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Actually that last bit there seems to be more important to me than the actual tech here. So without this tech people are painting rooftops white. And I'm guessi

Actually that last bit there seems to be more important to me than the actual tech here. So without this tech people are painting rooftops white. And I'm guessing that's already like a 90% reflectivity? -- So there's really nothing to wait for if you want to cool your house. Just buy... exterior white paint. If you wanted to wait for this specific product, that's fine, but that's almost like waiting for 26% efficient solar panels instead of ~23% we already have (even though most production panels are 18% - 22%)... And actually this is also one of those things that also helps beat Tesla Solar roof - get a white paint - THEN add bifacial solar panels. So the Tesla roof panels is actually worse for your overall cooling than regular panels now.

adrian_b 5y ago
The whole point of the discussed paper and of their patent applications is that normal white paint is not good enough to cool something exposed to solar light. The white-painted object will heat less than when painted in another color, but it will heat anyway. The white paints described in the paper and in the patent applications, which use either barium sulfate or calcium carbonate instead of the normal titanium white pigment, actually cool the painted object, even in strong solar light.