AC Making Strange Noises: Buzzing, Rattling, Grinding and More

A guide to common AC noises and when buzzing, rattling, grinding, squealing, or clicking can indicate a service problem.

New or worsening HVAC noises are worth paying attention to because the sound often indicates where to start looking.

Common sound categories

• Rattling: loose panels, debris, or vibration
• Buzzing: electrical or motor-related issues
• Grinding: bearing or motor problems
• Squealing: belt or motor-related noise on applicable systems
• Repeated clicking: control or electrical issues

Turn the system off if a noise is severe, accompanied by burning smells, or suggests a failing rotating component.

For service, see AC repair in Riverview.

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