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At first I thought he/she was going with a home-made swamp cooler, which would probably be more effective given the amount of water he's using . . . but then I saw the copper tube. LOL . . . that's pretty creative.
Necessity is the mother of invention. :-)
Let me guess... he makes the ice in his refrigerator, which is inside the house, which means all the heat pumped out of the water PLUS the waste heat from the refrigeration system gets pumped into the house. Then, a fan and pump add more heat to the inside of the house while it locally cools the one room, and spoils the flooring where the condensate drips from the uncontained copper coils. Bottom line, a net INCREASE of heat inside, at a tremendous electricity cost to boot!
As far as air conditioners, they are about 50% cheaper this year than last I've noticed. Do NOT buy the cheapest! Pay attention to the EER- energy efficiency ratio (BTU/Watt)- and pay extra for the most efficient unit you can buy. The SAVINGS is in the ongoing ELECTRICITY consumption. Kind of like choosing the cheapest printer, without noticing the price of toner cartriges.