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Acoustic Grade Window Inserts

Window Soundproofing Made Easy

Reduce outside noise from trains, traffic, or your neighbor’s barking dog with acoustic window inserts. Like other Indow grades, Acoustic Grade inserts simply press into existing window frames. These indoor storm windows seal out drafts and save energy, with the added bonus of blocking up to 70% of outside noise.*

With no hardware required, Indow inserts don’t damage the existing window. This makes them a great choice for historic windows, new homes, and rental homes for noise reduction without window replacement. Indow inserts make noise canceling easy without the hassle and expense of installing soundproof windows!

Person installing Indow Acoustic Grade inserts to soundproof their home from outside noise

How Do Acoustic Window Inserts Work?

Acoustic Grade inserts are an extra layer against sound vibrations – they are sound deadening storm windows for the interior. The deeper the window frame, the bigger the air pocket between insert and window—the better the performance. All window measurements are entered through our Measure by Indow software, which instantly verifies measurements for a precise fit. Our sound blocking window inserts create a tight seal that block noise entering through cracks.

ACOUSTIC INDOW INSERT + SINGLE-PANE

Diagram of Acoustic window inserts with single-pane windows. Reduce noise by 70%.

REDUCE NOISE UP TO 70% (18.9 DBA REDUCTION)

ACOUSTIC INDOW INSERT + DOUBLE-PANE

Diagram of Acoustic window inserts with double-pane windows. Reduce noise by up to 50%.

REDUCE NOISE UP TO 50% (10.2 DBA REDUCTION)

Indow's custom Acoustic Window inserts are:

  • Nominal ¼” thick acrylic glazing, double the thickness of Standard Grade.
  • Edged in Indow’s patented silicone compression tubing.
  • Made in three different colors - warm white, brown and black.
  • Available in custom shapes like arches, rounds and eyebrows.

Window inserts for soundproofing are versatile and can be used in a variety of settings such as bedrooms, nurseries, home recording studios, workout/dance/art studios and offices. Establishments such as hotels, churches, yoga studios, government buildings and museums as well as rental property managers have all used Indow inserts to reduce outside noise. To better understand how sound enters a space, check out our home soundproofing guide.

Testimonials About Indow Window Inserts for Sound Reduction

Instead of relying on our word, read what our customers have to say about how our window inserts improved their lifestyle. For example, our client Maggie installed Acoustic Grade in several rooms to block loud traffic noise. The reduction was dramatic, and she loved how she couldn’t even see the inserts.

“It’s made a huge difference,” said Maggie. “Unless you know they’re there, you don’t know they’re there.” Read more case studies like Maggie’s on how we help customers find comfort, quiet and savings in their home or business.

How Indow's Window Noise Reduction Performs:

  • Reduces noise by 18.9 dBA (a more than 70% reduction when placed over single-pane windows.)
  • Reduces noise by 10-12 dBA (a more than 50% reduction when placed over double-pane windows.)
  • STC (Sound Transmission Class) Ratings denote how much noise is blocked by walls, windows and other surfaces. Independent studies have shown Acoustic Grade inserts placed over a double-pane windows yield a STC rating of 42-45.
Explore complete performance data here.

Noise reduction compared to a single-pane window

  • 50-70%

    Indow

  • 25%

    Replacement Windows

*We want to ensure our inserts help solve your noise problem. Overall noise reduction depends on the amount of noise coming through your walls, ceilings, floors, doors, and existing windows. Noise reduction will be less when placed over double-pane windows. Read our full Noise Reduction Sheet to learn more.

What Do They Cost?

Consider the cost and disruption of replacing your windows. A vinyl window averages $66-$87/sf. A wood window averages $71-$109/sf. With Indow inserts averaging between $31-$44/sf MSRP, your window project can cost a fraction of other options.

Standard Grade

$31/sf or just $372 for an average window

Our workhorse interior storm window insert blocks drafts and reduces outside noise.

Performance Grade

$40/sf or just $480 for an average window

Our 4 options in performance grade inserts provide superior protection against noise and light.

Commercial Grade

$44/sf or just $588 for an average window

Industrial strength inserts with a scratch-resistant coating can be cleaned with common products.

When you measure your windows, you’ll have help at every step. First, we have a library of video and written tutorials available. Second, our amazing team is always ready to take your call if you need assistance. Third, our proprietary measurement software will automatically check your measurements as you enter them to ensure a tight, snug fit for your customer window inset.

*Sales tax may apply

Our Pricing Calculator is currently unavailable. Contact us to discuss pricing.

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bedroom with window with Indow inserts installed for soundproofing in San Francisco

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Fill out this form and one of our Comfort Experts will be in touch to prepare a specialized estimate for your space.

