy required to turn 1kg of water to vapor ...


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Maybe if you live in the desert and use a swamp (evaporative) cooler. Most areas use an air conditioner to remove humidity, not add it. Adding more moisture will only make it feel hotter and muggier.


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