overgeeked
Open-World Sandbox
They work almost anywhere. They work better in arid climates.True, but AFAIK they work well in dry climates. Which means that there are large parts of the US where they aren't very effective.
Despite being nicknamed swamp coolers, they aren't great for swamps.
Put a fan in front of a bowl of cold water and drop some ice in the water. Works a treat. Or better yet, replace the ice with a couple of plastic bottles 1/2 filled with water then frozen.