Every Air Conditioner has an SRN…sound rating number. The SRN is a way of comparing and measuring sound levels of AC units. The amount of noise an AC makes has no bearing on how efficient the unit is, however it may affect your personal comfort level.
Sound rating numbers range from 6.8 (quietest) to 13 (loudest). Most air conditioners operate at 7 to 9 bels. A unit operating at 9 bels is actually 10 times louder than an AC operating at 8 bels. Not much of a difference number wise, but a big difference in sound levels.
If a quieter AC is what you are aiming for, there are several ways to accomplish that. Sound barrier walls, moving the unit or even replacing it. The most cost efficient solution is to use a sound blanket. Some models come with a built in sound blanket…not to say you can’t add another one. Again, it all comes down to personal comfort levels.
The blanket goes around the compressor to help dull the sound.Manufacturer’s guarantee a decrease of 5dB in sound levels…thats about a 40% reduction!! A sound blanket has no ill effect on the operation or efficiency of the unit. The compressor is cooled by the refrigerant so there is no worry of overheating.
Keep in mind as well, where the AC is going to be installed at your home. Good placement and the use of a sound blanket will keep you and your neighbours comfortable!