https://phys.org/news/2018-10-energy-saving-radiative-cooling-ready-real-world.html

"You could place these panels on the roof of a single-family home and satisfy its cooling requirements," said Dongliang Zhao, lead author of the study and a postdoctoral researcher in CU Boulder's Department of Mechanical Engineering.

The findings are described today in the journal Joule and take advantage of natural radiative cooling principles.