Re: Heatwave
Yes, I would wonder whether tin foil could reflect and focus light in such a way as to melt or set something else on fire though? They happened with a curved shaped skyscraper (the Walkie Talkie) in London which melted a car.
Also make sure the tin foil isn't going to dazzle drivers if the window faces a road. I thought about doing it but my room faces a road with a blind bend in it so I'm not sure if it would be safe. You can alternatively use cardboard which wouldn't be as effective as it will absorb rather than reflect the heat but should still help.
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