this post was submitted on 28 Jun 2026
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Chapotraphouse
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In France they put something called Blanc de Meudon on windows which I've heard is good too. Will be trying it next time.
Wow, I might try this next time. It washes of in rain though, right? I've seen people tape thermal blankets (aluminum on plastic foil) to their Windows.
You can also use yoghurt - exactly the same principle, it's basically "casein paint". Hanging blankets on the outside of the window also cuts heat transfer through the window by ~90%.
https://www.instructables.com/Milky-window-makeshift-curtains/