Dear Umbra, I recently visited Moab, Utah, and found that many people there use "swamp coolers" rather than conventional air-conditioning systems. Moab is in a near-desert environment and has frequent water-shortage problems. I'm wondering whether this swamp-cooler method of air-conditioning is really greener than the systems most of the rest of us use, and whether it is depleting the already low water supply in these Southwestern desert areas. How does it stack up cost-wise against other types of cooling systems? My AC broke down this spring, and if I am able to get enough money together by next summer, I'd …
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