Yes, you should immediately turn off your air conditioner if it begins making loud, unusual, or alarming noises. Strange sounds—such as metallic screeching, grinding, loud banging, or continuous buzzing—are often distinct warning indicators of mechanical failure, loose components, failing fan bearings, or motor stress. Continuing to operate a noisy HVAC system can quickly transform a minor, inexpensive repair (like tightening a loose bracket or replacing a worn belt) into catastrophic equipment failure, such as a seized compressor or total motor burnout, which requires costly replacement.
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