Search for home air conditioning units online and you'll drown in spec sheets. As installers, we see how these machines actually behave two, five and ten years after fitting — in bedrooms in Swindon, garden offices outside Salisbury and conservatories in Trowbridge. Here's the honest version of which units we'd put in our own homes, and why.
Raw cooling power matters far less here than it does in Spain. For a UK home the things that count are:
The benchmark. Whisper-quiet indoor units (down to around 19dB), superb build quality and the best long-term reliability record we see. The 7-year warranty through approved installers is the strongest in the business. You pay a premium, but it's the brand we recommend when someone says "just fit the best one".
Right alongside Mitsubishi at the top table, with arguably the best heating performance of any domestic brand — its units hold their output impressively well in cold snaps. The Onecta app is genuinely good rather than an afterthought. A superb choice if winter heating is the main reason you're buying.
The value sweet spot. Noticeably cheaper than the top two, yet solidly built with a strong warranty and respectable noise figures. If the budget doesn't stretch to Mitsubishi or Daikin, Toshiba is where we'd point most people rather than dropping to an unknown brand.
The workhorse. Fujitsu units are unglamorous, dependable and well priced, and they cope well with the temperature swings you get in conservatories and garden rooms — which is exactly where we fit a lot of them. Not the quietest on the list, but rarely the one that calls us back.
The interesting one. Samsung's WindFree indoor units cool through thousands of micro-holes rather than blasting a draught at you, which people either love or don't notice — but nobody complains about it. Stylish units, decent app, sensible pricing. A good shout for living rooms where the unit is on show.
The design pick. The Artcool range — including the mirror-finish and gallery-style units — is the best-looking kit on the market, and LG's dual inverter compressors are efficient and quiet. If the thought of a white plastic box on the lounge wall has been putting you off, LG is the answer.
| Brand | Typical indoor noise* | Warranty (approved installer) | Best for |
|---|---|---|---|
| Mitsubishi Electric | From ~19dB | Up to 7 years | Bedrooms, "fit the best" buyers |
| Daikin | From ~19–20dB | Up to 7 years | Heating-led homes, app lovers |
| Toshiba | From ~20–22dB | Up to 7 years | Best value without gambling |
| Fujitsu | From ~21–23dB | Up to 5–7 years | Conservatories, garden rooms |
| Samsung | From ~21dB | Up to 5–7 years | Draught-free cooling, style |
| LG | From ~19–21dB | Up to 5–7 years | Design-conscious living rooms |
*Lowest fan speed on typical domestic wall-mounted models; exact figures vary by model and capacity.
Cooling more than one room? See our guide to split vs multi-split systems before you decide.
Here's the part the spec sheets won't tell you: a mid-range unit sized correctly, installed neatly and commissioned properly will outperform and outlast a premium unit installed badly. Wrong sizing, sloppy pipework or skipped commissioning cause far more problems than any brand's factory ever does — and they void the very warranties that make the top brands worth buying. Whatever unit you choose, choose the person fitting it just as carefully. Typical installed prices for each system type are in our installation cost guide.
Tell us the room, the town and what matters most to you — silence, looks, budget or heating performance — and send us a message. We'll recommend a specific unit and give you a fixed supplied-and-fitted price, anywhere in Wiltshire from Chippenham to Salisbury.
Mitsubishi Electric's wall-mounted range is the usual benchmark, with indoor units running as low as around 19dB on their quietest setting — quieter than a whisper. Daikin and Toshiba are close behind. For bedrooms, ask your installer for the indoor sound level at low fan speed, not just the headline figure.
Mitsubishi Electric and Daikin have the strongest long-term reliability records in UK domestic use, and both back that with warranties of up to 7 years through approved installers. That said, a mid-range unit installed and serviced properly will usually outlast a premium unit installed badly.
Some are reasonable machines, but there are two catches. Refrigerant connection work must legally be done by an F-Gas certified engineer, so you can't legally self-install a split system anyway. And most manufacturers void the warranty if the unit isn't installed and commissioned by an approved professional — so the saving often evaporates the first time something goes wrong.
Tell us the room and what matters most — quiet, looks, budget or heating — and our local team will recommend a specific unit with a fixed installed price.
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