Comment by wat10000

When something has been known for millennia and hasn’t been put to a particular use even after decades where it could have been used, that is pretty good evidence that this use isn’t a good idea. Especially when it’s something really simple.

Radiative cooling is great for achieving temperature a bit below ambient at night when you don’t have any modern refrigeration equipment. That’s about all. It’s used in space applications because it’s literally the only option.