Her unit just uses tap water, and so do most of the larger versions that are used in commercial and industrial applications. The interesting part is that it often takes a surprising amount of water to generate electricity, so chances are high that the overall water usage is much lower than for a conventional A/C. (Technically, the water isn't truly "used", since it just goes into the atmosphere to fall back as rain.)
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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