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How to Quiet a Noisy Air Conditioner

December 22, 2018 Colman Heating & Air

A lot goes on within your air conditioning system. With so many moving parts (literally), it’s only normal for it to make noise – it is machinery after all! But if your air conditioning system is reaching new decibels, something may be off behind the scenes.

There isn’t a one-size-fits-all answer when it comes to why your air conditioner is making so much noise. But the best course of action you can take is to identify what type of noise your system is making, which can reveal the underlying cause.

Keep reading to learn how to decipher different noises coming from your air conditioner as well as how you can quiet a noisy AC.

Why Is My Air Conditioner So Loud?

Reason #1: Your air conditioning system is too big for your home
If an air conditioner is too big for the home it’s in, it will force more air through the air ducts than they can handle. As a result, a loud, forceful sound of air moving will likely occur when the system kicks on.

While this might not seem like a big deal, an air conditioner that is too big for your home comes with a few problems. For starters, the system will turn on and off frequently, resulting in higher energy bills and a less comfortable home.

Solution: Your best bet is to replace your air conditioning system so it is sized correctly. We realize this is a big investment to make, but our technicians can provide a professional assessment and help walk you through the process.

Reason #2: Your home’s air ducts are the wrong size or poorly designed
When the air ducts are the wrong size or poorly designed, air velocity inside of the unit can increase. Increased air velocity means more noise.

Improperly sized and designed air ducts can affect your home’s overall comfort, making it stuffy all while promoting mold growth too.

Solution: If you think your home has improperly sized or designed air ducts, have a technician inspect your system. They will be able to determine if the air ducts need a redesign or a simple repair.

Reason #3: Your air conditioning system is old
Older air conditioning systems were built without noise-reducing features so they tend to be louder. As systems age, parts begin to wear out, resulting in an overall noisier function.

Solution: Depending on how old your current air conditioning system is, you may want to look into investing in a new one. We recommend reducing your system if it has a SEER rating of less than 10, uses R-22 refrigerant, or if your electricity bills are high.

Other Air Conditioning Noises to Watch Out For

No air conditioner is completely quiet, but if you feel like your AC is louder than it should be, there may be an underlying issue. Some noises in fact, might require immediate attention. Take a look at some of the most common AC noise and what they could mean.


Rattling likely means there is a loose component (think: a bolt, fastener, nut, or screw) moving about within your AC unit.


Hissing likely means there is a leak within your AC unit. This can include a ductwork issue or even a refrigerant leak.


Grinding may occur if the condenser motor is bad. Grinding is almost always a sign that you should turn your AC off to prevent further damage and call your technician.


Buzzing likely indicates an electrical issue. If the noise occurs when switching to a different setting, the issue is probably isolated to one part. On the other hand, if the buzzing is constant, it could mean there is an issue with the wiring.

Bubbling or Gurgling

Bubbling or gurgling usually indicates a condensate pump issue. When the condensate pump malfunctions, water from within your AC unit won’t drain effectively. This can cause water to build up, resulting in the noise.

Squealing or Squeaking

Squealing or squeaking likely means that the fan belt has come loose and will need to be readjusted or replaced.

Other Ways to Quiet a Loud Air Conditioner

Looking for more ways to quiet your air conditioner? Here are a few things we recommend you try.

Find the Underlying Cause

It’s hard to quiet your noisy air conditioner if you don’t know why it’s noisy in the first place. That’s why we recommend all homeowners dealing with this issue try to find the underlying issue. Is your system making any of the noises above? If so, which one? Narrowing down where the noise is coming from and what type of noise your system is making can help you determine if the noise is caused by an underlying issue.

Install a Mounting Pad

Mounting pads can be placed between the outside unit and the concrete base it sits on, preventing noise from vibration.

Purchase a Sound-Blocking Fence

Sometimes your AC unit is placed too close to a room, causing it to be less than relaxing. A sound-blocking fence installed around your outdoor unit can help defect noise away from your home.

Don’t Skip Maintenance

Routine maintenance checkups with your trusted technician is an easy way to ensure your system is working as it should and not making excess noise.

Let the Experts at Colman Air Quiet Your AC System

Your air conditioning system may make your home comfortable, but if it’s creating too much noise in the process your home will be anything but. If your loud AC is driving you mad, we’re here to help. Contact us today to have us pinpoint the right solution for your home. Call us at (321) 360-7566.

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Colman Heating & Air 1001 Tropic St Titusville, FL 32796

(321) 360-7566 License #: CAC058313

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