there isn't a single universal noise level standard for air conditioners. The acceptable noise level for air conditioners can vary depending on factors such as the type of air conditioner, its capacity, the intended use of the space it's installed in, local regulations, and individual preferences.
For residential air conditioners, most manufacturers aim to produce units with noise levels ranging from 50 to 70 decibels (dB) during operation. Quieter models, especially those designed for bedrooms or quiet spaces, may have noise levels below 50 dB.
Commercial and industrial air conditioners, which tend to be larger and more powerful, can produce noise levels ranging from 60 to 80 dB or even higher. These units are typically installed in locations where noise considerations are less critical, such as factories or large commercial buildings.
It's essential to consider the noise level when purchasing an air conditioner, especially if it will be installed in a living space or a quiet environment. Look for the manufacturer's specifications for the noise level in decibels, and choose a unit that suits your specific needs and preferences.