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Does this video just describe UV coating glass with extra steps?
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No.
I understand that it's a cofusing video. The 'now with ray-tracing' animations are unhelpful. Start here:
en.wikipedia.org/wiki/Infrared_window
aerohead and I engaged on this in the absorption AC thread from
Permalink #11 to #25. In preparing this response I learned that there are
three atmospheric windows. IR is the one in question, between 8 and 14 μm.
aerohead's objection was that there are more gases than CO2 and water vapor. Turns out that ozone is third most impoortant.
Anyways, to answer your question, no -- not just glass.
Ultrawhite paint with [IIRC] barium phospate pigment works; and there is SkyCool.
www.skycoolsystems.com/technology/ and their Dual-mode Film. Seven alternating layers of sputtered coatings IIRC.