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Serving The Northland

Serving the Northland


Mesaba Heating & Air Conditioning Blog

Your Air Conditioner Shouldn’t Be Making These Noises


Unfortunately, no air conditioner will ever operate completely silently. But there are good noises and bad noises, and it’s important to recognize when a sound from your air conditioner is a signal that something is wrong. The good noises are simple and consistent: the compressor makes a humming sound during cooling cycles, and you can also hear the fan whirring. What air conditioner noises are a sign of trouble and should have you calling for repairs right away? Here are some things to keep an ear out for.

But first, you should trust your instincts. Any new, sudden, or surprising noise is worth paying attention to. If you’re concerned that something is wrong with your air conditioner, it’s always better to consult a technician as soon as possible. This can often prevent a minor issue from becoming a big problem. 

If Your Air Conditioner Thumps or Bangs

This could be a problem with the compressor. You should turn the unit off immediately to avoid putting any further stress on this critical component, which functions like the heart of the air conditioner, pumping refrigerant through the coils. Replacing a compressor can be expensive enough that buying a new air conditioner might be the better option. Catching this problem early could mean repair is still possible. And if you’re lucky, it could just be an off-kilter fan that needs adjusting, but it’s best to assume the worst and not delay in getting service. 

If Your Air Conditioner Buzzes or Rattles

This could also be a loose fan, but dirty coils or other parts that just need tightening are other possibilities. In any case, it’s time for service.

If Your Air Conditioner Hisses or Whistles

This is most likely either a problem with your ductwork, such as a small leak allowing just enough air through to cause a funny noise, or some damage to your coils that are allowing refrigerant to leak. Either of these can be repaired, but as refrigerant continues to be lost, your air conditioner will become inefficient and ineffective, costing you more to do the job.

If Your Air Conditioner Squeals or Screeches

This is most likely the belt, either tearing, coming loose, or wearing out. Prompt repairs can prevent the belt from coming all the way loose and flapping free, damaging other components.

If Your Air Conditioner Clangs or Grinds

This sound tends to be made by the fan motor. Perhaps it has overheated and is struggling to work, or perhaps the ball bearings that keep it turning smoothly have ground down and need to be replaced.

Avoid Future Noises and Repairs

The best way to make sure your air conditioner is happy and healthy is to have air conditioner maintenance in Virginia, MN performed every year. Your technician will clean, inspect, test, and lubricate the components of your AC unit, ensuring that it will run smoothly. And when an air conditioner is maintained every year, 85% of potential repairs can be avoided!

Reach out to Mesaba Heating & Air Conditioning today. Service to you is success to us!

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