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If Europe has started experiencing over 40°C heatwaves frequently, then this planet really is fucked
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this post was submitted on 06 Jul 2026
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That’s not how insulation works
Yes because modern Scandinavian homes have huge uncovered well insulated windows to allow the sun in as a free radiator during winter. I calculated my living room window to be somewhere between 3000W-5000W worth of radiation. Due to the high insulation this doesn't dissipate during the night in a heatwave, so it doesn't matter if the outside temp is 18°
Why? Because housing regulations dictated it. No one expected 2018 levels of heatwaves to be the new norm (except all the experts).
My old apartment reached temps of 35° measured at midnight for weeks in the 2018 heatwave despite the outdoor temp not rising much above 30°. Morning temps where around 28° with all windows open. If the morning baseline was lower the night temps might have been possible to sleep in but the insulation kept temps high throughout.
Which of course is why you pull down the blinds to limit heating of surfaces inside during the day and let the insulation keep heat out.
Which is why you of course open windows during the night to cool things off when temps are lower.
it's not perfect, and helps less with high nighttime temps, but it makes the proper insulated home work with you and not against you as much as possible.
We have a massive south facing side filled with windows (and two double glass doors), covers about 80% of the living area, all blinds mounted inside. We still had 9°C lower temps inside compared to outside during the worst hours of the heat wave. Yes 28°C is still hot, but much better than the 37°C we had outside.