https://www.cooling-heating.org/ Decibel Ratings Air conditioner manufacturers give the machines a decibel rating, which is listed on its label. The decibel rating typically describes the sound output heard by a person standing near the air conditioner in a noninsulated setting. Air conditioners with a high cooling output often produce high decibels. Some air conditioners equipped with special sound reduction technology are also more expensive than regular conditioners. Sound insulation and distance will reduce the perceived loudness.