Electrochromic Smart Window with Transparent–Opaque Switchable Radiative Cooling

This needs a lot more pictures for me to understand it. Sounds like a promising technology.

Related, not paywalled:

Dual‐Band Electrochromic Smart Window for Dynamic Switching Between Radiative Cooling and Solar Heating

https://www.researchgate.net/publication/391903413_Dual-Band...