Soundproofing Window AC

Are you tired of the constant noise pollution from outside interfering with your daily activities and peaceful rest? Or perhaps you’re struggling to concentrate on work or study with the distracting sound of your window air conditioner? If so, you’re not alone. Many individuals face similar challenges and are searching for a solution. Luckily, soundproofing your window air conditioner is a viable option that can greatly improve your quality of life.

How to soundproof window AC? To minimize noise from a window AC, consider using soundproofing materials such as acoustic foam, mass loaded vinyl, or soundproof curtains. Cover the AC unit with these materials and use acoustic caulk to seal any gaps or openings. These simple steps will help create a quieter, more comfortable indoor space.

In this blog, we’ll explore the benefits and practical tips for soundproofing your window AC, helping you create a more serene and enjoyable living environment.

Types of Noise

Types of Noise

Soundproofing a window AC can be a daunting task, especially if you live in a noisy neighborhood or near a busy street. However, before diving into soundproofing techniques, understand the different types of noise that your AC unit might produce. By doing so, you can pinpoint the source of the noise and take the necessary steps to minimize it.

There are several types of noise that a window AC unit can produce, including mechanical noise, aerodynamic noise, and vibration-induced noise.

Mechanical Noise

Mechanical noise is the sound produced by the moving parts of the AC unit. This can include the compressor, fan motor, and other components. Mechanical noise is typically a low-frequency noise and can be quite loud.

To reduce mechanical noise, you can use soundproofing materials like acoustic foam or mass loaded vinyl (MLV) to dampen the vibrations produced by the moving parts.

Aerodynamic Noise

Aerodynamic noise is caused by the movement of air through the AC unit. This type of noise is typically a high-frequency noise and can be caused by a variety of factors, including the design of the unit, the speed of the fan, and the placement of the unit.

To reduce aerodynamic noise, you can install a noise-reducing air filter, adjust the fan speed, or install the unit in a location where there is less air movement.

Vibration-Induced Noise

Vibration-induced noise is caused by the AC unit vibrating against the window or wall it’s installed in. This type of noise can be particularly annoying because it can produce a low-frequency hum that can be felt as well as heard.

To reduce vibration-induced noise, you can use rubber pads or isolators to separate the AC unit from the window or wall. This will help to reduce the amount of vibration that is transmitted to the surrounding area.

Soundproofing Materials

Soundproofing Materials

If you have a window air conditioning unit in your home or office, you know that they can be quite noisy. The constant humming and whirring of the AC can be distracting and disruptive, especially if you’re trying to concentrate or relax. Fortunately, there are several soundproofing materials that you can use to reduce the noise coming from your window AC unit.

Acoustic Foam

Acoustic foam is a popular soundproofing material that is often used in recording studios, concert halls, and other spaces where noise reduction is important. This foam is made of a special type of polyurethane that is designed to absorb sound waves.

When sound waves come into contact with the foam, they are converted into heat energy and dissipated, reducing the amount of noise that reaches your ears.

Acoustic foam can be easily installed around your window AC unit using adhesive strips or glue. It is also available in a variety of colors and thicknesses, so you can choose the type that best suits your needs.

Mass Loaded Vinyl (MLV)

Mass loaded vinyl, or MLV, is another effective soundproofing material that is commonly used to reduce noise in homes and buildings. This material is made of a heavy, dense vinyl that is designed to block sound waves from passing through walls, floors, and other surfaces.

MLV is easy to install and can be cut to fit the size of your window AC unit. It is also waterproof and heat-resistant, so it can withstand the elements and the heat generated by your AC unit.

Weatherstripping Tape

Weatherstripping tape is a simple and affordable soundproofing solution that can help reduce the amount of noise coming from your window AC unit. This tape is made of a flexible, adhesive material that can be applied to the edges of your window to create a seal.

By creating a tight seal around your window, weatherstripping tape can prevent sound waves from entering or escaping your space. It is also effective at reducing drafts and improving energy efficiency, making it a smart investment for any home or office.

