AC Issues: Why Your Air Conditioner Is Making Noises

If you want to live comfortably in your home, you must install an air conditioner. Air conditioners produce cool air that can reach an entire room, making them one of the pinnacles of modern technology. Unfortunately, older air conditioners used to make a lot of noise, which is very counterintuitive to the goal of living comfortably.

Thanks to technological advancements, air conditioners became quiet as modern versions were produced. The reason for this is because of 2-stage variable heat compressor technology combined with sound reduction capabilities. If you have a high-efficiency unit like this, the sound is the least of your worries. However, it can be a massive problem if you hear sounds coming from it that are out of the ordinary.

In this article, we list down the possible reasons why your AC unit is making noises. Read on below to learn more.

Banging Noises

Detached or broken internal components often cause banging noises. It could either be a connecting rod, a crankshaft, a piston pin, or any other smaller piece that’s part of the internal compressor. In some cases, it might be due to an internal blower that’s in poor balance.

If this is indeed the problem, you’ll likely need to replace the compressor.

Buzzing Noises

Buzzing noises coming from an AC unit is one of the more complicated problems to diagnose. Many things can cause them, such as: 

  • Debris is blocking a particular path of the unit.
  • Loose parts within the unit.
  • The blower or internal fan blades are not appropriately balanced.
  • The condenser coil simply requires cleaning or maintenance.
  • The copper lines that run from the unit’s exterior to the interior touches something and vibrates from that surface.
  • The refrigerant is leaking.

Because of the complicated nature of buzzing noises in an AC unit, you’ll need to call a professional to determine the cause of the problem.

Clicking Noises

Hearing clicking sounds is normal in many AC units when starting up or turning off. However, the sounds become a problem if they can still be heard even if the unit is operating.

Frequent clicking sounds are usually a sign that the thermostat is failing or the controls are becoming defective. These issues are usually caused by electrical problems, which can be very dangerous and costly to fix.

Humming Sounds

Humming sounds aren’t inherently causes of concern, but vibrations usually cause it due to loose parts and refrigerant piping. They can also signify other electrical issues such as a malfunctioning compressor or loose wiring.

Rattling Sounds

Outdoor debris can get caught in your AC unit’s system, which produces rattling sounds. The usual culprit for this issue are rocks, twigs, and other materials from your surroundings.

On the other hand, rattling sounds can also be caused by issues such as loosening parts within the compressor. The first thing to do when hearing these sounds is to check for any loose parts. You should also clean your unit’s condenser coil and change its air filter.

Squealing Sounds

Squealing noises signify that the indoor blower motors and outdoor fan motors are starting to degrade in terms of functionality. The squealing noises are heard because it travels through the duct systems. It’s important to note that some units also squeal naturally, so you must know how to distinguish natural squeals from unnatural ones.


If you want to continue living comfortably, you need to maintain your AC unit in top shape. At the first sign that you hear strange sounds that are either unnatural or shouldn’t occur in the first place, call a professional AC repair service to fix the problem.

Good Guys Home Services provides top-quality services for air conditioner repair in Indiana and other areas. All of our staff members have years of experience, so we can guarantee that you won’t have any problems when we take the job. Contact us today to learn more!


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