Why Is My Air Conditioner Making A Noise?

July 26, 2019

Hearing odd noises when your air conditioner is working? There's probably something wrong with your system. If you don’t fix it, it could lead to major—and expensive—issues down the road. We're going to help you figure out what’s occurring with your air conditioner and what you can do to correct it.

8 Common Air Conditioning Noises

  • Gurgling - Gurgling normally indicates an issue with your refrigerant line. If you can't identify where the noise is emanating from, that's alright. A professional can help find out where this noise is occurring. You can find 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. Mature ductwork can cause noise inside your house. Check out our crackling noise guide for more information.
  • Hissing - Hissing can be caused by a leaky refrigerant line, an internal valve leak or the compressor. Look through our hissing noise guide for more info.
  • Buzzing - Buzzing is likely an electrical issue. See 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 be due to a loose part. Check out our pulsating noise guide for more information.
  • Loud Noise - A clear noise from your outdoor unit can mean an issue with your compressor, damper, fan or air handler. Look at our loud noise guide for supplementary information.
  • Humming - Humming can arise from fan motor issues or a busted 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 using my system 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 hard to answer this question without examining your system.

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

When should I do something about the noise?

We recommend calling a professional as soon as you think there's an issue with your unit. While AC repairs can be stressful and an unexpected cost, it's best to get problems taken care of 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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