Mitsubishi Electric MSZ-LN

The MSZ-LN, sold under Mitsubishi Electric's Kirigamine name, is the brand's premium wall-mounted split and one of the quietest air conditioners you can fit in a UK home. The indoor unit drops to 19 dB(A) in its lowest setting, quiet enough to sleep beside, and the 2.5 and 3.5 kW models reach A+++ in both cooling and heating. It is the unit to pick when silent bedroom running and a designer finish matter more than saving money on the box.

It is not cheap, and that is the main catch. You pay a clear premium over a plain white split such as Mitsubishi's own Elegance or a Daikin Perfera for what is, underneath the fascia, similar cooling. Efficiency also steps down on the larger sizes: the 5.0 kW keeps an A+++ cooling label (SEER 8.5) but drops to A++ in heating, and the 6.1 kW is A++, so the headline figures belong to the smaller units. For a bedroom or a mid-sized living room where quiet and finish count, it earns the premium; for a big open-plan space chosen on running cost alone, a plainer unit gets you most of the way for less.

The MSZ-LN is the flagship of Mitsubishi Electric's home wall-mounted range, sold under the Kirigamine name (Mitsubishi Electric is a separate company from Mitsubishi Heavy Industries, which makes its own wall splits). Like any wall split it pairs one indoor unit with an outdoor condenser, or runs as part of a multi-split system serving several rooms, and it heats as well as cools through the year. What lifts it above a standard split is the mix of near-silent running, top efficiency on the smaller sizes and a proper designer fascia in four finishes rather than the usual white plastic box. For the wider picture, including how big a unit you need, see our wall-mounted air conditioners guide.

It comes in four cooling sizes, 2.5, 3.5, 5.0 and 6.1 kW, covering rooms from a small bedroom up to a large living room or open-plan space. Its natural home is a bedroom or a well-used living room where quiet matters and the unit is on show. If you are cooling a big room purely on running cost, or you will tuck the unit out of sight, the money spent on the LN's quiet running and finish is harder to justify, and a plainer split will do much of the same job for less.

The MSZ-LN is a fitted product, so the meaningful figure is supplied and installed, not the box price. A straightforward single-room install of the 2.5 or 3.5 kW model starts from around £2,000, including the unit, pipework, labour, commissioning and F-Gas certification (the refrigerant work on a fixed split must be done by an F-Gas registered engineer by law). Costco UK's installed MSZ-LN 3.5 kW Premium package was £2,249.99 for members in October 2026, with a 5-year parts warranty. The larger 5.0 and 6.1 kW sizes, longer pipe runs or a multi-split setup push that up to roughly £2,800 to £3,500 or more. Unit-only, the indoor and outdoor pair sits from about £1,500. Treat every figure as indicative and work from a proper fixed quote after a site survey.

Running costs are low for its class thanks to the high efficiency. On the 2.5 kW model's A+++ figures, cooling a bedroom across a summer costs only a few pounds, and because the LN is a reverse-cycle heat pump (it runs in reverse to heat as well as cool) it can take over some winter heating at a SCOP of 5.2, turning roughly one unit of electricity into five of heat. At the October 2026 Ofgem price cap unit rate of 26.32p/kWh, that efficiency is what keeps the bills down. If the LN replaces an existing fossil fuel or electric heating system (gas, oil, LPG, storage or panel heaters) and is fitted by an MCS-certified installer, it may qualify for the £2,500 Boiler Upgrade Scheme grant for air-to-air heat pumps in England and Wales; comfort cooling added alongside a gas boiler does not, and it is separate from the larger £7,500 air-to-water grant. Prices correct as of July 2026; electricity rates updated for the October to December 2026 price cap. The energy price cap changes quarterly, so check current rates before budgeting.