IndowONE Product Data

Indow window inserts are an acrylic glazing edged with our patented Compression Tube that presses inside a window frame without requiring the installation of a mounting bracket.

Performance DataSingle-pane WindowDouble-pane WindowIndow insert + Single-pane
Sealing Out Drafts & Heat.5 CFM-Very Drafty.1 to .3 CFM.024 CFM
Thermal Insulation (R-Value / U-Value)R-1.0 / U-1.0R-2.0 / U-0.5R-2.3 / U-0.43
(Equivalent to Double-pane)
Noise ReductionBaseline20%-30% Reduction
from Single-pane		50%-70% Reduction
from Single-pane
LeadNo IssuesEPA lead containment regulations applyNo Issues
Visible Light Transmittance74%51% to 81%64%
Solar Heat Gain Coefficient.72.42 to .75.57

Indow insert + single-pane performance numbers are from independent testing conducted by the Attachments Energy Rating Council (AERC). Actual performance will vary depending on the condition of the single-pane window and its frame depth.

Acrylic Types

All types come with Compression Tube color options: brown, warm white and black. Custom colors are available for large commercial orders. Call to inquire.

  • Standard Grade (STD)

    Our baseline product. The clear nominal 1/8" thick acrylic panel provides a great balance of comfort, efficiency, and noise dampening at an affordable price.

  • Acoustic Grade (AG)

    Reduces noise coming through operable single-pane windows by 18.9 dBa, which “feels,” subjectively, like a 70% reduction in noise. Reduces noise coming through double-pane windows by 10 to 12 dBA, equivalent to a 50% reduction. STC rating of 42-45 with double-pane windows. Available in Commercial Grade.

  • Commercial Grade (CG)

    Have an extra abrasion-resistant coating to provide additional protection against scratching (moving and frequent cleaning). Safe to use cleaners such as Windex. There is no visual difference between the Standard, Museum and Commercial Grade acrylic.

  • Museum Grade (MG)

    Protects furniture, carpets, and artwork by filtering 98% of all UV rays from sunlight coming through windows. There is no visual difference between the Standard, Museum, and Commercial Grade acrylic.

  • Sleep Panel (SP)

    These panels block all light coming through your windows and provide the acoustic dampening and thermal insulation of Standard Indow inserts. Ideal for light sleepers, night-shift workers, newborns, and home theater audiophiles.

  • Privacy Grade (PG)

    Translucent acrylic diffuses light transmission while blocking details and defined shadows. Great for bathrooms.

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Maximum Sizes

4x8 Sleep Panel, Privacy 6x8 Museum 6x8, 5x10 Standard, Acoustic, Commercial, Commercial Acoustic. Call to inquire about larger sizes and Mullion Kits. See Mullion Kit Product Sheet for details. Skylights are limited to 2x6 or 3x3.

Acrylic Weight (Approximate)

Nominal 1/8" = 0.72 lb./sq. ft. Nominal 1/4" = 1.45 lb./sq. ft.

Customer installs large Indow window insert.

Color Options

The Compression Tube is available in brown, light linen white, and black. Custom colors are available for large scale orders. Call to inquire.

Image shows insert tube color samples which come in white, brown and black.

Compatibility

In order for Indow window inserts to fit properly there must be an unobstructed flat surface perpendicular to the window pane with a depth of at least 5/8" that runs the entire perimeter of the window. We call this Frame Depth.

Common obstructions are inset window treatments (blinds), hardware, hooks, locks, and hinges. Blinds need an extra 3/5" gap between the insert and your window frame.

Solutions for less than 5/8" Frame Depth: In some cases, where there is less than 5/8", removing or replacing molding or installing a jamb extension can create room for the Indow inserts to fit. If the frame depth is just under 5/8", clear swivel clips (G) can be attached to the window frame to hold the Indow insert in place (see below). For complete solutions see our Frame Fit Kit.

Image shows swivel clip used to hold an insert when a Frame Step is less than 5/8 deep.

Product Features

  1. Acrylic Glazing

    A custom cut pane of acrylic forms the main component of an Indow insert and is available in a variety of grades to meet performance needs.

  2. Air Space

    An insulating layer of air between the existing window pane and the Indow insert. There needs to be ½" between the window pane and the insert, but 1-4" is better for acoustic performance.

  3. Compression Tube

    Silicone tubing with an ABS carrier around the acrylic glazing creates a tight seal and holds the Indow insert firmly in place. It is impervious to heat, cold, UV radiation and maintains its spring indefinitely.

Image shows cross cut of insert placed into a Frame Step to show the distance from the window to achieve best performance. The image also shows the Acrylic and tubing cross cut to share how they are made and fit together.

Additional Features

  • Image shows the back of an insert corner to reveal the corner cut which allows the insert to be easily adjusted when installed.

    Corner Cut Out

    A piece of tubing cut from each corner to prevent buckling. This faces out and is not visible from the interior. The elbow-shaped corner insert can be removed for flexible adjustments.

  • Image shows D-ring, used to remove inserts from a window frame.

    D-Ring

    A pull-ring is attached 4" above the lower left corner of the insert to aid in removal. Silver d-ring used for white tubing and black d-ring used for brown and black tubing.

  • Image shows a safety chain which is used for inserts larger than 8 square feet incase the insert is ever blown out.

    Safety Chains

    Used on windows larger than 8 sq. ft. to prevent the Indow insert from falling out of the window frame in the event of high wind pressure. The Safety Chains are inconspicuously anchored to the window frame by one small screw. Safety chains are not included on some Specialty Shaped windows.

  • Image shows Skylight safety swivel clip used on all inserts to hold them in place when installed into a skylight.

    Skylight Safety Hardware

    Required on all skylight windows, using our swivel clips or retaining pins from our Frame Fit Kit.

