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Wall air conditioner noise level

Updated: October 2026

You are shortlisting a wall-mounted split on amazon.co.uk, and the wall air conditioner noise level is printed as 22 dB, 27 dB, 27 dB(A), and 54 dB. Only one of those lines is described as the indoor unit. The others leave indoor and outdoor blank, or print dB(A) instead. Products Compared repeats the wording captured on 15 October 2026, without a lab measurement. A qualifying purchase can earn a commission at no extra cost to you. The wider shortlist is in the [wall air conditioner comparison](/hub/cooling/wall-air-conditioner).

You are shortlisting a wall-mounted split on amazon.co.uk, and the wall air conditioner noise level is printed as 22 dB, 27 dB, 27 dB(A), and 54 dB. Only one of those lines is described as the indoor unit.

Our top picks

Generic Generic 9000 BTU

Best overall

Generic Generic 9000 BTU
6.6/10about £599.99
View offer
Generic Generic HS18000

Preis-Tipp

Generic Generic HS18000
6.1/10about £599.99
View offer
Generic Generic 24000 BTU

Alternative

Generic Generic 24000 BTU
2.8/10about £799.95
View offer
On this page
  1. 1.The only figure labelled as the indoor unit
  2. 2.27 decibels with no indoor or outdoor label
  3. 3.27 dB(A), silent mode, and sleep mode
  4. 4.54 decibels, and no review that mentions noise

The only figure labelled as the indoor unit

The 9000 BTU listing B0H3B89V1W, at £599.99, is the only file that ties a noise figure to the indoor unit. The noise field reads 22 decibels, and a bullet names the indoor unit together with sleep mode, a timer, and display-off. Sleep mode has no second decibel, and the page prints no outdoor figure beside 22. The one review body, dated 21 August 2026, does not mention noise. Bedroom on the same listing is a room-type field, not a sound test. Eight fan speeds are a count of settings, so 22 decibels remains the only sound figure you can quote. A bare numerical sort would place 22 dB first only if every other line were the indoor unit too.

27 decibels with no indoor or outdoor label

B0H8Q2VCMK is the 18000 BTU listing at £599.99, and its noise field prints 27 decibels with indoor and outdoor both unstated. Moving the indoor-unit wording from the 22 dB file would add a label this page never printed. These files print no outdoor figure, so 22 and 27 are separate seller lines. There is no silent-mode line, so 27 decibels is the whole noise claim. Three reviews, dated 6 August, 19 August, and 8 September 2026, do not mention noise. Sleep mode is not named beside this field. Writing 27 dB indoors on a shortlist would be your addition.
Generic Generic 9000 BTU

Testsieger

Generic Generic 9000 BTU
6.6/10about £599.99
View offer

27 dB(A), silent mode, and sleep mode

B0H9F7BLX3 is the 24000 BTU/h listing at £799.95. The title and a bullet print 27 dB(A), and the noise field prints 27 decibels. The file never says those two strings are one reading, so they stay two printed forms. The 18000 BTU line never uses dB(A), so the abbreviation stays on this ASIN. Silent mode and sleep mode are named here, and neither name has its own decibel figure. Treating sleep mode as 22 dB would join this copy to the other listing. Four fan speeds are a setting count, not four sound levels. The captured line is 1.0 from one rating with no review body.

54 decibels, and no review that mentions noise

B0HCX2TBQX is the 12000 BTU listing at £500.00, and the noise field reads 54 decibels with indoor and outdoor both absent. Calling 54 dB the indoor unit would copy a description that exists only on the 22 dB listing. Calling it the outdoor unit would add a label that none of these four files print. A power-levels field of 1 is not a decibel, and a shopper question about the noise level is unanswered, so the field is the only figure. The one review, dated 1 October 2026, discusses fitting and does not mention noise. No review text on the other three listings mentions noise either. Bedroom is a room-type field, which the wall air conditioner room size page reads as room type rather than as a sound test.

Common questions

Is 27 decibels on the 18000 BTU listing indoor or outdoor?
Neither label is printed. On B0H8Q2VCMK the noise field says 27 decibels and then stops. The indoor-unit bullet belongs to the 22 dB listing, so it cannot be copied here. These four files print no outdoor decibel, so 22 and 27 are not an indoor-and-outdoor pair. The three reviews do not mention noise and do not fill the label.
What is the difference, on these files, between 27 decibels and 27 dB(A)?
B0H8Q2VCMK prints 27 decibels with no A-weighting abbreviation. B0H9F7BLX3 prints 27 dB(A) in the title and a bullet, and 27 decibels in the noise field. That file never says the two strings are one reading. You still cannot relabel the 18000 BTU line as 27 dB(A). The pages also differ in output: 18000 BTU at £599.99, against 24000 BTU/h at £799.95.
Did any review mention noise?
No review text in these four files mentions noise. B0H3B89V1W has one review body dated 21 August 2026. B0H8Q2VCMK has three, dated 6 August, 19 August, and 8 September 2026. B0H9F7BLX3 has a 1.0 rating with no review body. B0HCX2TBQX has one review, dated 1 October 2026, about fitting. A review that never discusses sound leaves the seller's label as the only noise wording.
Does sleep mode mean a second decibel figure?
No. Sleep mode is a name, not a second measurement, on the two listings that use it. On B0H3B89V1W the only decibel figure remains 22. On B0H9F7BLX3 it sits beside silent mode, and the noise field is still 27 decibels. B0H8Q2VCMK does not name sleep mode next to its 27 decibel field. Silent mode on the 24000 BTU listing is the same kind of label: a name, with no extra figure.
Can you pick the bedroom unit from the decibel line alone?
No. Only the 22 dB line is described as the indoor unit, and Bedroom on that listing is a room-type field, not a sound test. The 27 dB, 27 dB(A), and 54 dB lines leave indoor and outdoor blank, so a lower printed number is not a bedroom result. This page stops at the label the seller printed, or at the statement that the label is missing.

Related pages

Wall air conditioner buying guide

Best wall air conditioner

Wall air conditioner installation

Wall air conditioner

What size wall air conditioner for the printed room

Sources

Amazon.co.uk listing fields and captured review text from the category digest, scored on 15 October 2026. Shelf prices and star lines can change after that capture.

  1. Amazon.co.uk listing B0HCX2TBQX, 12000 BTU at £500.00 (retrieved 15 October 2026)
  2. Amazon.co.uk listing B0H3B89V1W, 9000 BTU at £599.99 (retrieved 15 October 2026)
  3. Amazon.co.uk listing B0H8Q2VCMK, 18000 BTU at £599.99 (retrieved 15 October 2026)
  4. Amazon.co.uk listing B0H9F7BLX3, 24000 BTU at £799.95 (retrieved 15 October 2026)