We’ll give you the Decibel (dB) levels and offer the “plain spoken” translation. The COOLIT series ranges from 52 dB – the sound in a normal office to 58 dB – a sewing machine or typewriter. The PortaPac series have powerful blowers and the noise levels will vary depending on the ducting. You can figure on an operating level of around 68 - 70dB – a refrigerator or vacuum cleaner.