Why Is My Air Conditioner Making A Noise?

Hearing strange noises when your air conditioner is working? There’s likely something wrong with your system. If you don’t fix it, it could lead to extensive—and expensive—issues later. We’re going to help you find out what’s happening with your air conditioner and what you can do to change it. 

8 Common Air Conditioning Noises 

  • Gurgling – Gurgling usually indicates an issue with your refrigerant line. If you can’t pinpoint where the noise is emanating from, that’s alright. A technician can help determine where this noise is occurring.
  • Crackling – Crackling could result from debris in the unit or aging ductwork. Debris in the outdoor unit will create a noise outside your house. Aging ductwork can cause noise inside your house.
  • Hissing – Hissing sounds coming from your AC can be caused by a faulty refrigerant line, an internal valve leak or the compressor.
  • Buzzing – Buzzing is no doubt an electrical issue.
  • Clicking – Clicking can mean you have a loose part or that the fan is misaligned.
  • Pulsating – Pulsating can be due to a loose part.
  • Loud Noise – A clear noise from your outside unit can signal an issue with your compressor, damper, fan or air handler.
  • Humming – Humming can be related to fan motor issues or a broken relay switch. Check out our humming noise guide for more information. 

You can find additional information about common air conditioning problems on energy.gov 

Should I keep operating my air conditioner when it’s making a noise? 

There are a few cases where you can continue to run your AC, but you do so at your own risk. It’s difficult to answer this question without looking at your system. 

In most cases, we recommend shutting off the unit off and contacting a professional. 

When should I do something about the noise? 

We recommend calling a professional as soon as you suspect there’s something wrong with your system. While AC repairs can be stressful and an unexpected spend, it’s better to get problems fixed right away. Calling a professional could help lower future expenses and keep your system running longer. 

Not sure if your air conditioner is making any of these noises? Please schedule online for a free, in-home consultation.