Common plastics could passively cool and heat buildings with the seasons

https://engineering.princeton.edu/news/2024/06/27/common-plastics-could-passively-cool-and-heat-buildings-seasons

"restricting radiant heat flows between buildings/ environment to specific wavelengths, coatings from common materials achieve energy savings, thermal comfort... radiant heat moves from roofs to sky in narrow portion of IR... ground level walls/ windows radiant heat moves across entire IR... so use applicable coatings for orientation/ season...common/ low-cost building materials radiate heat in narrow IR, block heat for entire IR, such as polyvinyl fluoride, already used as siding, and polypropylene, sourced from household plastics"

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