6 Common AC Noises You Shouldn't Ignore

An AC repair technician working on an air conditioning unit in a home as a smiling woman watches.

What's that strange sound coming from the AC? You can tell something is not functioning as it should be. You know how to use your air conditioner, how to clean it, and how to maintain it, but not how to fix it. 

 

An air conditioner will make a familiar noise when it's turned on and off. It might even emit a humming sound during the summer seasons if you live in St. Lucie, Indian River, or Martin County, Florida. 

But, which AC noises shouldn't you ignore? Here are six AC noises that should be cause for you to contact a professional AC repair technician.

6 Common AC Noises you Shouldn't Ignore

1. Hissing Noise

Most of us are not experts on household appliances and technology. However, a refrigerant leak can cause a hissing noise. Refrigerant leaks can occur in either a coil or line inside the AC unit. The hole can cause inefficient cooling, and the chemical emitted by the unit can be dangerous to your family. If you suspect any leaks, contact our professional technicians right away if you hear any hissing sounds coming out of your air conditioning unit.

2. Rattling Noise

A rattling noise inside the AC unit can be very annoying. It's also a sign that there's something wrong with the functionality of your air conditioner. A single worn fan blade might be the cause of a rattling sound. However, worn fan blades will cause AC problems. Another factor that can contribute to the rattling noise is loose screws or bolts. The loose screws and bolts can decrease your unit's lifespan and performance.

3. Clicking Noise

It's normal for an air conditioning unit to make a single clicking sound every time it starts up. However, you should get in touch with our professionals if there are constant clicking sounds. The clicking noise can be caused by:

An Obstruction - If you hear a clicking sound that starts slow but builds up over time, there may be something damaging your unit's blower fan.

The Compressor - There could be a problem with the compressor if the clicking noise is emitting from outside your home.

Electrical Problem - The noise might be caused by an electrical problem if the unit is making a continuous clicking sound but won't turn on.

4. Buzzing Noise

There are a lot of issues that can contribute to a buzzing noise. You likely hear the results of:

  • One or multiple loose fan blades
  • A dirty condenser coil
  • Loose parts (either screws or bolts)
  • An insecure fan motor
  • Debris inside the unit

These issues should be left for an AC professional to fix. 

5. Squealing Noise

A high-pitched squealing noise is a bad sign. We recommend switching off the unit right away and calling a professional service technician. The sound can be due to malfunctioning outdoor fan motors or misaligned fan belt, which needs to be handled right away.

6. Whistling Noise

If your ductwork is leaky, it'll produce a loud, whistling sound. Worn or improperly installed seals might cause your AC's ductwork to malfunction. Have your ductwork checked out and repaired for an efficient functioning unit.

Your AC should provide reliable, quiet, and enjoyable cool air at all times. If your unit emits any noise listed on this list, it's best not to avoid it and just hope it'll go away. 

American Air Cares provides exceptional air condition troubleshooting, repairs, and replacements services. Don't hesitate to contact American Air Cares if you can't figure out what's causing the noises in your air conditioner. Call on the experts for any queries regarding your AC system or to schedule an appointment today!