How To Quiet A Noisy Window Air Conditioner: 5 Easy Ways

Written by Michael Harris
Last updated

A window air conditioner can be a great way to keep your home cool during the hot summer months. However, these units can also be quite noisy, making it difficult to enjoy the benefits of a cool home without being constantly reminded of the appliance’s presence.

But, thankfully, there are a few easy ways to reduce the noise coming from your window air conditioner and in this post, we’re going to walk you through how to diagnose why your air conditioning unit is so loud and how to fix it. Let’s get started.

Why Is My Window Air Conditioner So Loud?

In case your house lacks a central air conditioner, a window air conditioner is an excellent way of helping to keep your home fresh.

These window AC comes as a complete unit and they are typically mounted on the window to bring out that cool breeze in the house, especially during hot days.

The most beautiful thing about these window AC conditioners is that installation is quite more comfortable when compared to the central air conditioner.

One of the biggest issues with these windows AC is that they tend to make noise sometimes and this can be quite irritating.

Here are some of the reasons why your window air conditioner tends to be so noisy. Let’s find out:

1. The entry of Foreign Materials

These window AC have a rotating fan inside, and it tends to mesh on the sides to allow a fresh breeze to circulate in the house.

However, the openings and the location of the AC around the window make it susceptible to the entry of foreign objects like leaves and other debris.

These foreign objects happen to be the reason why you will start hearing some noise coming from your AC.

Sometimes even the rats or lizards can get trapped inside the AC, making it difficult for the fan to rotate hence start making disgusting noise.

2. Bends on the Fan Blades

The blades tend to be straight and flat to ensure they rotated inside without touching the housing case of the AC. However, the entry of foreign objects make the blades to bend, and this makes them hit the housing case of the AC as they rotate.

The frequent hitting while the AC is working results in some noise that can even deny you an opportunity to have a sound nap on the sofa.

3. Window Frame Vibration

Window AC is usually mounted on the window frame, and it tends to experience a lot of moving parts after plugging in on the power supply.

If the AC is not mounted correctly on the window frame, the vibrations can even force it to fall after some time. Also, the excessive vibrations can even make the window frames to be weak, and this will always result in squeaking sounds as the AC performs its duty.

4. Loose Front Grill

Many modern window air conditioner has a removable front grill to make it quite easy for cleaning and removal of dirt.

However, these front grills tend to have simple locking mechanisms that sometimes become loose after exposure to excessive vibration.

Loose front grill will always make noise whenever the window air conditioner is connected to the power to cool the house.

5. Inadequate Lubrication

The window air conditioners are fitted with fan motor so that the blades can easily rotate without facing any challenges.

New AC has fan motors that are well lubricated, and this is the reason why they do not make any noise as they rotate the blades.

However, old AC, which has worked for over some decades tend to experience corrosion in the fan motor. This will result in frictional sounds that are disgusting when they play a role in the house.

Different Types of Window AC Noises and their Meaning

There are various reasons why your window AC makes a lot of noise, and most of them are related to the cause. Here are the possible types of window AC noises and their respective meaning:

Grinding Noise

This type of sound coming from your unit can even force you to shut it down since it is quite irritating. The noise comes as a result of a failed condenser motor.

The bearings need to be replaced or repaired. Sometimes, it could be due to broken fan blades which keep on touching the housing case as they rotate.

Humming Noise

The noise is possibly due to the excessive accumulation of dirt or dust in the AC unit. The dirt or debris inhibit the fans from functioning correctly, and this is the reason why it is recommended to clean them regularly.

Buzzing Noise

Buzzing sounds irritates the ears, and the noise can deny you an opportunity to grab a novel and start reading. The kind of noise emanates as a result of an electrical fault.

The issue can interfere with the settings on the control panel of the unit, causing the buzzing sound. Sometimes, loose parts and motor problems of the unit can result in loud buzzing noise that can force you to shut it down.

Screeching Noise

The noise occurs as a result of excessive buildup of pressure that is trying to escape the compression in the unit. It is recommended to turn off the AC unit and call an expert to come to fix the problem or else the problem will reoccur again.

Rattling Noise

The Rattling noise is an indication that your AC unit has loose nuts, bolts, or any other small parts that require fastening. It is recommended to try twisting these parts with a screwdriver to tighten them.

Squealing Noise

Squeaky noise is so irritating, and if you notice your unit producing such sound, then it is possibly due to a loose fan belt. Unfortunately, you cannot repair it at home alone unless you are an expert.

Clicking Noise

This is the most dangerous noise type that needs to be handled with care and possibly immediately. The noise comes as a result of an electrical connection.

Loud Whistling

Whistling noise mainly emanates from the air vent. This usually occurs as a result of low airflow into the vent. The problem typically arises when the air vents are blocked with dirt or dust.

Banging Noise

Banging sounds are quite irritating, especially at night, and this can make you have a sleepless night. It occurs when there is a loose part inside the unit.

Hissing Sounds

Many people are used to catting hissing sounds. If you are a cat owner, then you automatically know what the reason behind cat hissing is.

AC unit also does hiss to imply that there is a leak lurk somewhere that needs attention. This may make your group not to function well in the long run.

How to Quiet a Noisy Window Air Conditioner

Here are the tips on how to reduce noise coming from your mounted window AC unit. The tips include:

Try a Foam Insulation

Mounting these window units usually leaves some gaps on the sides. Most manufacturers offer some slider fillers, which are thin and tend not to work well.

It is recommended to try foam insulation that helps to muffle the noise and also ensure the air inside is cold.

Level the Unit Well

Many people tend to mount the unit and allow it to sit on the window without leveling. This is possibly the typical reason behind the noise.

I recommend you use a level to see if the unit is well fitted on the window to minimize the production of noise as a result of vibration.

Hang a Noise Blanket

Thick Sound-absorbing Blankets are some of the most common soundproofing techniques to adopt, especially when living in a noisy neighborhood. It is advisable to hang a blanket a few feet away from the unit to help in blocking unnecessary noise.

Make Some Adjustment

The unit cage tends to rattle at some point. We recommend you make some small adjustments around the cage while mounting it.

Use a small piece of insulation around the gap between the cage and the window.

Purchase a New Unit

Cheaply made AC units tend to be of poor quality since they usually get damaged after a short period. Take your time to do research about the high-quality AC units readily available in the market and purchase a better one.

Bottom Line

Installing and setting up window air conditioners is quite accessible since they do not require much space. It is also quite affordable.

However, the overworking of the unit tends to make some parts to become loose and begin to produce some weird noise.

The weird noise does not imply that your unit has a fault, but it requires some tweaking to restore it to normal function.

The good news is that you can reduce the noise emanating from your system and enjoy a quiet environment.

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About The Author

Hey I'm Michael and I run this website. I'm a professional voiceover artist and in my search to create a silent studio I've become obsessed with soundproofing and things being quiet. Thanks for visiting and if you have any question get in touch.