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With the recent changes in hot biomes, the problem of mitigating heat and cooling off in a hot environment has become more relevant. Historically, dry hot climates have employed evaporative coolers for this purpose. These simple devices employ the ability of water to absorb thermal energy when it evaporates to cool the buildings (simple air conditioning) or storage vessels (crude refrigeration).
For example, a zeer (or "pot-in-pot refrigerator") is made by placing a clay pot inside a larger clay pot, separated by a layer of wet sand. As the water surrounding the inner pot evaporates through the porous walls of the outer pot, the inner pot becomes colder. This can be used to keep perishable foods fresh longer in a dry, hot environment.
https://en.wikipedia.org/wiki/Pot-in-pot_refrigerator
A similar concept is used to cool entire rooms or buildings - a reservoir of water is allowed to evaporate in such a way as to produce cooler air in the desired area. Various designs have been used for a large chunk of human history and they can be constructed from materials as basic as pottery, cloth and water. Many parts of the world continue to employ evaporative cooling methods today.
https://en.wikipedia.org/wiki/Evaporative_cooler
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Any chance we could replace unfinished snowmen with some swamp coolers?
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