Air conditioing systems require external condenser units; outdoor units produce noise which may affect localised noise sensitive dwellings.

British Standard 4142 establishes appropriate measurement protocol and assessment criteria for industrial/commercial sources of noise affecting residential dwellings.

Sound Planning can also calculate internal noise levels, predicting system losses and internal sound pressure levels. Approriate attenuation (duct silencers) is calculcated and assessed against criteria provided within British Standard 8233: 1999.