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AC makes noise – 7 Causes & How To Fix it 2024

AC makes noise – 7 Causes & How To Fix it 2024

AC makes noise – 7 Causes & How To Fix it 2024

It is likely malfunctioning if you hear loud buzzing noises from your air conditioner. Typically, the issue is either loose parts, missing or broken isolation feet, refrigerant leaks, or a malfunctioning compressor.

I have a portable window mount ac set up. Sometimes, it runs okay, and sometimes, it makes a lot of noise. I’ve tried to fix the noise from my AC, but it always comes back. I believe it’s caused by excessive vibrating. Do you have any suggestions?

Squealing – If your air conditioner is making a squealing sound, the belt connecting the motor to the blower may have slipped, or the bearings on your condenser fan’s motor may have worn down. Clanking or Banging – The issue is usually the blower assembly or the motor if you hear these sounds from your unit.

Solution: AC makes noise

There are many reasons why an AC makes noise. Sometimes, loose hardware is the culprit. Air conditioner noise could be caused by the refrigerant tubing with a bend that produces rattling because it’s too close to other parts of the air conditioner.

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You can correct this by carefully bending it back into its original place. Look at the unit and see if any loose parts could be banging around, causing the noise. It may be the fan blades have gotten bent over time. To remedy this, bend them back to their original position.

Is your portable AC mounted properly in the window? While the AC unit makes noise and rattles, carefully apply pressure to the window sash and listen for any changes in the sound.

This can be remedied by inserting shims between the air conditioner frame and the sash. Another good idea is to check the screws on the front panel of your air conditioner. If loose, they’ll need to be tightened.

There may be more serious problems that would require a service technician, such as compressor issues. Refrigerant floodback occurs when the liquid enters the compressor crankcase.

This ac noise would usually occur when the compressor starts up. Another issue could be oil leaks causing a low oil level in the compressor, which is probably rare.

It’s most likely how your AC is mounted, causing it to make noise. Experiment with the shims, and I’ll bet it goes away. Remember to unplug it from your electrical outlet before attempting to do any internal work on it.

AC makes noise – 7 Causes & How To Fix it.

1. Banging

Banging is usually a sure sign of a loose or broken part — a connecting rod, piston pin, or crankshaft — inside the air conditioning compressor.

Or your indoor blower is unbalanced. A banging noise may also indicate that your system needs a compressor replacement.

2. Clanking

Clanking is another sign of a loose or out-of-balance part. The parts inside the sealed unit have likely failed, and the compressor itself may have become loose, possibly necessitating a replacement.

This sound can also mean that the indoor blower or outdoor fan and its blades are out of balance and hitting other parts. These issues will only worsen and create bigger problems if ignored.

3. Clicking

Clicking electrical components at start-up and shutdown is a normal part of the system’s operation, but constant or ongoing clicking is not typical.

It could be a sign of a defective control or a failing thermostat. There are a lot of electrical parts in your unit, so it’s critical to pay attention to potential electrical issues as soon as possible before you have bigger issues on your hands.

4. Buzzing

A buzzing noise from your outside unit could mean:

  • Loose parts
  • Debris in either the indoor or outdoor unit
  • The outdoor fan motor is loose or about to fail
  • Fan blades are loose or out of balance
  • The copper lines from outside to inside are rubbing against something
  • The air condenser coil needs to be cleaned
  • The air filter needs to be changed
  • The blower is going bad or out of balance
  • Refrigerant leaks, resulting in your air conditioning freezing up. If it’s conditioning, not cooling, this could be why.

5. Squealing

Blowers and fan noises, such as squeaks, squeals, and rattles, may be transmitted through the duct system. Outdoor fan motors and indoor blower motors squeal loudly when they’re going bad.

The blower wheel and housing will also squeal when they malfunction. For some units, this sound is normal upon start-up.

You should be able to identify whether it’s a sound that the unit always makes or if it’s something new. Looking to purchase a home warranty plan, view:

  • What is a Home Warranty
  • Compare Home Warranty Coverage
  • See what Home Appliances are Covered

6. Humming

A humming sound generally isn’t serious, but it still signals that something inside your air conditioner is off.

Loose parts and refrigerant piping can cause vibration and, if left unchecked, can lead to a more serious maintenance issue.

Sometimes, humming or buzzing noises point to electrical problems. If the compressor hums and refuses to start, there may be an issue with the motor, though loose wiring could trigger this noise, too.

7. Chattering/Rattling

A rattling noise can mean that your AC is deteriorating and some parts are loosening. Another cause could be twigs or leaves that have clogged your system.

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The electrical contractor in the equipment can also make a chattering sound, which can damage other components, including the compressor if allowed to continue.

Another culprit could be the fan, which rattles when loose. Your first line of defence is to check for loose screws or bolts in the unit’s casing, clean condenser coils, and change your indoor air filter.

How to Stop a Noisy Window Air Conditioner in 2024

The most popular type of air conditioning, other than central air, is a window air conditioner. If your home is not equipped with central air conditioning throughout the house, you can use a window air conditioner to cool the house.

Most people like using window air units over floor models because they do not need to be moved from room to room and don’t take up space.

One thing about window air conditioners is that they are noisy. The noise level depends on the type and size of the unit. Noise levels are usually given in decibel ratings.

The higher the decibel, the louder the unit will be. For every 10 decibels increase, the sound pressure increases by a factor of 10.

For example, 50 decibels is ten times louder than 40 decibels and is 100 times louder than 30 decibels.

Many things cause noise in ac units. Some cannot be helped. Each unit has a compressor and fan, which causes the most noise.

Other causes could be maintenance issues such as worn bearings, dirty or rusty fan blades, and basic wear and tear.

Besides basic wear and tear, your unit could be noisy because it is vibrating and not installed correctly.

