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Common Air Conditioner Sounds

What Are Air Conditioner Sounds That You Need to Beware Of

The low hum of an air conditioner is a sign of warmer weather and the opportunity to enjoy cool air on a hot, humid day. An air conditioner has a lot of different parts that all work together to keep it running. The age of the unit and how often it’s used can affect how well it works. This is the reason your AC unit is making strange noises, it could be a sign that it needs to be repaired.

What are specific air conditioner sounds you need to know? Keep reading below.


If your AC unit is making loud banging noises, turn off the power to the unit immediately. The compressor may be causing the noise. If the unit is allowed to continue making noise, you may need to replace the entire unit.

Bubbling or Gurgling

If you hear a bubbling or gurgling noise coming from your air conditioner, it could be a sign of a refrigerant leak. Refrigerants can be harmful to your health if you’re exposed to them, so it’s important to call a repair service if you think there might be a leak. A drop in refrigerant can also damage your air conditioner, so it’s best to get it checked out as soon as possible.


In short, if your air conditioner starts making a buzzing noise, it’s time to call a maintenance specialist. It could be a simple problem like a frozen line, but it could also be something more serious like frayed electrical wiring.


A rattling noise produced by your air conditioner could be a cause for concern, and you should have a professional take a look at it as soon as possible to determine the root of the problem.

Running Water

The sound of running water coming from your air conditioner could mean that there is a problem with the drain line. This could be because the line is split or broken, which can cause damage to the unit and the surrounding area. If you hear this noise, you should call a professional technician to have the problem repaired.


If your air conditioner starts making a loud screeching noise, it may mean that the belt or fan is beginning to wear down. If the noise stops when the unit is running at full capacity, the issue may be with the compressor. Either way, it’s best to call a professional repair service.


If your air conditioner starts making a deafening humming noise that sometimes sounds like a tea kettle whistling, it may mean that there’s a loose seal somewhere in the AC. Other possible causes include a loose fan belt, worn-out bearing, or internal pressure buildup. In some cases, the whistling noise may also be caused by a motor that needs to be lubricated, or it may be the first sign that the compressor is starting to fail. If you hear your AC making a whistling noise, it’s a good idea to have it serviced as soon as possible.


There are several air conditioner sounds to beware of. If your air conditioner is making any of the mentioned sounds above, it could be a sign of a severe problem. If you suspect your air conditioner is in need of repair, be sure to contact a qualified technician as soon as possible.

For reliable residential AC repair in Castle Rock, turn to CG Heating & Cooling. Our technicians are NATE and EPA-certified. With over 20 years in business, we have the experience to handle all your heating and cooling needs. Request a quote!