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Customer Reviews

Excellent

4.49 Average 1458 Reviews

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cynthia g

Great product, well made. Helpful staff and great communication

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Anonymous

The window fits perfectly and was easy enough to install by myself. It unfortunately does not reduce much noise, if any at all, from outside, that might be something for the more premium versions. I have noticed that it does help keep in warmth however which is nice.

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Laura K

They are wonderful and are keeping out the cold air this fall!

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Travis P

I love my Indow inserts! The installation was very simple and the Indow team helped me the entire way. I live near a busy road, an interstate, and an airport. Although not unbearable the noise from those aforementioned sources was noticeable (key word "was" :) ). I am so glad I found Indow because their inserts were affordable, not permanent, and easy to install. The Indow inserts significantly reduced the noise! I don't have official measurements but I'd say the inserts cut down at least 50% of the noise which is a huge improvement!

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Imogene S

I am a 78-year-old woman and the windows in question are above two sliding glass doors. All 4 are almost 3'x4' in size. I had absolutely no problem ordering and installing them myself. The Indow rep I worked with initially answered all my questions. Indow helped all the way with the measurements, delivered the indows early, and provided detailed instructions on their installation. My only advice to potential customers is to measure thrice and order once. The key to successful inserts is a perfect fit - with the Indow-supplied laser, you can do it!

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Tony H

Great quality & service. Inserts are a good fit. Will be able to give better feedback after we have been hit by severe winter weather.

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Rex R

Great product, fit and finish was high quality. The difference of road noise was amazing. I rarel. Hear vehicles any more. Before it sounded like they were going to drive theough the wondow. Great invention!

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Sally B

The inserts weren’t too difficult to place and have made a huge difference in reducing outside highway noise. Love that they are barely noticeable once in place so don’t detract from the window view or appearance at all.

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Anonymous

Wow! A company that is honest and transparent about their terrific product. Thank you! Received my window inserts this morning. They work well cutting road noise dramatically. Easy to install. But most of all doing business with them has been an uplifting pleasure. Warms my heart to see honest,dedicated people making the world a more peaceful place!

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Carol K

From start to finish, working with Indows has been a great experience. They made sure that the measurements I took were accurate so that the finished product fit perfectly. The Indows, definitely reduce the sound out on the street. In a small guest room inn our Inn in San Francisco, the need to open the window and air out rooms is a necessity so we will see how suitable the inserts are in the long run.

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Mary B

I am very grateful to have found and purchased Indow dor several problematic windows in my 1909 house. Wanting to retain the stained and other leaded design windows but making them more weather efficient, Indows solved the problem. I just popped them in and viola! Service was also terrific. I do have to adjust the seal occasionally on one of the picture windows but it is no problem.

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Miriam L

Our 9-pane living room window was letting cold air in, so we purchases 9 Indow Window panels. They were fairly easy to install and have held up for a few years now. They make a huge difference in comfort in the living room. Great idea you had there!

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Sam P

The ordering process was smooth and easy. Window arrive we'll packed and clean. Installation was easy but the safety chains make no sense.

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Tamara S

I work five nights a week and keep night hours on my days off, so having a pitch-black room is essential to my health and happiness. After reading some reviews I settled on the Indow sleep panels. My house was built in 1901. I have two bedroom windows that are about 6' tall and 3' wide. From the time I got in touch with Indow, through the measuring process, through the production and delivery of my inserts I felt like they were supportive. Reading the installation guide before their arrival was essential in preparing me for the process. I knew I'd need to install window brackets with a power drill and that unboxing the inserts might be a bit of a chore. This made the installation process smooth which I greatly appreciated. The inserts arrived a few hours after I'd worked through the night, so I was ready to get them installed in short order and get to sleep at a reasonable hour that day. As to their efficacy, the panels block all the light. The sound dampening isn't powerful, but I knew that going in as well. The inserts need to sit 4" from the glass for the full dampening effect and mine can only sit at about 2". There is a dampening effect, just not at the 50% noise reduction that they're capable of. The delivery service that shipped to my house didn't call to schedule the delivery as the instructions said they would. That's the only thing that didn't go according to plan, but I was home so it worked out. Other than that one thing, the panels perform as I hoped they would. I'm grateful for my dark room and my consistent deep sleep because of them. I would work with Indow again in the future.

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Gregory B

We love our new inserts. All nine fit perfectly in our varied windows and now we can enjoy a warmer and quieter winter. Indow was fantastic to work with through the entire process. Thank you, Indow!

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Indow window insert compression tube color samples.

Customize Your Insert

Each insert has a tube that edges the clear acrylic. This tubing should blend into your window frame. It comes in three colors: white, brown, and black.

All our acrylic interior storm windows are durable, lightweight and made to blend seamlessly with the surrounding frame. Don't buy new windows. Make the ones you have just right with our precision measuring software, which will ensure a tight fit for your new window inserts. Just choose the grade you need and get started measuring. We're here to help at every step.