Quietest 2.5 kW (9,000 BTU) air conditioners in the UK: 36 models that pass 37 dB at 4 m
ElectriQ EIQ 2.7 kW (EIQ-9WMINVEX-V5) is the quietest of these 36 that pass at 4 m, at ≈30.0 dB(A). If the outdoor unit will sit closer than 4 m to a neighbour's window, use the 4 m column before you shortlist.
computed
Ranked models
36 models match this list. Sound pressure at 4 m, low to high, among passes.
EPREL manufacturer-declared registrations · snapshot 25 Sep 2026 · n=36 · Sound pressure at 4 m, low to high, among passes; 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
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Better than a best-of roundup with no figures: every row is a registered number and a link to the model card.