How Thermal Windows Improve Your Home’s Comfort

What Are Thermal Windows?

Thermal windows are special energy efficient windows that are designed to slow the passage of heat. Thermal windows have 2-3 panes, and many of them have non-toxic gasses between the panes. Others will have special glass that blocks UV heat from the sun. Together, the panes, gas, and special glass slow heat from passing. This is the case no matter the time of year. In summer, thermal windows block hot outside air from entering your air conditioned home. In winter, they stop heated air from escaping.

Why Does Heat Transfer Matter?

Nature is always looking for balance in temperatures. If your inside temperature is different from the outside, the warm air is going to look for a way to get through and mix with the colder air. If you would like to take a deeper dive in the science behind why and how this happens, you can check out our page on why we use acrylic vs glass.

Heat transfer matters in a more everyday life sense because it affects your wallet and your comfort. Windows are usually responsible for over a quarter of a home’s energy bills. This is especially true if you have older single-pane windows. Older windows do not block outside temperatures well, so you run your heat and AC more often to keep comfortable. In turn, you spend more.

Thermal Windows to the Rescue

This is where thermal windows come in. Thermal windows are several times more energy efficient than single-pane windows and basic double-pane windows. How is the energy efficiency of windows rated? Take a look at how windows are rated based on their ability to slow heat transfer. This is useful information as you begin to look for solutions to your energy efficiency problems. The most efficient windows are going to have the lowest U-value: the closer to 0, the better.

Are Thermal Windows Worth It?

With windows accounting for such a large portion of your energy bills, not acting on your window problem is going to cost you the most over time. But are thermal windows the most cost effective option? Thermal windows can cost up to $850 per window. And it is estimated that thermal windows can save you around 25% on energy bills. As a result, thermal window replacements will pay for themselves over time. Though that may take quite a long time.

Indow Insert in Winter

Is There a Better Solution?

Many older homes that have their original windows would benefit from upgrading their windows, but replacement projects for multiple windows adds up fast. It’s a huge financial investment. More importantly, replacing original windows can actually harm the historic value of the home. As long as the windows are in good shape and don’t need repair or replacement, there are other solutions to energy efficiency problems.

Storm window inserts can be placed inside the window frame to act as another barrier from the outside. This creates a pocket of air similar to that created by multiple panes in a thermal window. The advantage is the air gap created by installing storm window inserts can be much larger than those between panes of a single window.

Indow window inserts are made with an optical grade acrylic and edged with a silicone compression tube that allows it to fit snugly in your window frame without altering your frame in any way. When your home’s windows are outfitted with Indow inserts, you can save up to 20% on your energy bills. A performance similar to that of energy efficient thermal windows. Indow premium grade inserts are $39, so an average 12 sq. ft. window will cost around $468, nearly half the price as some thermal windows. With similar effects on your energy bills, and drastically different costs, your Indow inserts will pay for themselves much faster than thermal windows will.

To learn more about Indow window inserts’ energy efficiency, read about two tests performed by the Department of Energy and Portland State University: Indow Under the Microscope.

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

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4.50 Average Rating

1549 Reviews

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    The indow window company and their staff are great Partners in battling the cold winter drafts coming through your windows and helps keep your home warm and cozy.. Wonderful company and great customer service..

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Overall I am happy with the results. They do exactly what is advertised online.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    We ordered the Thermo insulation inserts for our cabin off the Blue Ridge Parkway in VA. The windows are old and drafty and with the wind and the cold that has happened this year, the inserts have really came through. We used to see the curtains move when the wind was blowing hard and the cold would come right through the windows. After installing the inserts, which was so easy, there is a night and day difference with the window inserts and the house is actually warmer and the heat is not running constantly. These inserts have saved us thousands of dollars in window replacments and you can not even tell that the inserts are in the windows. Thank you Window Inserts for all your help.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Excellent product for windows outside noise problems. Bought 2 Indow inserts for our bedroom windows. I was hesitant at first, but after installing our new acoustic Indows I was impressed. It really cut down on outside noise tremendously. Got few estimates for 2 new windows to replace the old ones. The cost of installing new windows was a shocker. Now, I am happy with my choice to go with Indows. Highly recommend!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    This was the easiest install, as well the team are amazing, get right on a call answer the questions, there support is fantastic. I measured all my windows live near a street looking to knock down the noise.

