Common AC Sounds You Should Be Aware Of

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It can sometimes be difficult to know if you need AC service if your AC seems to be cooling your home and working properly. However, there can often be unseen problems that could be causing mechanical components to wear down, eventually resulting in a breakdown. Fortunately, there are often signs of a needed repair if you listen carefully to how your AC usually sounds so that you can be aware of unusual sounds. Here are some sounds you should pay attention to.


Clicking is actually a typical sound you may notice when the AC turns on or shuts off. But if you hear consistent clicking while the AC is running there could be a problem with the thermostat or something else. Additionally, if the clicking at startup and shutdown seems louder than usual, there could be something loose inside the compressor, and an AC technician should check it out.

Outside Buzzing

Buzzing on the outside compressor unit of the system may be from something as simple as debris that’s gotten in the unit, or it may be from something more serious like loose connections or an electrical issue. If you’re certain debris isn’t the cause of the buzzing you should turn off the system and call AC technicians right away because there’s an added fire danger to think about if the problem is electrical.


Squealing may occur only when the unit turns on, or it may also continue throughout the on cycle. Squealing is often a sign of a problem with the fan motor or blower wheel and may indicate the need to replace the part soon.


Banging sounds usually mean that some part has worked its way loose or broken off and is now moving around in the AC. Sometimes the fix is as simple as a screw that needs to be replaced, and in other cases, a larger part is to blame like the crankshaft or a connecting rod. In any case, it’s important to turn off the system when you hear banging or clanking noises because it definitely means that something is wrong and needs to be repaired before more damage occurs.

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Hissing or bubbling sounds can mean a couple of things, depending on where the sound is coming from. If the hissing seems to be coming from inside the walls, it’s likely that there’s a leak in a duct. If the sound is coming through the vent, there may be a problem with the filter, like an incorrect size or improper installation. A major refrigerant leak will also cause a short-term, loud hissing sound until the refrigerant runs out. A smaller leak may make a bubbling sound instead. In any case, if you hear a sound indicating a possible refrigerant leak, it’s important to call a professional right away.


There’s a sensor in the air conditioner that prevents the AC from operating if the pressure is too high. However, if this sensor malfunctions it may emit a high-pitched screaming sound. If this happens, you should turn off the AC and call the professionals right away. If you hear any of these sounds when your air conditioner is running, be sure to call Gainesville Mechanical, the best AC service in Gainesville, GA, to get the problem diagnosed and repaired as soon as possible. (770) 532-9130

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