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Best 12000 BTU air conditioner

Updated: 21 October 2026

You want one name for a stated room, and UK best 12,000 BTU lists keep naming Meaco, De'Longhi and Pro Breeze. None of those is in this comparison. On the [12000 BTU air conditioner comparison](/hub/cooling/12000-btu-air-conditioner) the top pick is the Midea PortaSplit if you can site its outdoor section, and the best value is the Air Pro AP-E4 if you want a reviewed hose portable and you will not sleep next to it. This page picks among the six amazon.co.uk listings and says who should skip each one. Peter F. compared the listings on 20 October 2026. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.

You want one name for a stated room, and UK best 12,000 BTU lists keep naming Meaco, De'Longhi and Pro Breeze. None of those is in this comparison.

Our top picks

Generic Generic 12000 BTU wall split

Best overall

Generic Generic 12000 BTU wall split
5.8/10about £659.99
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Midea Midea PortaSplit 12000 BTU

Rank 2

Midea Midea PortaSplit 12000 BTU
8.4/10about £1,099.99
View offer
Air Pro Air Pro AP-E4 12000 BTU

Best value

Air Pro Air Pro AP-E4 12000 BTU
8.0/10about £499.99
View offer
On this page
  1. 1.Best for a room you can put plant outside
  2. 2.Best value among the monoblocs
  3. 3.The wall split is hardware, not a winner
  4. 4.Listings that are too thin to crown

Best for a room you can put plant outside

The top pick is the Midea PortaSplit at £1,099.99, 4.3 from 23 amazon.co.uk reviews. Reviewers who had a single-hose unit say the lounge cools better because the heat leaves the room. Midea's UK page lists 3.5 kW, SEER 6.1, R32, about 45 kg and 39 dB(A) silent-mode pressure. Sound power is 59 dB, so that figure is not full cooling. The specification says no outdoor unit is required, yet reviews describe a separate section and stacking. At 45.5 kg it is not a daily carry. One remote arrived dead, and one review cites a £39.99 app subscription. Skip it if the window cannot take the line, if you must move it every day, or if £1,100 is the wrong budget. A 42 m² claim and a £13-a-season line are not your room or your bill.

Best value among the monoblocs

The best value is the Air Pro AP-E4 at £499.99, the only hose portable here with refrigerant, weight, wattage and reviews you can read: R290, class A, 1,025 W, 26 kg, a window kit and 3.8 from 20 reviews. Buyers in a heatwave say a medium room can get very cold. Skip it for sleep. The noise field is 65 dB, and reviews call it too loud at night, including a bang when the compressor stops. Water from the case is a repeated fault, and one hose was too short. If the bedroom is the point, read the bedroom noise page before you treat 65 dB as a night mode.
Generic Generic 12000 BTU wall split

Testsieger

Generic Generic 12000 BTU wall split
5.8/10about £659.99
View offer

The wall split is hardware, not a winner

The generic wall split at £659.99 is 5.0 from three ratings, too small a sample to beat 23 or 20 reviews. The price is the hardware, and fitted bands often run into the thousands, which the portable versus split page keeps separate. The weight field is 10 kg for a pair, and the 23 dB field has no test method. Buy it only if an F-gas qualified installer is booked.

Listings that are too thin to crown

A lower shelf price without a specification is not a third prize. The XIUNYIE at £456.24 has one review, and wattage, refrigerant and weight are missing. The QINLIGAO at £319.99 has no review line, and no outdoor unit still means a 1.5 m hose. The listing at £498.92 costs about the same as the Air Pro and disagrees with itself on capacity. None of those three is a bargain until the missing fields appear.

Common questions

Which unit is the top pick, and who should skip it?
The top pick is the Midea PortaSplit at £1,099.99, 4.3 from 23 reviews, if you can place the outdoor section and leave it there. Skip it if you must carry 45.5 kg between floors, if the window cannot take the line, or if the budget stops well below £1,100. The 39 dB(A) figure is silent-mode pressure, not a promise that the outdoor section is silent for neighbours.
Is the Air Pro the best value or just the cheapest complete spec?
It is the best value because the spec and the reviews are both there, at £499.99 and 3.8 from 20. The QINLIGAO is cheaper at £319.99 and does not publish refrigerant, wattage, weight or a review line. You are paying to see class A, R290, 26 kg and 1,025 W, and you are also accepting 65 dB, leak reports and a short hose.
Should you buy the generic wall split because it is 5.0 stars?
Not on the stars alone. The line is 5.0 from three ratings, and one review mentions missing parts before an engineer visit. The £659.99 does not include that labour. Energy class prints both A++ and A+++, and 10 kg is not a credible weight for a complete pair. It is hardware if you already have an installer.
Is the £319.99 QINLIGAO a bargain?
It is the lowest shelf price, and the listing is incomplete. There is no review line, no refrigerant, no wattage and no weight. The bullets still say you fit a 1.5 m exhaust hose, so no outdoor unit does not mean no vent. Until those fields appear, £319.99 is not a saving against the Air Pro's 26 kg and 1,025 W.
Can one model be best for a bedroom and a lounge?
Not in this set. The Midea is the overnight candidate only if the outdoor section has a place and you accept silent-mode numbers rather than a bedroom test. The Air Pro reviews say it is too loud for sleep even when the cooling is praised. A lounge you can leave is a different job from a room you sleep in. Meaco and De'Longhi are not in this comparison, so this page does not rank them.

Related pages

12000 BTU air conditioner buying guide

12000 BTU air conditioner

Quiet 12000 BTU air conditioner for bedroom nights

How to vent a portable air conditioner on a UK window

Portable vs split air conditioner: which one to buy

Sources

Public UK sources from the research digest. amazon.co.uk prices, stars and review counts are the listing lines for these six products, captured on 19 October 2026. This is not a laboratory test.

  1. GOV.UK: bans on F-gas in new products and equipment (retrieved 20 October 2026)
  2. GOV.UK: qualifications required to work on equipment containing F gas (retrieved 20 October 2026)
  3. GOV.UK: selling F gas or equipment (retrieved 20 October 2026)
  4. legislation.gov.uk: England GPDO Class G (retrieved 20 October 2026)
  5. Planning Portal: planning permission to add air conditioning (retrieved 20 October 2026)
  6. Midea UK: PortaSplit air conditioner (retrieved 20 October 2026)
  7. Trusted Reviews: single versus dual hose air conditioners (retrieved 20 October 2026)
  8. AirConCompare: how to choose an air conditioner in the UK (retrieved 20 October 2026)