Quietest 1.5 kW (≈5,000 BTU) air conditioners in the UK: 13 models ranked by outdoor sound power
Mitsubishi Heavy Industries LMK 1.5 kW (LMC05Z7-W) is the quietest of these 13 at ≈56.0 dB(A) outside. If the unit will sit near a neighbour's window, start with the pass-distance column before the brand.
computed
Ranked models
13 models match this list. Outdoor LwA, low to high.
| Rank | Model | LwA dB(A) | 3 m dB(A) | SEER | £ at 400 h | Refrigerant | Observed price |
|---|---|---|---|---|---|---|---|
| 1 | Mitsubishi Heavy Industries LMK 1.5 kW (LMC05Z7-W) | 56.0 | 38.5 | 6.4 | £24.68 | R32 | — |
| 2 | Mitsubishi Heavy Industries SRK 1.5 kW (SRC15ZTL-W) | 56.0 | 38.5 | 6.4 | £24.68 | R32 | — |
| 3 | Mitsubishi Electric Elegance 1.5 kW (MUZ-AY15VG2) | 58.0 | 40.5 | 7.2 | £21.93 | R32 | — |
| 4 | Gree GWH 1.5 kW (GWH05AWAXA-K6DNA1A/O) | 59.0 | 41.5 | 6.6 | £23.93 | R32 | — |
| 5 | Toshiba RASB 1.5 kW (RAS-05E2AVG-E) | 60.0 | 42.5 | 6.9 | £22.89 | R32 | — |
| 6 | Toshiba RASB 1.5 kW (RAS-05J2AVG-E) | 61.0 | 43.5 | 6.1 | £25.89 | R32 | — |
| 7 | Toshiba RASB 1.5 kW (RAS-05B2AVG-E) | 62.0 | 44.5 | 6.1 | £25.89 | R32 | — |
| 8 | Carbone 1.3 kW | 63.0 | 45.5 | 3.2 | £42.77 | R290 | — |
| 9 | Mitsubishi Electric AP 1.5 kW (MUZ-AP15VG) | 63.0 | 45.5 | 7.2 | £21.93 | R32 | £308.99 |
| 10 | Ningbo JAY AND MIN International Trading 1.3 kW | 63.0 | 45.5 | 3.2 | £42.77 | R290 | — |
| 11 | Toshiba RASB 1.5 kW (RAS-05BAVG-E) | 63.0 | 45.5 | 5.6 | £28.20 | R32 | — |
| 12 | Elyon 1.3 kW (35F3) | 65.0 | 47.5 | 2.4 | £57.03 | R32 | — |
| 13 | Elyon 1.3 kW (EBEC) | 68.0 | 50.5 | 2.4 | £57.03 | R32 | — |
EPREL manufacturer-declared registrations · snapshot 25 Sep 2026 · n=13 · Outdoor LwA, low to high; noise via contract_engine MCS 020a Q=2, no barrier · updated 25 Sep 2026 · version 1.0.0 · CSV of the values on this page
How this page was calculated
If the calculated sound pressure level at all assessment positions is equal to or lower than 37.0 dB(A) then the heat pump will comply with the Permitted Development noise limit
Other lists at this capacity
Better than a best-of roundup with no figures: every row is a registered number and a link to the model card.