Best portable air conditioner for the 2026 Europe heatwave

🗓 Updated July 21, 2026 · EcoBack editorial team

The 2026 heatwave has pushed portable air conditioners into shortage across Germany, France and Spain. Prices swing daily and popular models sell out. This guide cuts through it: what to actually look for, and the fastest no-installation options you can order right now.

Why the rush: about 23% of German households now own an air conditioner — up five percentage points in a single year — and 69% of them use a portable monobloc unit (Verivox, 2026). Germany's national weather service (DWD) puts the odds of a too-warm summer 2026 at roughly 81%, which is why mobile units sell out fastest during each heat spike.

Do you need a real AC, or will a cheaper cooler do?

Only a portable/monobloc air conditioner actually lowers the temperature — it compresses refrigerant and vents hot air out a window. Air coolers and fans just move air. If you need to sleep in a hot bedroom, get a real portable AC. If you just want relief on a budget, a fan or air cooler is fine and far cheaper.

Match BTU to your room size

BTU is the cooling power. Too little and it won't keep up; too much wastes money. Rough guide:

• Up to 15 m² (small bedroom): ~7,000–9,000 BTU
• 15–25 m² (bedroom / office): ~9,000–12,000 BTU
• 25–35 m² (living room): ~12,000–14,000 BTU
• Open-plan / larger: 14,000+ BTU or a monobloc unit

Don't ignore the window kit

Every portable AC needs to vent hot air out a window via a hose and a seal kit (included with most). If you have tilt-and-turn windows (common in Germany/Austria), check that the kit fits — see our guide to using a portable air conditioner with tilt-and-turn windows. Without venting, a portable AC won't cool at all.

What about a big or open-plan room?

A single small portable can't keep up with an open-plan space. Step up to a higher-BTU mobile / monobloc AC unit and check the m² rating before buying.

Budget alternative if you're renting

Can't vent a window or don't want to spend €250+? An evaporative air cooler (from ~€60) or a tower fan (from ~€30) needs zero installation and gives real relief, especially in drier heat.

Bottom line

For genuine cooling with no installer and no weeks-long wait, a 9,000–12,000 BTU portable air conditioner is the sweet spot for most European bedrooms. Buy for your room size, check the window kit, and don't overpay for BTU you won't use.

Frequently asked questions

What is the best portable air conditioner for a bedroom?
For most European bedrooms a 9,000-12,000 BTU portable air conditioner is the sweet spot — enough to cool 15-25 m2 without wasting power. Popular, well-reviewed lines include the De'Longhi Pinguino for all-round use and Comfee for value. Match the BTU to your room size and check the window seal kit fits.

What size portable AC do I need for a small room?
For a small room up to about 15 m2, roughly 7,000-9,000 BTU is enough. Going much bigger wastes money on power you won't use; too small and it never keeps up. For a 15-25 m2 bedroom or office, step up to 9,000-12,000 BTU.

Do portable air conditioners work in European apartments?
Yes. A monobloc portable AC needs no installer and no permanent changes, which suits rented flats. The one thing to check is venting: the exhaust hose must reach a window, and if you have tilt-and-turn windows (common in Germany and Austria) you need a seal kit that fits them.