Paint Keeps Heat Away

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SolCold, a company based in Herzliya, Israel, has developed a novel way of cooling buildings that uses absolutely no electricity. The innovation comes in the form of a coating that can be painted on buildings’ roofs, which is then activated by the sun. According to co-founder Yaron Shenhav, “It’s like putting a layer of ice on your rooftop which is thicker when there is more sun.”
The product works by taking principles of laser cooling and applying them to the sun’s spectrum. “Heat from a building could be absorbed and re-emitted as light,”  Shenhav says. “As long as the sun is shining on it, it would be continuously cooled.”
Paint That Cools When Exposed to Sunlight Could Help Us on Earth and in Space [Futurism]

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