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Why is My AC Making Noise?

air conditioner making noise

As spring gives way to summer, you may find yourself running your air conditioner more and more. You need a reliable AC unit to combat the humid Southern summer, so strange AC noises are cause for concern. Don’t ignore these noises, as they could indicate your air conditioning unit is malfunctioning. By scheduling AC repair in Beaufort and Port Royal Island, you may be able to prevent a minor AC problem from becoming a costly AC replacement.

Is Your AC Making Strange Noises?

Faulty air conditioners can make many different sounds. Here are some of the most common noises and what it takes to fix them.


A clanging air conditioner is likely caused by a foreign object obstructing the fan. Check for a rock, stick, or other item in the outdoor condensing unit. If you can easily remove it, do so. To avoid debris falling into your AC in the future, take care to keep the area around it tidy, and discourage children from playing near the unit.

If you can’t see anything blocking the fan, the clanging may be caused by a loose or out-of-balance part. You may need a professional repair to make the sound stop.


It’s normal to hear a slight click of electrical components during the start-up and shutdown cycles. However, if the noise continues while the system operates, this could be a sign of a failing thermostat or defective control. You may need to replace the malfunctioning part to get your air conditioner working normally again.


This sound is never a good sign. It most likely means a component has just failed or is about to. Turn off the air conditioner immediately to avoid damaging other parts. Then, schedule a repair with an AC technician.

Hissing or Whistling

If these sounds come from the indoor or outdoor unit, they could signal a refrigerant leak. A leak lowers the unit’s charge and greatly reduces system efficiency. What’s more, refrigerant can be harmful to your family and pets. You’ll need a professional’s help to fix the leak and recharge the system.

If the hissing or whistling comes from under the floor or above the ceiling, loose ductwork could be causing this annoying sound and wasting energy in the process. Depending on where the leaky ducts are located, you may be able to seal them yourself using duct mastic—not duct tape. (The name of this adhesive is a misnomer. It doesn’t serve as a long-term fix for sealing ductwork.)


A buzzing outdoor unit could mean many things. To resolve the issue, try changing the filter. Then, check for obstructions in and around the condenser unit. Spray it with a hose to remove any debris.

If these tips don’t stop the buzzing, there could be an issue with the outdoor fan motor or blades. When a buzzing air conditioner also fails to cool your home, this could signify a refrigerant leak. Both of these problems require a professional repair.

Squeaking or Squealing

An air conditioner that squeaks or squeals is most likely suffering from a loose, misaligned, or fraying fan belt. A worn-out belt will eventually break, potentially damaging other components. Turn off the air conditioner and leave the repair to a professional.

When Should I Call an AC Repair Technician?

Many AC noises are easy to remedy. However, if you attempt the simple troubleshooting tips we outlined above without success, you know it’s time to schedule an air conditioner repair. The professionals at Beaufort Air Conditioning can diagnose and fix the problem so your AC unit runs reliably (and quietly) for the rest of the summer.

Contact us online or call (843) 524-0996 today to request AC repair in Beaufort, SC or Augusta, GA. We have 40 years of experience serving residential and commercial customers.

air conditioner making noise

AC Repair in Beaufort, SC

When you need air conditioning repair you can trust, choose Beaufort Air Conditioning as your local HVAC company. We’ve been serving the Beaufort, SC area for four decades, and are trusted by residents and businesses alike.

Contact us online or call us today at (843) 524-0996 to schedule AC repair in Beaufort or surrounding areas.

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