Depending on how humid it is where you are you might check in to a evaporative cooler (a.k.a swamp cooler). They can use water more efficiently to cool the air than a grey water system.
Water can hold a lot of heat but it also needs a place to give up that heat. There have been ideas before about using a pool to cool the house and at the same time heat the pool water which are both benefitial. However a decent sized pool holds thousands of gallons of water.
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