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This guide covers how to cool a bedroom in a heatwave, roughly in order of cost. Start with the free habits: keep curtains or blinds closed during the day. Then block the daytime sun, get the air moving, drop the humidity, and only then consider kit that actually cools the air.
- Start with the free steps: curtains or blinds closed during the day.
- Block the daytime sun.
- Get the air moving with a fan.
- Lower the humidity.
- Only a portable air conditioner actually cools the air.
A bedroom gets hot because the house soaks up heat all day. Keep the curtains closed in the daytime and open the windows when it cools down outside. Try a fan before spending money on an air conditioner.
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A hot bedroom is the worst part of a UK heatwave. The house has spent all day soaking up heat, and a British bedroom is not built to let it back out. The good news is you do not need to spend much to fix it. Here is what actually works, roughly in order of cost, from free habits to the kit worth buying. If you want the temperature to aim for, see our guide to how hot is too hot to sleep.
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Start with the free stuff
Before you buy anything, get the basics right. Keep curtains or blinds closed during the day, especially on south and west-facing windows, so the sun is not heating the room while you are out. At night, open windows on opposite sides of the home to pull cooler air through, and leave internal doors open so it can move. Switch off anything that throws out heat, including lamps and gadgets left on standby, and swap heavy bedding for cotton or linen.
Block the daytime sun
If one room bakes every afternoon, the cheapest lasting fix is stopping the sun getting in. Blackout blinds or even a reflective panel in the window keep a surprising amount of heat out, and they help you sleep through bright summer mornings too.
Get the air moving
A fan is the cheapest thing that genuinely helps, and it costs about 1 to 2 pence an hour to run. At night, point it out of an open window to push the hot air out of the room. For the best UK models, see our guide to the best fans for 2026, and for cooling away from the bedroom there are neck fans.
Drop the humidity
Sometimes a room is not just hot, it is sticky, and that is what makes it hard to sleep. Pulling moisture out of the air with a dehumidifier makes a warm room feel more bearable, and it earns its keep again in winter against condensation.
When you need to actually cool the air
If the room overheats no matter what you do, a portable air conditioner is the only thing on this list that lowers the actual temperature. It is the priciest option to buy and run, so it is worth understanding how well they really work in UK homes first, then picking from the best portable air conditioners.
Common questions
Does putting ice in front of a fan work?
A bit. A bowl of ice sat in the airflow chills the breeze for a while, but it melts fast and will not cool a whole room. Treat it as a short-term trick, not a fix.
Should I open the windows during the day in a heatwave?
Only if it is genuinely cooler outside than in. On the hottest days, keep windows and curtains shut while the sun is up to keep heat out, then open everything at night once the outside air drops.
What is the cheapest way to cool a bedroom?
A fan, used well, plus the free habits. Closing blinds by day and opening opposite windows at night costs nothing and makes a real difference before you spend on anything.
Do I actually need air conditioning?
Most UK bedrooms get by with a good fan and the free tricks. A portable air conditioner earns its place if your room overheats badly, you work from home in it, or you sleep poorly in the heat.
The fans and portable air con we'd buy
How Look Into made this guide: desk research, not a hands-on test. We shortlist on UK availability, compare published specifications and warranty terms, and read verified UK owner reviews, discounting incentivised ratings. Prices in the comparison table are pulled live from Amazon UK. Look Into has not handled these products: every figure comes from the maker, the listing or a named source, read on the date shown.
As an Amazon Associate, Look Into earns from qualifying purchases. Product prices and availability are accurate as of 15 November 2026 9:03 am and are subject to change.
This page is part of Look Into's UK household cost research. The measured research behind this cluster is the UK Overheating Bedrooms Report.
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