This part of ISO 13261 specifies methods for the determination of sound power ratings of air-conditioning and airsource heat pump equipment to be used indoors. It is applicable to the sound power rating of the indoor sections of non-ducted, factory-made, residential, commercial and industrial air-conditioning and air-source heat pump equipment, which are electrically driven with mechanical compression including free-delivery heat pumps, packaged-terminal air-conditioners and water-source heat pumps. This part of ISO 13261 includes both an octave-band sound power level rating and a single-number A-weighted overall sound power level rating. This part of ISO 13261 does not apply to ducted indoor equipment, or to chillers, room fan coil units, products with variable speed compressors, or industrial process equipment. NOTE — The terms "air-conditioner" and "equipment" are used to mean "air-conditioners and air-source heat pumps" in this part of ISO 13261.