Air Conditioner Noises Essential Guide – 6 Signs & Causes

If you’ve ever been woken up in the middle of the night by a loud noise coming from your air conditioner, you’re not alone. A/C units are notorious for making strange and unexpected sounds. In most cases, these noises are nothing to worry about. However, if you’re not sure what’s causing the sound or whether it’s normal, you may need some help figuring it out.

This blog post will discuss the different types of noises that air conditioners can make and what they might mean for you. Our team from Aircond Xpert JB will also provide some tips for troubleshooting and fixing common aircon problems.

6 Signs and Reasons Behind a Noisy Air Conditioner

Here are six common types of noises that you might hear coming from your A/C unit and what they could mean:

Rattling or Clunking

If your air conditioner is making a rattling noise, it could signify that something is loose inside the unit. This might be a loose fan blade, a broken part, or a piece of debris.

If you have an older air conditioner, this noise could also be a sign that the parts are beginning to break down. If you hear a rattling noise coming from your air conditioner, it’s essential to have a professional take a look to determine the cause.


One of the most common signs that something is wrong with your air conditioner is when it starts making clicking noises. This can be either a faint clicking sound when you turn it on or off or a more persistent clicking noise that continues throughout the day.

There are several potential reasons why your air conditioner might be making this noise, but one of the most common is a defective control in the thermostat.

Buzzing Sound 

Many things may cause a loud buzzing noise in an air conditioner unit. Loose components, indoor and outdoor unit trash, broken fan blades, filthy filters and condenser coils, and faulty refrigerants are all potential causes of the sound.

If the buzzing noise is coming from the outdoor unit, it may be caused by a blockage in the airflow. This can be caused by leaves or other debris accumulated around the unit. If the noise is coming from the indoor unit, it may be caused by a dirty filter or condenser coil.

Humming Sound

Many homeowners are familiar with the soft humming noise that their air conditioner makes when it’s running. While this sound is generally harmless, it can be frustrating if it becomes loud or constant.

There are a few different reasons why your air conditioner might start making more noise than usual. It may be due to a build-up of dirt and dust on the coils in some cases. This can cause the unit to vibrate, resulting in a humming noise. If the problem is not addressed, it can eventually lead to damage to the coils and other components.

Another common cause of excessive noise is a loose fan belt. This can cause the fan to spin erratically, which will create a humming sound. If you notice that your air conditioner is making more noise than usual, it’s crucial to have a professional inspect the unit as soon as possible.

High-Pitched Noise

A sudden, high-pitched noise coming from your air conditioner is most likely due to a refrigerant leak. This is a serious issue that needs to be addressed immediately, as it can damage the machine and pose a health hazard to your family.

If you hear a noise coming from your air conditioner, turn it off and do not use it until an expert has looked at it. In the meantime, open all of the doors and windows in your home to ventilate the area and prevent any harmful fumes from circulating.

Whirring Noise

One common cause of whirring noise is a piece of debris stuck in the fan blades. This can happen with both indoor and outdoor units. If you notice a whirring noise, a small amount of debris is likely caught in the blades. You can simply remove the debris in most cases, and the noise will stop.

However, if the noise is more like helicopter blades, there is likely a problem with the fan motor or blades. In this case, it’s best to call a professional for help. With a bit of troubleshooting, you can usually identify the noise source and take care of the problem quickly and easily.

How to Reduce Aircon Noise?

Final thoughts

If you’re hearing strange noises coming from your air conditioner, it’s essential to note what the noise sounds like and when you listen to it. This will help a professional troubleshoot the problem and determine the best course of action. In most cases, the issue is something simple that can be fixed with little maintenance. However, if the noise is constant or getting louder, it’s best to call an aircon specialist for help. With their help, you can get your air conditioner back to running smoothly and quietly in no time.

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