If your HVAC system is making unusual noises, it’s probably a sign of mechanical failure. Belts, bearings, and other components can become loose or broken due to wear, tear, or a lack of maintenance. If you notice your air conditioner or heater making screeching, grinding, or any other noise you don’t recognize, turn it off immediately to avoid further damage and call a licensed HVAC team like ours to assess the cause and fix the problem. Never attempt a repair on your own!