Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing strange noises when your air conditioner is running? There's probably something wrong with your AC. If you don’t fix it, it could lead to major—and expensive—troubles eventually. We're going to help you figure out what’s occurring with your air conditioner and what you can do to fix it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling usually indicates a problem with your refrigerant line. If you can't identify where the noise is emanating 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 be due to debris in the unit or aging ductwork. Debris in the outdoor unit will create a noise outside your house. Mature ductwork can cause noise inside your house. Check out our crackling noise guide for more information.
  • Hissing - Hissing can be created by a faulty refrigerant line, an internal valve leak or the compressor. Check out our hissing noise guide for more information.
  • Buzzing - Buzzing is likely an electrical issue. Check out our buzzing noise guide for more information.
  • Clicking - Clicking can indicate 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. 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. Check out our loud noise guide for more 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 more information about common air conditioning problems 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 examining your system.

Usually, 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 recognize there's something wrong with your system. While AC repairs can be stressful and an unexpected expense, it's best to get problems fixed right away. Contacting a professional could help reduce 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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