AC Making a Loud Noise: What Each Sound Usually Means
Air conditioners talk before they fail. Here is a rough translation, with what each repair tends to cost in Las Vegas.
By sound
| Sound | Usual cause | Range |
|---|---|---|
| Buzzing or humming from the outdoor unit, fan not spinning | Failed capacitor or a stuck fan motor | $150 to $900 |
| Loud buzzing with the unit running | Loose panel, failing contactor, or a compressor starting hard | $100 to $400, more if the compressor is going |
| Grinding or screeching from the outdoor unit | Fan motor bearings | $400 to $900 |
| Squealing inside | Blower belt or motor bearings | $150 to $1,200 |
| Rapid clicking at startup, then nothing | Contactor, relay, or control board | $150 to $900 |
| Banging or clanking | Something loose in the blower or a failing compressor | $150 to $2,800 |
| Hissing or bubbling | Refrigerant leak | $300 to $1,500 |
Turn it off if
You hear grinding, banging, or a burning smell. Running a unit with a seized motor or a failing compressor turns a part repair into a replacement.
Normal sounds
A click at start and stop, a steady hum, and the whoosh of air are normal. Rooftop package units on older central-valley homes are louder than ground units by design.
Strange noise from the AC?
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