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Quietest portable air conditioners for bedrooms (UK)

A unit that cools brilliantly is useless if it keeps you awake. Here is how to read the noise figures and which models actually let you sleep.

For a living room, AC noise barely matters. For a bedroom, it's the whole game — a loud unit gets switched off at 2am and you're back to sweating. The problem is that every manufacturer quotes noise differently, so here's how to actually compare.

What the dB numbers mean

Portable ACs are usually quoted between about 45 dB and 65 dB. That range matters more than it looks, because decibels are logarithmic — every 10 dB is roughly a doubling of perceived loudness. For reference: 45 dB is a quiet library or soft rainfall; 55 dB is a normal conversation; 65 dB is a loud vacuum cleaner you would not sleep through.

• Under ~48 dB on its lowest/"sleep" setting — genuinely fine for a bedroom.
• 50–55 dB — tolerable for light sleepers with white-noise habits, irritating for others.
• 58 dB+ — a living-room unit, not a bedroom one.

Two cautions: the quoted figure is almost always the quietest mode, not full-cooling mode (which can be 5–10 dB louder), and a number measured a metre away in a lab is optimistic. Read the lowest-mode figure and add a little mental margin.

What makes a portable AC quiet

The big one is an inverter compressor. Cheaper "fixed-speed" units slam the compressor fully on and off to hold a temperature — each cycle is a noticeable clunk-and-roar. Inverter models vary the compressor speed, so once the room is cool they tick over quietly instead of cycling. Inverter units are also cheaper to run. If a bedroom is the priority, an inverter model is worth the premium almost every time.

The quiet picks in the UK

The Meaco Cirro range is the one most often recommended for bedrooms — it's inverter-driven and quoted around 45 dB in quiet mode, which is unusually low for a portable. The larger Cirro 14000 suits bigger bedrooms while staying in the same quiet family. Budget own-brand units (Blyss, Wessex and similar) cool fine but are typically fixed-speed and noticeably louder — acceptable for a spare room, less so for a light sleeper.

As with every good model, the quiet ones sell out first in a heatwave. If a Cirro is what you're after, set a stock alert so you're not forced onto a louder unit just because it's the only thing left.

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.