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In my case, I still wanted to be able to SEE THROUGH the window. The space blanket material is actually NOT opaque - it's more like those mirrored sunglasses.
For an attic, maybe aluminum foil would work fine? It would be interesting for someone to test it and find out.
Maybe line half the attic with aluminum foil, and half without, and then use one of those fancy thermal cameras from below to see the difference!
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