The best air conditioning for UK bedrooms

A bedroom AC has one job: get the room to a comfortable temperature before bed and hold it there silently. Noise matters more than raw cooling power; a unit you can hear at 2am is a unit you'll resent.

For most UK bedrooms, a 2.0–2.5 kW wall-mounted split is the right size. Smaller rooms (under 12 m²) can use a 1.5 kW. Anything bigger than 2.5 kW for a normal double bedroom is almost always oversized.

Look for an indoor unit rated 19–22 dB at the lowest fan speed. Below 25 dB is inaudible behind normal bedroom soundscape; above 30 dB will register as a noticeable hum.

Outdoor units matter too if the condenser sits near a window; yours or a neighbour's. 45–50 dB at 1 m is the realistic floor.

High on a wall, away from the bed head, blowing across the room rather than at the pillow. The pipe run should reach the outdoor unit in under 10 metres for efficiency.

Loft conversions are the hardest case: limited pipe routes, no eaves, and the worst overheating in the house. Often worth bringing the installer to site before committing.

Before installing a split system in a bedroom, try external shading on south- and west-facing windows and a night-purge habit. In many homes that's enough. If overheating persists despite both, AC is the correct answer; but the system will be smaller, quieter and cheaper after you've done the basics.