re: Could we technically create our own icebergs?

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But it seems to be pointless...

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Evaporative cooling works. Rooftop surface area is inefficient but evaporative cooling is a real thing.

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So you're going to stand outside in the hot sun and power water on your roof to cool the house that you're not occupying?

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I didn't say it was practical, just that it works.

You can do the same thing on your condensing coils outside on your A/C system and improve the efficiency. Just have to make sure the costs of water is not too expensive.