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Heating, Cooling, and Electrical Experts in the Raleigh Triangle

24 Hour Service. Call Anytime!


Heating, Cooling, and Electrical Experts in the Raleigh Triangle

24 Hour Service. Call Anytime!



Sloan Service Company, Inc. Blog

These Noises Mean Trouble For Your AC


Is your air conditioning system making noises that you haven’t noticed before? Modern air conditioners are designed to run without producing too much noise. While no air conditioner works completely silently, it is a good idea to keep your ears open for any sounds it shouldn’t make. If your air conditioner is making strange noises, it could be a sign of significant trouble, and you might need to schedule our services for AC repair in Cary, NC, to deal with it on time.

This guide will tell you about some of the noises that mean trouble for your AC so that you know when to call us for repairs before it is too late.

Strange AC Sounds Explained 

Here are some of the strange sounds your AC should not make and what they mean.


If you hear a rattling sound coming from your air conditioner, it could be a sign that one of the smaller components, nuts, or bolts has come loose. The rattling sound could also indicate a failing compressor that needs replacement. We advise turning off your air conditioner if you hear any such sounds because keeping it running like this will only make the problem worse. 


It is normal to hear your air conditioner make a low humming sound when it is running. However, a whistling sound that gets louder and is persistent could be a sign of major problems. A whistling or hissing sound could indicate that there may be a refrigerant leak that is releasing the refrigerant at high pressure, causing a hissing sound. You should immediately turn off the air conditioner and call a professional to examine it so that you can avoid more expensive repairs down the road.

Banging, knocking, or clanking

If you hear banging, knocking, or clanking sounds coming from your air conditioner’s outdoor unit, it is usually a sign that something is wrong with the unit’s fan. The air conditioner’s blower motor might have started getting loose and is striking the housing or other parts of the air conditioner. It is also possible that the fan is hitting an object that fell inside the unit. Do not ignore any of these sounds and turn off the system immediately before calling a technician.

Buzzing sounds

Are you hearing buzzing sounds coming from the air conditioner? These noises might be related to electrical issues with your air conditioner or a failing compressor. Sometimes loose and old wiring could be the reason for this noise. Letting your air conditioner run like this could be dangerous because it can lead to major electrical problems in your house. 

Is Your AC Making Strange Noises?

If your air conditioner makes strange noises, you should not ignore them even if the system is cooling your home properly. We strongly suggest turning off your air conditioner instead of letting it run like this and cause more damage to the unit. It would be best to call professionals to come and repair the AC before it leads to more expensive repairs, and that’s where we come in.

Call Sloan Service Company, Inc. to get AC repair in Cary, NC from Heating, Cooling & Electrical Experts.

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