  • Egress

    Indow window inserts comply with egress regulations. In an emergency, occupants should be able to quickly remove the Indow inserts without a tool. In a young child's bedroom, we recommend leaving one window bare with no insert installed.

  • Storage

    Many Indow window inserts can be left in place year-round with occasional removal for cleaning. If an Indow insert is removed for an extended period, proper storage is essential. For example, do not lean the insert or store in a way that compresses the tubing or bends the acrylic. See ‘Indow Care Guide' for complete storage and product care instructions.

  • Maximum Temperature Range

    Indow inserts should not be exposed to temperatures above 160°F (71°C) for continuous duration, or 180°F (82°C) for short, intermittent periods of time.

Indow For Your Windows

  1. 1

    Request a Free Estimate. We'll provide you with a preliminary estimate based on your basic window dimensions. It's quick and easy!

  2. 2

    Measure your windows with our easy-to-use laser measurement kit. We'll guide you through the simple process, ensuring a perfect fit.

  3. 3

    Customize your inserts to match your needs and your aesthetic, with tubing colors that seamlessly blend into your space.

  4. 4

    Transform your space with custom-crafted inserts shipped directly to your home, ready to fit perfectly in your windows.

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You're one step closer to creating more comfort & quiet in your home.

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Trusted Since 2010

Indow has insulated more than 23,000 buildings - helping reduce carbon emissions by nearly 200,000 tons - and creating comfort across the US & Canada!

Excellent

4.49 Average  Rating

1527 Reviews

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  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    These windows are great! They have improved the quality of our home with reduced thermal loss and reduced noise level! The temperature today is 93° outside, our split system is set at 73° and the inside house temperature is 74°! Before the install of these windows the inside temperature with these conditions would have been 76°! Last night I noticed an ambulance going by. Normally the first thing I recognize is the noise, but last night I didn't realize it was an ambulance until I saw the flashing light! Hannah did a wonderful job coordinating the measurements and the sale! I would recommend these windows to anyone!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Excellent product, support, and very clear instructions. We look forward to installing these on all our windows.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I ordered the "acoustic grade inserts" for my bedroom to reduce road noise. They work exactly as advertised. Are they soundproofing? NO. Do they reduce noise to acceptable levels? YES. Compared to other solutions on the market (replacement windows, glass inserts etc) this is much more affordable. However, if you are looking for actual soundproofing, you need to spend more money and get something else. As a bonus, the inserts are tight fitting and have reduced drafts.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    We have single pane historic windows in our house in Newport RI. I was looking for a great solution to both temperature and noise. I decided to try the acoustic indow product.

    I am thrilled with the process and the product. James from Indow was super helpful in answering questions. The laser measuring kit was easy to use and gave you confidence in your own measuring ability as it checks your work. The 4 indow products i ordered came well packaged and were easy to put in.

    Finally, the indow inserts look great and work great. We can no longer hear every conversation outside and the birds don't wake us up every morning. My wife didn't even know they were there. They blend in and can't see them unless you look.

    I highly recommend these. More cost effective than custom storm windows, they look better and you can easily install or remove them as you need.

    Fantastic product and service.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    There work perfectly and I can't even tell they are there. My windows look the same but NO noise!!!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Excellent servie and support from start to finish!

    So satisfied with my first purchase, I got more indows!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    We installed the windows in our four seasons room We got some 85 degree days recently and the area stayed amazingly cool usually we would have the AC on it was not needed !!!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Indow has established the complete breadth of custom service, from initial enquiry to being very responsive to "after-sales" questions. Ours was and out-of-the ordinary project involving casement windows in a solarium and the end result turned out quite perfectly. Access to information online, instructions arriving with the delivered windows, and answers by phone insured we "enthusiastic amateurs" completed the job to satisfaction.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I am very pleased with my Indow window inserts. I have a very old house and am near a busy road. I wanted to reduce the noise. I've just installed them and find a considerable reduction in traffic noise. They definitely were worth the cost. The measuring process is quite detailed but easy to follow and my inserts fit perfectly in crooked, 265 year old openings. The company representative Hannah Hendrickson

    was very professional, knowledgeable, and courteous. I highly recommend the Indow

    company.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I appreciate everything about the whole Indow window process.

    Scheduling and holding a consultation online was easy and seamless. I consultant with KAYA, and he provided a thorough easy-going no pressure to move forward until I was ready consultation.

    Incentives were clearly outlined if I decided to move forward and order to be able to make my inserts even more affordable if I acted in a timely manner with measuring and submitting my order as well as returning the measure kit.

    The Indow inserts arrived within the expected timeframe and installing them was very easy. One of my favorite parts was watching how to install video, because they used humor, and it really held my attention and put me at ease, allowing me to take in all the little details I needed to insert my Indows correctly.

    Within hours, I noticed a temperature shift in the room. It was cooler and more comfortable. The next day when I worked in my office with the Indows the landscaper was across the street with the leaf blower and there was considerable reduction in noise making it a low background buzz instead of a disturbance to the work I was doing. I’ve only had them installed for three weeks and I’ve been so happy with them. It was a great investment for that room in the house that I use for my office.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    A great product. Excellent fit. Greatly reduced outside noise. Easy to install. Very happy!! Match your frame color to your current frame color and they disappear. So glad I got them.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Well it all starts with customer service. 10 out of 10. Brain McCracken did a great job. The waiting period wasn’t long considering they had to make the window inserts and measuring the window units with the laser was actually fun. Worth every penny!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    They are working great! Very happy with the purchase.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I'm enjoying the units, however will need to wait until next year's colder weather to get a truer feel or read on how well they work - thanks

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    They work very well for my 3 Bedroom windows.easy to install.