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It is one of freebeards often posted pictures: a VW with one hanging off the side window of an aircooled VW.
They work when the relative humidity can allow the incomming air to evaporate quickly (hence the name) and in a desert can drop the air 20 degrees. Don't work well in Chicago or many places East of the Mississippi
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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