Portable air conditioners in Europe: the heatwave purchase, examined
Every European heatwave sells out the continent’s portable ACs in days — Germany and the UK, the least air-conditioned big markets, lead the panic-buying. The physics deserves a clear-eyed look before the checkout: a single-duct portable exhausts indoor air outdoors, pulling warm air in through every gap, and its EU energy label (EER classes for single/double duct units) sits far below any split’s — typical single-duct EER around 2.6 against 4–5 for fixed equipment. Cooling achieved per euro of electricity is roughly half.
Used within its limits, it still earns its place in un-air-conditioned Europe: renters who cannot touch the façade, protected buildings, two hot weeks a year. Extract the most from it — a proper window sealing kit (the zip-up fabric kits transform performance), the shortest straightest duct possible, shutters or external blinds against direct sun, and run it early rather than chasing a 35 °C room at 6 pm. For anything beyond occasional duty, our split guide shows why fixed equipment wins on every metric but the landlord’s permission.
Frequently asked questions
Why is my portable AC struggling in a heatwave?
Single-duct infiltration: the exhausted air is replaced by 35 °C outdoor air seeping in, so net cooling can halve exactly when you need it most. Sealing the window opening around the duct, insulating the hose and closing shutters recovers a real share of the loss.
Are portable ACs allowed in rented flats?
Generally yes — that is their core European market. They need no installation or landlord consent, only a window for the duct. Noise clauses in house rules can apply at night (they run 55–65 dB), and windows blocked by DIY boards may breach fire-escape rules in some countries; the fabric sealing kits avoid both issues.
By country
Ownership, rules and heat history for 27 European countries; EU framework in the label and F-gas guides.