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This video offers a nice explanation of a basic swamp cooler, also known as an evaporative cooler:
Here’s an example, using a swamp cooler to keep the temperature down in a rabbit barn:
The amount of cooling you get depends on the amount of humidity in the air. In very dry air (say in Phoenix) you can get a temperature drop of 30 degrees or so. In a humid place like Atlanta, the effect will not be as strong, but it is still noticeable.
It is interesting to note that large air conditioner systems (say at an office building or hospital) will often use a swamp cooler to make the air conditioner more efficient. See How Air Conditioners Work for details.
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