air conditioner sounds like a jet engine
Homes are not completely quiet when refrigerators, washing machines, and other appliances are running. Even air conditioners emit a faint sound. However, a loud noise, such as when an air conditioner makes a loud noise when starting, is not normal. This article discusses some of the causes and solutions for a loud air conditioning unit.
No air conditioning unit is completely quiet. Even new units will produce certain sounds which are completely normal for day-to-day use. In some cases, however, the air conditioner noises may be a symptom of a bigger problem that indicates that the unit should be inspected by a professional right away.