how to quiet a noisy window air conditioner

A Comprehensive Guide on How to Quiet a Noisy Window Air Conditioner

Let’s face it, air conditioners have become a necessary component of our lives, especially in areas with hot and humid climates. However, as much as we enjoy a relaxed, peaceful night’s rest, we’ve all been in situations where the rattling and buzzing sounds from your air conditioner keep you up all night.

It’s essential to know exactly how to quiet a noisy window air conditioner on such dreadful occasions. Doing so not only helps you from having to deal with hefty technician bills but also allows you to take action promptly.

Common Causes of a Noisy Air Conditioning Unit

Too loud sound.

  1. Just like many other types of equipment, a window air conditioning unit also uses padding to dampen any noises produced. While these paddings may work fine for a few years, they don’t come with an unlimited life span. With time, the padding starts to wear out, or even break down, thus, resulting in loud screeching sounds.
  2. If your AC has been making frequent rattling sounds, then there’s a good chance that a screw or a panel has become loose inside. Leaving it untreated can only cause further problems and issues. Your best bet is to pick up a basic screwdriver and check whether this is the case with your AC.
  3. Another common cause behind a noisy air conditioning unit is the accumulation of dust and debris over time. While, in most cases, a simple vacuum can get the job done, a deep cleaning may be required if the noises continue to pester.
  4. Just like other machines, your window air conditioner is also made of moving parts and motors which need lubrication from time to time. If the lubricants dry out, it can make your air conditioning unit run much louder. Hence part of learning how to quiet a noisy air conditioner involves having a sound knowledge of the lubricants. In case you aren’t aware of how to properly lubricate a window air conditioning unit, try watching a video online. Otherwise, you can also stick to a basic maintenance plan from a professional at least once a year to keep your window AC quieter.
  5. While a slow buzzing, clicking, or humming may not be a cause of concern, if you hear a loud banging or squealing sound from inside your air conditioner or from part of it, then there’s a good chance that a malfunction causes it. Usually, malfunctions are not easy to deal with and require an expert to take care of the necessary repairs.

Apart from these, other difficult-to-tackle causes may include:

  • Leaking refrigerant
  • Tight condenser fan
  • Forming of ice
  • Broken thermostat
  • Weak air circulation

Easy Fixes and Hacks for Learning How to Quiet a Noisy Window Air Conditioner

Annoyed and Angry Woman Shut Ears because window ac is too loud

Watching Out for Gaps

One of the most common reasons why your AC is making all those squeaky noises is because of the gaps along the sides of the air conditioning window unit. While manufacturers provide sliders to fill these gaps, these may only sometimes do the job.

Replacing these sliders with foam insulation has proven to be a much better way to silence a noisy AC while keeping all the cool air inside.

The gaps between the base of the air conditioner and the window frame can also lead to awkward clicking, vibrations, and other loud noises. This could leave you tossing and turning throughout the night.

To avoid these undesirable noise issues, try to support the weight of your air conditioning unit by fitting brackets, rails, or even mounting concrete slabs to secure the AC and keep it upright instead of tilting.

Leveling It All Up!

Another important aspect to watch out for when learning to quiet a noisy window air conditioner is to observe whether your air conditioning unit is leveled. In contrast, most of us assume that our window AC is perfectly level, but this is only sometimes the case. Even minor bumps or tilts can lead to unwanted sounds and problems in the future.

The best way to deal with this issue is by using a leveling instrument. Doing so ensures your air conditioning unit’s functionality and allows you to enjoy a quiet, peaceful, cool environment.

Good Insulation Matters!

Is the seal around your window frame in good condition? Is it providing proper insulation to your air conditioning unit?

Knowing the answers to these questions is important if you want to learn how to quiet a noisy window air conditioner. Regarding insulation, many experts and technicians advise that good insulation requires your window air conditioners to run for shorter periods with breaks every now and then. This process will keep the mechanism cool.

Furthermore, to properly insulate the outer rims, try using foam strips and notice how quickly the air conditioning unit silences. While checking for insulation, try inspecting the window itself as well.

If your window hasn’t been replaced in a long time, chances are that panes are vibrating or the window frame may be splintered. If this is the case, you will need a window expert who can find cost-effective ways of replacing your old windows.

Cradling the Compressor With a Sound Blanket

Another critical aspect to consider when learning how to quiet a noisy window air conditioner involves looking out for your AC’s compressor. Installing a sound blanket around your air conditioning unit’s compressor is a great way to manage its longevity and reduce the noise that may come out of the compressor, all without compromising on its efficiency.

However, if you are regularly experiencing a humming sound, it’s best to call in an expert to install the sound blanket properly. Doing so will keep the AC unit from overheating and prevent any dust or dirt from getting inside the machine, all while keeping the air conditioner quieter.

Keeping Up With Regular Cleaning

The number one reason why most window air conditioner units start to emit strange rattling, squeaking, or even buzzing sounds is because of the dirt and dust that accumulates inside them over time. These particles, with time, end up clogging the machine. This exposes homeowners to an allergen-filled environment. To steer clear from this, removing and washing the filters at regular intervals is important, thus keeping the airflow clean.

Additionally, the external coils, gaps between the fins, and the exterior body must be cleaned regularly to avoid buildups and unwanted noises. Several videos online teach you how to clean your air conditioning unit deeply and keep up with routine maintenance. However, while doing so, make sure that you disconnect your window air conditioner from the power source first.

Replacing It Altogether

Sometimes, fixing a noisy air conditioning unit is a lot tougher than expected. This usually happens when your AC has been around for too long or has not received regular maintenance. As a result, the cost of repairs ends up being far too costly, and you know that it’s time to buy a new window air conditioning unit.

However, while doing so, try to survey the market first. Consider factors like durability, performance, and after-sales services as well as price, and choose a quality window air conditioner.

Tips for Maintaining Your Air Conditioning Units

Single electrician man clean, fix and maintain air conditioning

  1. Make sure that your air conditioning unit is aligned and centered on the window instead of being placed in a slanted position.
  2. Seal the gaps between the window and the AC unit to avoid any humming sounds.
  3. Check the fan blades to see if they are adequately tightened. Loose fan blades continue to rub against the interior resulting in a noisy window air conditioner.
  4. Check if the fan blades are damaged. If so then you may have no other option but to replace it.
  5. Inspect the AC motor to see if it is working properly. If the blades are spinning slower than usual, chances are that the AC might be damaged. If this is the case, you may need to hire a professional to fix or replace it.
  6. Wash and vacuum the air conditioning unit every two weeks or so to keep your air conditioner quieter.
  7. Allow your air conditioning unit to rest from time to time.


While a noisy window air conditioning unit can leave anyone feeling unnerved, there are tips one can learn regarding how to quiet a window air conditioner.

From a bit of vacuuming to tightening screws occasionally and even lubricating the parts – knowing and practicing the tips mentioned above can help you maintain your AC’s health. Remember! A good, well-maintained air conditioning unit can last as long as 20 years.

Leave a Comment

Your email address will not be published. Required fields are marked *