Anti-Vibration Pads

If your window AC unit is causing vibrations that are contributing to the noise, anti-vibration pads can help. These pads are made of a special rubber material that can absorb the vibrations generated by your AC unit, reducing the amount of noise that is transmitted through the walls and floors.

Anti-vibration pads are easy to install and can be placed under the feet of your window AC unit. They are also durable and long-lasting, so you can enjoy the benefits of reduced noise for years to come.

Step by Step Soundproofing Window AC

Step by Step Soundproofing Window AC

If you live in a noisy neighborhood or work in a bustling office space, you know how distracting and disruptive outside noises can be. Window air conditioners are one of the common culprits of noise pollution.

With some basic soundproofing techniques, you can significantly reduce the noise that enters through your window AC unit. Here is a step-by-step guide on how to soundproof your window AC unit effectively.

Step 1. Inspecting and identifying noise sources

The first step in soundproofing your window AC unit is to identify the sources of the noise. Start by inspecting your window AC unit and the surrounding area for any visible signs of wear and tear or loose components.

Sometimes, the rattling or humming sound may be due to loose screws or faulty parts. Other times, the noise could be coming from the outside environment. Identifying the noise sources will help you determine the most effective soundproofing techniques to use.

Step 2. Cleaning and tightening loose components

Once you have identified any loose components or worn-out parts, it’s time to clean and tighten them. Use a screwdriver to tighten any loose screws or bolts that hold the AC unit in place. Also, make sure to clean the filter and other components regularly to prevent dirt and debris from clogging the unit and causing more noise.

Step 3. Applying weatherstripping tape

Weatherstripping tape is a great way to soundproof your window AC unit by sealing any gaps or cracks around the unit. This tape is usually made of rubber or foam and is easy to install.

Simply measure the gaps between the unit and the window frame and cut the tape to size. Then, apply the tape to the gaps, making sure to press firmly to create a tight seal.

Step 4. Installing mass loaded vinyl (MLV)

Mass loaded vinyl (MLV) is an effective soundproofing material that can help reduce noise transmission from your window AC unit. This material is made of dense layers of vinyl, making it an excellent sound barrier.

To install MLV, measure the dimensions of your window AC unit and cut the MLV to size. Then, use adhesive to attach the MLV to the wall surrounding the unit.

Step 5. Adding acoustic foam

Acoustic foam is another effective soundproofing material that can help absorb sound waves from your window AC unit. This foam is usually made of polyurethane and comes in various shapes and sizes.

To install acoustic foam, measure the dimensions of your window AC unit and cut the foam to size. Then, attach the foam to the wall surrounding the unit using adhesive.

Step 6. Placing anti-vibration pads

Placing anti-vibration pads under your window AC unit can help reduce the noise that comes from the vibration of the unit. These pads are made of rubber or foam and can absorb the vibrations, preventing them from transmitting to the surrounding walls and floors. Simply place the pads under the unit, making sure they are level and secure.

Alternative Solutions

If you’ve tried all the basic soundproofing methods and your window air conditioner is still causing unwanted noise, don’t worry. There are alternative solutions that can help you reduce the noise and make your room more comfortable.

Upgrading to a Quieter AC Unit

One of the most effective solutions is to upgrade to a quieter AC unit. Older models tend to make more noise, and if you’ve had your window AC for a while, it may be time for a replacement. Look for models with a lower decibel rating, as these are designed to operate more quietly.

You may also want to consider purchasing an Energy Star-certified unit, as these tend to be more efficient and produce less noise.

Installing a Mini-Split Air Conditioner

If you’re willing to invest a bit more money, installing a mini-split air conditioner is another option. These units are designed to be mounted on walls or ceilings and can be connected to an outdoor compressor.

Unlike window ACs, mini-splits are much quieter and can provide zoned cooling for individual rooms. They also tend to be more energy-efficient, which can save you money in the long run.

