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 unit. If you ignore it, it could lead to extensive—and expensive—troubles later. We're going to help you understand what’s occurring with your air conditioner and what you can do to change it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling normally indicates a problem with your refrigerant line. If you can't pinpoint where the noise is coming from, that's alright. A professional can help verify where this noise is occurring. You can read more information on our gurgling noises guide.
  • Crackling - Crackling could result from debris in the unit or aging ductwork. Debris in the outdoor unit will cause a noise outside your house. Aging ductwork can cause noise inside your house. Check out 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 information.
  • Buzzing - Buzzing is no doubt an electrical issue. Check out our buzzing noise guide for further information.
  • Clicking - Clicking can hint you have a loose part or that the fan is misaligned. You can see more information in our clicking noise guide.
  • Pulsating - Pulsating can be caused by a loose part. Go through our pulsating noise guide for more information.
  • Loud Noise - A noticeable noise from your outside unit can indicate an issue with your compressor, damper, fan or air handler. Read our loud noise guide for additional information.
  • Humming - Humming can arise from fan motor issues or a damaged relay switch. Check out our humming noise guide for more information.

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


Should I keep running my system when it’s making a noise?

There are limited 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.

Most of the time, we recommend turning the unit off and calling a professional.

When should I do something about the noise?

We recommend calling a professional as soon as you suspect there's a problem with your air conditioner. While AC repairs can be stressful and an unexpected expense, it's best to get problems corrected right away. Getting 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 fill out the form below for a free, in-home consultation.

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