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In response to "isnt an evaporator cooler used in dry, not humid, areas? -- nm" by tRuMaN

Yup. But that takes advantage of the energy lost by the hot, dry air to evaporate the water with the end result being cooler more humid air

It takes energy to cause the phase shift (from liquid to vapor) of the water. So pass hot air over a pan of water and some of water evaporates. In that process energy is taken from the hot air so the air cools down

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