It’s possible to cool a ventilated building below outside temperatures using an uninsulated roof that sends heat to the sky day and night, while regularly changing indoor air for health. Radiative cooling materials work by reflecting sunlight like a mirror, and by emitting heat at a wavelength that passes through the Earth’s atmosphere directly into space. Used as coatings or panels on rooftops, they can help cool down buildings on hot, sunny days.
www.anthropocenemagazine.org/2023/10/passively-cooling-buildings-is-possible-even-with-covid-ventilation/