Block Heat, Save Energy, and Stay Cool

Heat infiltrates through your windows and your AC has to work on overdrive, leading to high energy bills and a house that is still too stuffy and warm.

Do You Have Trouble Keeping Your House Cool?

Is your energy bill astronomically high in the summer? Running the A/C but not feeling comfortable results? Searching for how to insulate windows to keep heat out?

When the weather is hot, heat infiltrates through your windows and your AC has to work on overdrive, leading to high energy bills and a house that is still too stuffy and warm.

How To Insulate From Heat & Stay Cool All Summer

Indow inserts create an airtight seal around your windows that insulates your home and keeps the cool conditioned air inside.

The problem could be that your windows are underperforming – leaking the cool air out and letting the hot air in.

It’s time to give your A/C a rest by upgrading your windows.

Insulate and seal your windows with Indow window inserts – the most affordable way to keep your house comfortable and quiet (and save money) all year long.

Upgrade Your Windows to Maximize Summer Comfort

Sealing your windows is an important part of protecting your home against hot weather. Indow inserts create an airtight seal around your windows that insulates your home and keeps the cool, conditioned air inside. Our inserts stop heat from coming through windows while still allowing natural light in.

Additionally, Indow’s inserts help homeowners save 20% on their yearly energy bill , reduces outside noise by up to 70%, blocks pollutants like smoke or pollen from infiltrating through your windows, and helps regulate your home’s temperature all year long.

Cheryl Scott

These window inserts have solved so many of the problems with old houses and gorgeous old windows. It seals in the cool air (critical in Florida) and seals out the dust and noise from the park across the street. WOW!

Let Us Help You

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


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


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See The Results – Not The Insert

You’ll notice the impact your Indow inserts make right away, but you might forget they’re there soon after. We’ve engineered our inserts to be inconspicuous and blend in with your existing windows. Each insert is customizable with your choice of tubing color to match your frame.

A Smart Investment

Indow inserts can cost as much as 60% less per square foot compared to a full window replacement, while providing substantial savings on energy bills and unparalleled performance compared to bargain solutions.

Lifetime Warranty & Snug Fit Guarantee

Our on-staff Comfort Experts work with you to make sure inserts will solve your window issues, fit snugly, and be a valuable improvement to your home. That’s why all of our inserts are backed by a Lifetime Warranty, Snug Fit Guarantee, and why we love reading the thousands of rave reviews we receive!

Customer Reviews


4.49 Average 1493 Reviews logo


Brian was very helpful & informative. He helped me order the correct windows for my needs. They were shipped with the utmost of care & arrived ahead of schedule. Ultimately, the Indow Windows have been very helpful in muffling unwanted noises & they have helped save on our energy costs. Thank you, Indow Window!

Posted 1 week ago

Cynthia M

Very happy with the reduction in noise. Easy to install and use. Great customer service.

Posted 1 month ago

Juli E

We are thrilled with our Indow window inserts! I'd been on the lookout for a more permanent solution to leaky windows in our third floor living space. I discovered Indow on social media but since then have learned of friends who'd had Indow recommended to them by their rennovation contractor. The entire process went smoothly with friendly reps at hand to talk through questions during measuring, etc. They fit perfectly and help us to maintain the beautiful design of the windows on our 100 year old home! Highly recommend!!

Posted 2 months ago

Jen F

Worth the money!

Posted 2 months ago

Elizabeth H

For townhouse living, this solved my problem with noise from my neighbor's with my kitchen window. A considerable decrease of noise indeed! Measurements were a bit frustrating so I recommend using a laser measurement device and following directions to use a string for the diagonal. They look great and were easy to push into place. I highly recommend as an alternative to buying a new window.

Posted 3 months ago


Easy to install, and instantly stopped drafts and dampened outside noises very effectively!

Posted 3 months ago

Robert C

The process could've been smoother with the sending of the measuring kit. There was a delay with weather in Oregon but then it felt like my kit was still delayed due to other reasons. Most new homes (like mine) have textured paint and it can also be inside your window frames. I measured everything out but I still have little tiny gaps due to the texturing. Not indows problem but just be aware you made need to sand or fill in those gaps yourself to get a perfect seal. I did the acoustic grade inserts and they have reduced some noise but they will not completely block or significantly reduce road noise. This is most apparent with deep or lower frequencies like truck exhausts or modified street racing cars that are quite popular these days. Taking the inserts out to open your windows isn't an easy task. The little metal hook they provide needs to be either bigger or you can attach something to it as a way to leverage yourself. Overall the process was average. I think they're definitely a good option for weatherproofing and some sound reduction depending on the type of windows you have. I would purchase again.

Posted 3 months ago

Shelley C

The process for ordering and installing the Indow Widnow inserts was so easy. They sent the measuring information and it had great instructions. The inserts were delivered by UPS was crushed on one corner, but the company had packed them well, so there was no damage. We installed them the same day. It works best if you have two people completing the installation. We felt the results immediately and are glad we spent the money to make our home just a little more efficient.

Posted 3 months ago

Barry B

The insert fits like a glove and insulates the window! No more frost and condensation on the interior of the window! Thank you for an easy, effective and attractive fix!

Posted 3 months ago

Susan A

The support during the entire process was wonderful, thank you so much for the extra quiet space!

Posted 3 months ago

Volodymyr R

Very good good quality. Overall very satisfied with this product and service. Thanks

Posted 3 months ago

Jane H

Our home was built in 1913 and has beautiful old wavy glass single-paned windows. I’m so glad we were told about Indows and didn’t have to replace the original windows. We live in Canada but had no difficulty placing the order and were very impressed by how accurately the company met its deadlines, including cross border delivery. The Indows inserts blend in perfectly with our home and the existing window frames. You don’t see them unless you’re actually looking for them. But what we did notice was how much warmer the rooms feel the minute the inserts were installed! I can’t speak to any heating bill savings because they just went in this week, but our home feels much, much cozier. Our contractor who took all the measurements and installed the Indows says: “Excellent instructional videos: clear and informative. Very impressed with the design and the product. Overall, the ease of installation is quite impressive. Working with all the staff at the company was great – everyone was very helpful.” I’m already recommending this company to any of my friends who live in drafty older homes and want to reduce their heating/cooling bills and do some good for the environment.

Posted 3 months ago


Don't be afraid of buying an older home with single pane windows. This company has you covered. Their inserts are super high quality and fit well thanks to the laser measuring kit they send. Highly recommended!

Posted 3 months ago

Katie M

We purchased three Indows to reduce drafts and noise in our bedroom, which faces the street. The improvement was immediate. Our house was built in 1958 and although we have exterior storm windows we didn't want to replace the windows outright due to cost and architectural consistency. These were an excellent solution.

Posted 3 months ago

Matthew L

Indow inserts were easy to measure, order and install. They've provided great insulation for old single-pane and stained glass windows in an antique home. We can significantly feel how much better the home holds heat.

Posted 4 months ago