A normal, healthy residential air conditioner typically generates sound levels ranging between 60 and 75 decibels, which is similar to the background volume of a normal conversation or a standard household refrigerator running in a kitchen. For indoor components, you should experience a quiet, steady rushing of air from the supply registers and a very faint, muffled hum from the air handler or furnace blower. For outdoor condenser units, a uniform, low-pitched mechanical hum and the smooth whir of the top exhaust fan are standard. If your system noise level rises significantly above this baseline, or if it introduces harsh mechanical tones like rattling, screeching, or grinding, it crosses the threshold from normal operation into potential mechanical failure.
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