katero
Jun 23, 2026

I tried kitchen foil on my windows to see if it really keeps your house cool

I tried kitchen tin foil on my windows to see if it really keeps house cool in heatwaves

It's been called a hot tip but does foil across your windows actually work? I tried it to find the answer.

Share Article Facebook X LinkedIn Reddit Bluesky Email Copy Link Link copied Add as a preferred source on Google Add us as preferred source Comments By Alex Evans, Deputy Audience Editor 13:53, Mon, Jun 22, 2026 Updated: 13:53, Mon, Jun 22, 2026

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My home office with tin foil over the windows (Image: Alex Evans)

40C. I can't even remember the last time the UK was forecast 40C heat. But this week it feels like we are yet again hurtling into unprecedented territory with more heat records set to be broken.

As journalists we see - and write - a lot of different advice for weeks like this and with the way things are going with the climate crisis, the frequency and strength of these heatwaves is only going to increase. As a country, we're still relatively inexperienced with this kind of heat. Should you have your windows open? Should you have your curtains closed? Should you be drinking alcohol or not? How long is it safe to stay outside? What shouldn't you do while driving in a heatwave? And so on - there's no shortage of expert advice out there and thankfully it's usually genuinely helpful stuff to get us through these sweaty days and sweltering nights.

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One piece of advice which caught my eye was about tin foil. We all know it can be placed behind radiators in the winter to help warm a room up, but according to some expert advice I bumped into online from people used to living in hotter climes than we're used to here in the UK, tin foil/kitchen foil/aluminium can also be used to keep your house cool in a heatwave.

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The temperatue inside my dining room (Image: Alex Evans)

The idea of the foil is that, rather than have the sun glaring through your glass window, heating the room like a greenhouse effect, the shiny, reflective foil not only stops the sun coming in (like a curtain) but actually bounces the light back away again without absorbing it (unlike a curtain). It also has a melting point of 660C apparently, so it isn't going to leave me with toxic melting metal as it reflects the heat away. At least, that's the theory.

So I sent that advice out there but then I thought, let's go one better: let's test it out, and I did so here in the midst of a heatwave in 2022. It shows how rapid climate change is happening, because that was July and two years later, we're experiencing the same temperatures in May.

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