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In my country it's quite common to see commercial trucks resorting to a swamp cooler instead of a proper air conditioner. Even though such swamp coolers are also resorting to water as a coolant, which allows them to run a comparatively smaller fan, most likely a large fan would still require fewer power to run than the compressor of an air conditioner. BTW maybe you could be tempted to try making your own all-electric air-cycle air conditioner, more similar to the one fitted to aircraft than to the regular vapour-cycle ones...
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