Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing strange noises when your air conditioner is running? There's a strong probability there’s something wrong with your AC. If you ignore it, it could lead to major—and expensive—problems later. We're going to help you understand what’s happening with your air conditioner and what you can do to fix it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling normally indicates an issue with your refrigerant line. If you can't determine where the noise is emanating from, that's alright. An expert can help determine where this noise is occurring. You can learn more information on our gurgling noises guide.
  • Crackling - Crackling could come from debris in the unit or aging ductwork. Debris in the outdoor unit will generate a noise outside your house. Old ductwork can produce noise inside your house. Browse our crackling noise guide for more information.
  • Hissing - Hissing can be caused by a faulty refrigerant line, an internal valve leak or the compressor. Check out our hissing noise guide for more info.
  • Buzzing - Buzzing is probably an electrical issue. See our buzzing noise guide for additional information.
  • Clicking - Clicking can hint you have a loose part or that the fan is misaligned. You can find more information in our clicking noise guide.
  • Pulsating - Pulsating can come from a loose part. Take a look at our pulsating noise guide for more information.
  • Loud Noise - A loud noise from your external unit can signal an issue with your compressor, damper, fan or air handler. Read our loud noise guide for additional information.
  • Humming - Humming can begin with fan motor issues or a damaged relay switch. Check out our humming noise guide for more information.

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


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

There are some cases where you can continue to run your AC, but you do so at your own risk. It's almost impossible 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 an issue with your unit. While AC repairs can be stressful and an unexpected cost, it's better to get problems taken care of right away. Calling a professional could help minimize future expenses and keep your system running longer.

Not sure if your air conditioner is making any of these noises? Please fill out the form below for a free, in-home consultation.

Contact Us