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The factory's fan & sponge arrangement is a
simple evaporative cooler, or swamp cooler - popular in the arid south US as a
poor mans AC unit. Requires a lot of water (on the order of a few gallons
per hour, if I remember correctly...) but is really really simple other than
that. Basically - blow air over a wet surface; the evaporation cools the
air, the air sinks, keeps your house cool. I've heard of people that just
harness the prevailing winds, if there is one, or maybve with some sorta vaning
wind scoop - no electric fans that way. Or just hang wet
blankets in the window...
Don't work so well where it's humid, though - then
the wet surface just mildews..
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