Using Soundproof Curtains or Blinds

If you’re not ready to replace your window AC or install a mini-split unit, using soundproof curtains or blinds can help reduce noise levels. These curtains and blinds are designed to absorb sound waves and prevent them from bouncing around the room.

They can be hung over your existing window treatments and are available in a variety of colors and styles to match your decor. Just be sure to choose curtains or blinds that are specifically designed for soundproofing, as regular curtains or blinds won’t be as effective.

Maintaining a Soundproofed Window AC

Maintaining a Soundproofed Window AC

If you have invested in soundproofing your window AC, you know how important it is to maintain it properly to ensure it continues to function effectively. Regular maintenance and upkeep of your soundproofed window AC will help you get the most out of your investment and ensure it operates quietly and efficiently.

Following are some important steps to maintain a soundproofed window AC.

Regularly inspecting and cleaning the AC unit

Regular inspection and cleaning of your window AC unit are important to ensure it operates efficiently and quietly. Over time, dirt, dust, and debris can accumulate on the unit’s surface, reducing its efficiency and increasing noise levels. Here are some steps you can take to keep your soundproofed window AC clean:

  1. Turn off the unit: Before cleaning your window AC unit, turn it off and unplug it from the power source.
  2. Clean the exterior: Use a soft cloth or a brush to remove any dirt or debris from the unit’s exterior. Be gentle to avoid damaging the soundproofing materials.
  3. Clean the filters: Remove the air filters and clean them with a soft brush or by running them under water. Make sure the filters are completely dry before reinserting them.
  4. Check the fins: Inspect the fins on the unit’s exterior for any damage or debris buildup. If necessary, use a fin comb to straighten them.
  5. Check the drainage: Ensure that the unit’s drainage system is working correctly and is not clogged.

By regularly inspecting and cleaning your soundproofed window AC unit, you can ensure it continues to operate effectively and quietly.

Ensuring proper sealing and insulation

Proper sealing and insulation are crucial to the effectiveness of your soundproofed window AC. If there are gaps or leaks in the seal or insulation, noise can easily escape, and the unit will not be as efficient. Here are some steps you can take to ensure proper sealing and insulation:

  1. Inspect the seal: Check the seal around the unit’s frame for any gaps or leaks. Use weather stripping or caulking to fill any gaps or leaks you find.
  2. Insulate the unit: Use foam insulation to fill any gaps around the unit’s frame or between the unit and the window.
  3. Use a window kit: Consider using a window kit to provide an airtight seal around the unit and the window.

By ensuring proper sealing and insulation, you can help to reduce noise and increase the efficiency of your soundproofed window AC.

Replacing worn-out materials

Over time, the materials used in your soundproofed window AC may wear out or become damaged, reducing their effectiveness. Replace any worn-out or damaged materials promptly to maintain the unit’s effectiveness. Here are some materials you may need to replace over time:

  1. Weather stripping: Over time, weather stripping can wear out, become damaged, or lose its effectiveness. Inspect the weather stripping regularly and replace it if necessary.
  2. Foam insulation: Foam insulation can become compressed or damaged, reducing its effectiveness. Replace any damaged or compressed foam insulation promptly.
  3. Soundproofing mats: Soundproofing mats can become worn out or damaged over time, reducing their effectiveness. Replace any damaged or worn-out mats promptly.


To soundproof a window AC, you can use materials like acoustic foam, mass loaded vinyl, or soundproof curtains. Install them around the unit and seal any gaps or cracks with acoustic caulk. These measures will help reduce noise pollution and create a more peaceful environment.

So, you’ve successfully soundproofed your window air conditioning unit! After putting in the effort to research and implement effective soundproofing techniques, you’re likely eager to assess the results of your hard work.

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Brendan Ratliff
Brendan Ratliff

As a soundproofing and acoustical professional, I have helped new homeowners, builders and remodelers with their projects. I also help contractors/designers learn how to properly install soundproofing in their clients homes.
I enjoy helping people understand the process of soundproofing and acoustical construction. is a one-stop solution for all of your soundproofing related questions.