[freebeard]

Probably not easy to impl[e]ment yet, but scientists have discovered that just as colored paints reflect certain wavelengths of light and reflect others....

Not sure I follow, let's ask Wikipedia:

en.wikipedia.org/wiki/Atmospheric_window

An atmospheric window is a region of the electromagnetic spectrum that can pass through the atmosphere of Earth. The optical, infrared and radio windows comprise the three main atmospheric windows.[2] The windows provide direct channels for Earth's surface to receive electromagnetic energy from the Sun, and for thermal radiation from the surface to leave to space.[3] Atmospheric windows are useful for astronomy, remote sensing, telecommunications and other science and technology applications.

Out of an average 340 watts per square meter (W/m2) of solar irradiance at the top of the atmosphere, about 200 W/m2 reaches the surface via windows, mostly the optical and infrared. Also, out of about 340 W/m2 of reflected shortwave (105 W/m2) plus outgoing longwave radiation (235 W/m2), 80-100 W/m2 exits to space through the infrared window depending on cloudiness. About 40 W/m2 of this transmitted amount is emitted by the surface, while most of the remainder comes from lower regions of the atmosphere. In a complimentary manner, the infrared window also transmits to the surface a portion of down-welling thermal radiation that is emitted within colder upper regions of the atmosphere.[3]

Now let's ask Ecomodder: ecomodder.com/forum/showthread.php/energy-free-cooling-through-physics-40537.html#post693050

This Material Might Change How We Cool Our Houses Forever

Given the fabrication process it might be difficult to embody as a paint, but hypershift pearls suggest otherwise.