    I tested this bought Indows installed them Noise went down shipping, timing and quality was great.

    Now I’ll install 4 more.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Thank you indows! We are very happy with our 5 new indows which were delivered by Fedex and in

    perfect shape when opened. Our dining room and adjoining room are warmer in the cold, which is a bit more this winter

    The indows were installed easily by myself and my wife as expected and look great. In total we have installed 8 of your products. Thank you again, Randy and Mary Jane.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    The inserts came as scheduled. They were crated very well. They fit perfectly. Great product and service.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Quick delivery and the windows fit very well even with how many anomolies there were in our 107 year old house. Installation took longer than I expected with 12 units to install, but once I figured out what I was doing it went much quicker. We ordered white frames with the plan to eventually repaint all the interior trim. In the mean time, the frames hide very well with our curtains and sheers. We are glad to get the decreased noise and improved thermal performance without ruining the exterior of this historic home.

  • 3 Stars ⭐️⭐️⭐️⭐️⭐️

    My home is about 500 ft. from an interstate highway and had been looking for a solution to reduce the highway noise, especially 18-wheeler truck noise all night long. What pushed me to finally make a decision was the 9 month highway repair project with trucks moving back and forth with their loud beeping when going in reverse (every 20 seconds) all through the night, every week night. I opted for the acoustic inserts, which took 3 months to receive from the time of my order. I was not happy about the 3 month waiting period. I was very timely with measuring the windows which included an arched window which I had to trace. The measurement process required 10 hours of time, most of which was the tracing (including time and cost to make several trips to buy materials for this). When they finally arrived, I installed the inserts and had approximately a 30% reduction in decibel levels. After nearly $5,000 in costs, I was hoping to have had better noise reduction.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I live in a house that’s over 100 years old so some of the windows are odd sizes and drafty. Originally I ordered 3 Indow window inserts for my dining room to try them out. I was so impressed with their appearance and effectiveness at insulating and reducing sound that I decided to order more. Recently I ordered another 9 Indow window units for my living room, bedrooms, bathroom, and kitchen. Both of the orders went very smoothly. They arrived well packaged and in perfect condition. I have already installed all of them and just in time as Chicago and most of the midwest has just been hit by a winter storm and blizzard with below freezing temperatures and 8-12 inches of snow. I couldn’t be happier they look fantastic as well as being practical and functional. My home is so much warmer and quieter now that they have been installed. Indow’s pricing was great and they gave me discounts as a returning customer and for bulk purchasing. Customer service, instructions and follow up were all excellent. Such a wonderful company and product.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    I had 7 indow windows installed for draft reduction in my master bedroom. I had a home energy assessor [ from our utility supplier BGE] who checked for drafts / air leaks using infra-red camera and he certified "no leaks". Or bedroom is definitely less colder this winter and I am very happy with the cost effectiveness and efficiency offered by Indow window.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    An excellent product. Very well made, easy to install. Great support. Improves room temperature.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    The process of ordering and installing is quite extensive. This was my first experience with the company and left me a bit overwhelmed, even though I have 50 years experience in home construction and maintenance. But the results are really satisfying.

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    Everything fit. Installation was easy. I ordered almost 40 Indows and NO problems: clean, clearly marked for installation placement and can’t wait to NOT freeze this winter! Martin and Matt were beyond helpful!

  • 5 Stars ⭐️⭐️⭐️⭐️⭐️

    The indows came and all fit perfictly. I am excited that I will no longer have to install the winterizing plastic sheets over our windows each winter. They are nearly invisible but I have the feeling that they will make a positive impact on our heating bills. Thank you!