A unit should not be unbearably noisy. If yours is, you should have it looked at by an authorized service professional.

There are some things that you can check on for yourself. To stop some vibrating, try tightening the screws holding the front panel onto the unit.

You might have bent fan blades, causing your unit to make noise. It shouldn’t be too difficult to bend the blades back into place.

Other places where you may be getting some vibration noise are between the AC frame and the sash or the glass and the frame. Check these out before you call in a service professional.


The present air condition systems are calmer than at any other time. What’s more, we need to ensure yours remains as such. High-productivity AC units consolidate sound-hosing innovation and two-stage (variable speed) blowers to keep commotion levels under 55 decibels.

So, if you hear surprising sounds from your forced air system during ordinary activity, don’t disregard them, as this could indicate that the unit needs a fix or redesign.

Your AC compressor is the part that’s responsible for circulating refrigerant (the liquid/gas that cools your home’s air). Due to normal wear and tear, parts inside the compressor can become loose, creating a loud banging sound as they rattle around inside the compressor’s outer casing.

Overlooking the baffling commotions from your AC can transform minor issues into high costs, as these clamours could flag anything from requiring a straightforward check-up to expensive fixes, as well — as thinking pessimistically about replacing the whole unit.

The sooner you can decide why the commotion and resolve your AC noise issues, the better. At the point when your AC makes a boisterous commotion, particularly shaking clamours, it implies there is something wrong.

The most evident explanation behind this is a weak engine, which makes a shrieking commotion when it turns sour.


An AC Making Noise Often Signals Loose Parts. Loose parts, such as nuts, bolts, etc., often cause loud humming or buzzing AC sounds. The unit is icing up. Cracking and popping noises often involve ice forming inside the unit. This can happen if the temperature is set too low or if it’s not set.

  1. Slipped or Old Belt
  2. Loose Parts
  3. Capacitor or Fan Motor Failure
  4. Duct Leaks
  5. Electrical Malfunctions
  6. Trapped Twigs and Debris
  7. Falling Compressor

Be that as it may, there are different reasons too. At Quality Degree, Inc., we need you to avoid such a situation, which is why we’ve assembled the best seven reasons why your AC may be clamouring.

On the off chance that you do hear noise originating from your AC, make certain to call our gifted AC specialists. We work rapidly and proficiently to guarantee you’re agreeably lasting through the year.

Why is my air conditioner making so much noise?

Air Conditioning Repair in Houston, TX

Every electrical appliance will make a noise. It is valid for the refrigerator, microwave, and air conditioner. However, most late-model central ACs run quietly. If the noise from your air conditioner is becoming irritating, you may have a problem.

It would help if you didn’t have to live with a noisy air conditioner that interrupts your relaxation time or keeps you awake at night. Call a certified HVAC technician to resolve the problem.

airflow problem

When an HVAC technician checks a noisy air conditioner, one of the first things they will consider is the type of noise. A hissing or whining noise could indicate an airflow problem. 

Airflow problems are common on older systems built piece by piece over the years. For example, you may have connected a new air conditioner to older ductwork. 

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Sometimes, these different components don’t work well together. If the duct system is too small, a hissing noise can result from the high volume of air the air conditioner pushes through it. It is also possible that the vents are too small.

Another possible cause of hissing is damaged ductwork. Occasionally, the ducts can develop cracks and leaks. When air escapes through those cracks, it creates a hissing sound. The technician can repair your ductwork to eliminate the sound.

Also, clogged or dirty air filters can sometimes cause noise. It indicates that the filter requires cleaning or replacement.

Noisy Central A/C: Compressor Problems

Sometimes, a defective compressor causes annoying noises in the air conditioner. Compressors can produce all kinds of noises. For example, if you hear a clicking sound when you turn on the air conditioner and the air conditioner doesn’t start, the compressor may have an electrical problem.

 Also, compressors can produce a loud, screeching sound. If you hear this noise from the outdoor unit, the compressor motor may need replacing.

In other cases, the outdoor unit may be making a knocking noise instead of a grinding noise. It could also be a faulty compressor. Due to damage caused by normal wear and tear, the internal parts of the compressor can loosen and vibrate around the casing.

However, it is unnecessary to damage a compressor to cause loud noises. Sometimes, all it takes is lowering the amperage to quiet the compressor.

Engine Problems

A faulty fan motor is another possible cause of the knocking noise coming from the outdoor unit. When a fan motor becomes unbalanced, it can fit inside the outdoor unit and cause irritating noises. Fan motors can experience a similar problem. When a fan motor gets very dirty, it can lose its balance. It can cause it to move and create noise.

Also, it is possible to have engine problems affecting the indoor air conditioning unit. If the noise from your air conditioner sounds like a screeching noise inside the house, the fan motor may be to blame.

 This fan is responsible for drawing hot air from inside the house into the unit to cool it down. The cold air is then blown into the house. However, due to normal wear, the blower fan motor can become damaged over time. Also, the fan belt may be worn. It usually results in screeching rather than a screeching sound.

Unusual AC Noises – Electrical Problems

In many cases, worn components are blamed for the noisy air conditioner. However, sometimes, an unusual sound could indicate an electrical problem. If you hear a buzzing sound in your house, it probably doesn’t mean a bee has entered. 

It could mean that your air conditioner’s electrical system needs attention. Note that a clicking sound may indicate a problem with the system relays. An electrical problem is not something you want to try to fix yourself. Instead, call a certified HVAC technician.

Coolant Problems

Do you hear an unusual hissing sound coming from your air conditioner? A hissing sound could indicate a coolant leak. Refrigerant leaks can also cause your system to turn on more often but not cool your home adequately. You will need an HVAC technician to find the source of the leak, repair it, and recharge your system.

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AC makes noise

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