Home › Guides › AC vs fan vs cooler

Portable air conditioner vs fan vs air cooler: what actually cools a UK room?

They look similar and the prices overlap, but only one of these actually lowers the temperature. Here is the honest difference.

When it is 32°C in your bedroom, three very different products get marketed as the answer: fans, evaporative "air coolers," and portable air conditioners. They cost anywhere from £20 to £600, and the marketing blurs the lines on purpose. Here is what each one really does.

Fans — move air, don't cool it

A fan doesn't lower the temperature of a room by a single degree. It moves air over your skin, which speeds up sweat evaporation and feels cooler — but the thermometer doesn't budge. That's fine when it's mildly warm. In a real heatwave, a fan is just pushing hot air around, and on the hottest nights it can actually feel worse. Cheap (£20–60), quiet options exist, zero installation. Good as a supplement, not a solution above ~28°C.

Evaporative air coolers — a small drop, in the right conditions

An "air cooler" (or "swamp cooler") blows air over a wet pad, and the water evaporating pulls a little heat out of the air. In a dry climate this works well. In the humid UK, the effect is modest — a few degrees at best, and it adds moisture to the room, which can make things feel muggier. They're cheaper than AC (£60–150) and need no window venting, but don't expect air-conditioning results. Honest summary: better than a fan, well short of an AC, and fighting against British humidity.

Portable air conditioners — actually drop the temperature

A portable AC is a real refrigeration unit: it removes heat from the room and pumps it outside through a window hose. It genuinely lowers the temperature, often by 8–10°C, regardless of humidity (it dehumidifies too). The trade-offs: it's the most expensive option (£250–600), it needs a window for the exhaust hose, and it's the heaviest and loudest of the three — though good inverter models (e.g. the Meaco Cirro range) are bearable to sleep next to. This is the only one of the three that will make a hot UK room genuinely comfortable.

Which should you buy?

• Just need a breeze on warm days? A fan. Cheap and fine.
• Tight budget, no window to vent, dry-ish room? An air cooler — manage expectations.
• Want a hot room to actually become comfortable? A portable air conditioner. Nothing else does this in the UK.

The catch with the third option is the one this whole site exists for: the good portable ACs sell out within hours of a heatwave. If you've decided an AC is what you need, the move is to know which model and get an alert for when it's back in stock — rather than panic-buying an overpriced air cooler because it's the only thing left on the shelf.

Figures are approximate and change with energy prices, stock and season. This guide contains affiliate links — we may earn a small commission at no cost to you, and it never affects what we recommend.