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Well … The answer to the question is already in the headline
anti clickbait
shrugs in blackout curtains
However, with your curtains, the sun (and heat) has entered your home. When it is extreme heat, you want to stop it on the outside of your house to avoid heating up inside.
Good point, maybe even use both?
It will also help, if not anything else, they can insulate further.
In places, where they have been getting extreme heat for a long time, they often have shutters for their windows to block out the sun.
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To beat the heat - here you go
Limewash for exterior surfaces can help a lot
