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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.
I'm Dutch and in a similar situation. There's these stick-on sun screens with suction cups: https://huizedop.nl/wp-content/uploads/2025/06/novalux-zonwering-met-zuignappen.jpg
Works wonders, can be made to size, they're relatively cheap. Hope it'll help.
I live in a rental on 4th floor, unfortunately I can't add anything to the outside of the windows... And putting anything on the inside risks trapping the heat in the glass and cracking it.
It's fine to put aluminium foil on the inside. Sunlight is reflected out without heating up the glass. That's what worked for me anyway.
As long as there is no space for air to get trapped between the glass and a reflector, it's no issue to put it on the inside (although its more effective when on the outside) - those foils that can be put on the window using a little bit of water do a good job. Biggest problem are dark objects when only away a few centimeters from the glass - those will crack the window in no time.
At least where i live, non-permanent modifications that use things like suction cups don't need approval from a landlord.