Air Conditioning, Featured, Service & Maintenance

Air Conditioner Sounds You Don't Want to Hear

Air Conditioner Sounds You Don't Want to Hear

When an air conditioner is functioning correctly, it will make relatively little noise. However, air conditioners can develop problems over time as internal parts undergo wear and tear. Many of these problems are indicated by specific noises. Understanding what the different air conditioner sounds mean can help you to diagnose problems and seek help when necessary.

Here are some of the sounds that can tell you when your HVAC system needs to be serviced by a professional.


If the blower motor screeches while it's operating, this may be due to a belt that's wearing out. Worn belts aren't expensive to replace, but if they wear out completely and break, the blower motor will be unable to function.

Thudding, Rattling and Clanging 

When you hear rattling, this usually means that a part within the system is coming loose. The problem should be repaired before the part comes all the way loose or breaks. If your system is producing a loud banging noise, it likely means a part has come loose or is broken. In either case, shut off the system and contact a professional.


A rapid slapping sound that occurs when the blower is on may be caused by something stuck in the blades. Alternatively, there could be something coming into contact with the blower while it's turning. It's possible that neither of these problems will cause your HVAC system to break down immediately, but they can create resistance and that may lead to the motor wearing out quickly.


When your air conditioner is functioning normally, you can expect to hear clicking noises as it cycles on and off. These clicking noises come from the relays and controls. However, repeated clicking can be a symptom of a failing control or thermostat.

Our goal is to help educate our customers in the Tulsa and Broken Arrow, Oklahoma area about energy and home comfort issues (specific to HVAC systems). Credit/Copyright Attribution: “Christian Delbert/Shutterstock”