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- 4 Jun 2020
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Is foil on windows effective? Considering it for the bedroom, I have massive windows and it must be 40C+ in there by 9-10 in the morning, it's killing me
No. Look up 'Low E solar insulation tinting film'.
At least new builds also come with this as standard, but the advertised 'keeps your house cool in summer' part is a joke, it just prevents greenhouse temps.