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Cc @soul
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i'm pretty sure that decent insulation keeps homes cool in summer too.
Yes.
EDIT: I should probably specify this a bit better. A black painted wall with insulation in it will keep out heat better than a black painted wall without insulation. But then again, you'll probably have windows in that wall, and most of the heat inside will probably be generated by the light that came through those windows, which the insulation then traps.... so yeah. Depends on your ability to let out trapped heat in summer I guess.
Presumably so we can die of heat stroke in the summer instead?
Only half joking