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UK professor says smearing yogurt on your windows can cool your home

4 points by theanonymousone

by Tade0

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There's an interesting guide on how to make radiative cooling paint from common ingredients complete with an explanation why it works:
https://www.youtube.com/watch?v=KDRnEm-B3AI
The catch is that such paint is not particularly robust, much less weatherproof.
Beats yogurt I guess, which tends to smell as it turns in sunlight.
I have roof windows and was wondering how much I could gain from panels painted like that, but most likely as much as I would using the next best thing - a window sunshade, which I'm using already.

by nick238

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This is old (2025).
Fortune links to a BBC article, which doesn't really provide any more detail about the testing conditions. I wonder if rubbing a bar of soap on your windows would reflect light and be easier to wash off. Also, were the windows tested low-E or not?