Block Cold Drafts & Retain Heat With Insulating Window Inserts

Leaky Windows Lead To Winter Chill

Windows (even double paned) are notoriously bad insulators - leading to tremendous heat loss in the cold, winter months. Indow offers the perfect solution: innovative window inserts designed to stop drafts, improve energy efficiency, and enhance your home's comfort all year round.

The Deep Discomfort Of Drafty Windows

The human body loses most of its heat from the head, hands, and feet. That's why we wear hats, gloves, and heavy socks when we're trying to stay warm in the winter. Similarly, drafty windows are the #1 source of temperature loss in the home and the leading cause of wasted energy.

"

Energy-efficient window attachments are important for both new and existing homes. About 30% of a home's heating energy is lost through windows.

"

— US Department of Energy
energy.gov

Even a well sealed single pane window can let in a basketball worth of cold air every hour (double pane windows aren't much better!), which is why it can be so difficult to keep your home a comfortable temperature without running the heat all day.

Cozy Winter Comfort with Indow Thermal Inserts

The US Department of Energy recommends insulating your windows with window coverings to reduce energy costs. The biggest value for the amount of energy reduction? Interior storm windows - aka window inserts!

With our patented Snug Fit compression tubing and premium acrylic glazing, our Thermal Window Inserts reduces the amount of cold drafts and heat loss happening through your windows. This reduces the load on your HVAC and leads to lower energy use - saving homeowners an average of 20% per year on energy expenses!

But the best part? They blend in with your existing window frames and let light flow in freely. In fact, if it wasn't for how much warmer they make your home - you'd forget they were there!

SEE IT IN ACTION

Our acrylic window inserts create a barrier of trapped air to keep cold out and heat in. See why acrylic aces our insulation test!

Customer Stories

A couple in a historic home used Indow inserts as a cost-effective, non-invasive alternative to window replacement, preserving aesthetics while improving comfort and energy savings.

"

Using Indow inserts, the space heats up fast and it stays warm for hours, even after I switch off the space heater. It's actually more comfortable to sit on the sofa next to an Indow insert than it is to sit next to the brand new double panes.

"

— Craig & Shari S

More Quiet, More Comfort, More Savings

In addition to a substantial reduction in temperature transfer, Indow Thermal Inserts also provide significant noise reduction, keeping your home up to 50% quieter. It's a win-win-win for your pocket book, the planet, and your day-to-day comfort.

Our air-tight seal not only keeps noise out and your ideal temperature in, but it also reduces condensation and blocks dust, pollen, and other airborne particles. But that doesn't mean you'll have to live in a hermetically sealed home! With a gentle tug on the provided D-ring, you can break the seal and remove the inserts whenever you want to open your windows and let in some fresh air.

RECOMMENDED FOR YOU

Thermal Inserts

Starting at $28/sf

Block cold drafts in the winter, keep the cool air inside during the summer, and save an average of 20% on your heating & cooling bills. These climate control inserts also reduce noise up to 50% and prevent condensation.

Performance Highlights

  • ENERGY
    SAVINGS

    AVERAGE
    20%

  • NOISE
    REDUCTION

    UP TO
    50%

  • PERFECT
    FIT RATE

    OVER
    99%

Indow vs Replacement Windows

Adding Indow inserts to an existing window can make your windows perform as well (or better!) than a replacement window, but at a fraction of the cost and without the hassle and disruption of installing new windows.

AVERAGE COST

  • INDOW INSERT: $372
  • SINGLE-PANE: $450
  • DOUBLE-PANE: $539
  • TRIPLE-PANE: $766
  • 0%
  • 5%
  • 10%
  • 15%
  • 20%
  • 25%
  • 30%

ENERGY SAVINGS

The Indow Window Difference

  • Guaranteed To Fit

    Your inserts are custom made to your exact window measurements with our proprietary compression tubing, ensuring a nearly airtight seal and backed by our Snug Fit Guarantee.

  • Quality Built For A Lifetime

    Your inserts feature premium insulating acrylic that is built to withstand daily use and engineered to perform for the lifetime of your home. Guaranteed to be free from defect by our Lifetime Warranty.

  • Easy To Install & Remove

    Installation is simple - no tools or modifications to your existing window frames are necessary. Simply slide them into place in seconds and experience immediate results.

  • Handcrafted In The USA

    Each insert is proudly handcrafted in our Portland, OR facility using materials sourced right here in the USA, which allows us to maintain rigorous quality control and meet our exacting standards.

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

  • 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.

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.

Zip / Postal Code

WE SHIP TO YOU!

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

Congratulations!

To receive a customized estimate for your space or learn more about how Indow inserts can improve the comfort, quiet, & efficiency of your home, fill out the fields below.

First Name
Last Name
Email
Phone
Zip / Postal Code
Country

What issues are you experiencing?

(Optional) For a faster response, include the number of windows you'd like to insulate and approximate window dimensions (rounded up to the next inch) for each window:

We value safety and privacy. We will never share, sell, or rent your data to third parties not directly related to your purchase or consideration of our products. Read our full policy here.