Different sounds usually point to different problems — here's a plain-English breakdown.
Often points to a motor bearing wearing out — usually worth addressing before it fails completely and causes a bigger repair.
Commonly a belt or motor bearing issue, similar to a squealing sound from a car engine.
Can indicate an electrical relay issue or a failing capacitor — worth having checked rather than ignored.
Often a loose or broken part inside the unit — continuing to run the system can cause further internal damage.
Can indicate a refrigerant leak, which needs professional handling — refrigerant work requires certification.
Frequently an electrical issue — loose wiring or a failing component drawing irregular current.
Depends on the sound. A single click at startup/shutdown is normal. Continuous grinding, banging, or hissing is worth turning the system off and having it inspected before running it further.
Yes — normal operation includes some fan and compressor sound. What matters is a change from your system's normal sound, or new sounds that weren't there before.
See our full AC Repair service or browse other common symptoms.