The sales of windows air conditioners are generally higher than those of Split air conditioning - for both domestic and commercial purposes. It does not occupy any space of the room as its body remains outside the room and fits on the window. However, the window air conditioners tend to generate noise over a period of time depending on their type and size. The occupants could become irritated by the noise.

Sound power levels are mentioned on the label. The noise level is represented in terms of the unit decibel. If the decibel ratings are higher, the sound will be louder. A buyer should remember that for an increase of 10 decibels the factor will increase by 10. Therefore, 50 decibels would be 10 times louder than 40 decibels.

The compressor and fan act as the source of noise as they are both combined in a single unit in a window air conditioner. Many other factors can produce noise like cabinet rattles, rusty fan blades, worn bearings, compressor wear and worn rubber mountings. The noise levels can be kept down with regular maintenance, but it will only keep getting louder as the air conditioner unit ages. Professional service and maintenance can minimise the noise.