🗓 Updated July 9, 2026 · EcoBack editorial team
When your bedroom won't drop below 28°C, sleep becomes almost impossible. Most of Europe isn't built for heat, and installed AC is rare. Here are twelve things that genuinely help you sleep in a heatwave — starting with free tricks, then the cheap gear that makes the biggest difference.
The one number every purchase hangs on — it is already worked out below. Adjust the room size if it is off.
Compiled from public tests & customer reviews — not tested by us. Prices vary; check the current price on Amazon. Illustrations, not product photos. One thing first: without a sealed window every portable AC loses most of its effect — hot air gets pulled straight back in. Amazon.de ships to most EU countries, with site and checkout available in English.
De'Longhi Pinguino PAC EX105
Strong cooling, often in the test-winner line.
✓ Strong cooling, good efficiency
✕ Big & heavy
Comfee MPPH-09CRN7
Affordable for small bedrooms & offices — but clearly audible.
✓ Cheap, compact
✕ Clearly audible (~63 dB)
AEG ChillFlex Pro
Comfortable in the bedroom, well equipped.
✓ Very quiet, well equipped
✕ Higher price
De'Longhi PAC N90 ECO Silent
Monoblock test winner at Stiftung Warentest, silent mode, R290 refrigerant.
✓ Quietest monoblock in its group
✕ Pricier than the value pick
Klarstein Kraftwerk Smart 12K
Strongest cooling of its group in public comparisons.
✓ Strongest cooling of its group
✕ Audibly loud
It draws in warm room air, cools it and returns it — the waste heat leaves through the window hose. Real cooling, not just moving air around.
Free tricks (do these first)
- Close blinds and windows during the day. Keep the hot afternoon air and sun out; only open up once it's cooler outside than in (usually after midnight).
- Create a cross-breeze at night. Open windows on opposite sides of the flat to pull cooler night air through.
- Cool your pulse points. A cold, damp cloth on wrists, neck and ankles lowers how hot you feel fast.
- Take a lukewarm shower before bed — not cold, which makes your body generate heat afterward.
- Ditch the duvet; use a thin cotton sheet and swap synthetic bedding for breathable cotton or linen.
- Freeze a water bottle and place it by your feet, or a damp towel in the freezer for 20 minutes.
- Sleep low. Heat rises — a ground-floor room or even a mattress on the floor is cooler.
Cheap gear that makes the biggest difference
If the heat is going to last, a small purchase can turn a sleepless night into a bearable one.
- A quiet tower or pedestal fan (from ~€30) is the single best value. Moving air over your skin dramatically lowers how hot you feel. Point it across your bed, not directly at your face, and place a bowl of ice in front of it for a DIY cool breeze. See tower fans on Amazon.de →
- An evaporative air cooler (from ~€60) blows air chilled by evaporating water — great in dry heat, no window kit needed. See air coolers →
- A dehumidifier (from ~€120) if your room is muggy — dry air feels noticeably cooler and helps you drop off. See dehumidifiers →
When only real AC will do
If you're in a heat pocket where fans just aren't enough, a portable air conditioner is the only no-installation option that actually lowers the temperature. It's a bigger spend (~€250+) but it's the difference between sleeping and not. See our portable AC buying guide to pick the right size.
Find the right unit — honestly recommended
Specific models with a role, compiled from public reviews (not tested by us) — plus free calculators for the right size.
See the top picks →See also: an attic or top-floor bedroom →