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Indow® Window Inserts for Insulation in VT
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How they work
Indow window inserts are made of acrylic and edged with a patented Compression Tube. When pressed into place, the silicone tubing compresses, holding the Indow® insert securely in place while sealing out cold drafts or hot summer air.
How they perform
Indow window inserts give you energy-saving insulation equivalent to double-pane windows, and they’re even better at insulating sound. Plus, you don’t have to worry about any lead contamination that can occur when your old windows are ripped out of the walls.
How they fit
Each Indow® window insert is laser-measured and custom-made to fit your window precisely, making them easier to use than storm windows. Read more about product options and our laser tailoring system.
Proven Benefits You’ll Feel Every Day
Experience the comfort that goes beyond the numbers. Backed by science, designed for real homes.
Thermal Performance
R-Value**
Indow® window inserts have 94% of the insulation of standard double-pane windows. The surface of an acrylic Indow® insert is much warmer than the surface of a pane of glass, so you’ll feel warmer even if the air temperature in both cases is the same.
** R-Value measures the thermal resistance of a material and its effectiveness at keeping the outside out and the inside in.
Airtight Seal
Our inserts are built with compression tubing that forms a snug, airtight seal against your existing window frames—no tools, no damage, no gaps.
- Keep winter chills out and summer heat at bay
- Prevent hot or cold spots near windows
- Maintain a consistent, cozy indoor temperature
New England’s four-season climate is no challenge: Indow® window inserts adapt with your home, year after year.
Sound Reduction
Say goodbye to city noise, early trash pickups, or barking neighbors. Our acoustic-grade window insulation inserts dramatically reduce outside noise, turning your home into a calmer, more peaceful space.
- Up to 70% reduction in sound penetration
- Standard inserts lower noise by 10 dBA (≈50% reduction)
- Acoustic-grade inserts reduce up to 18.9 dBA (≈70%+)
Whether you work from home, are a light sleeper, or simply crave a quieter living room, our inserts deliver real acoustic relief, without changing your windows.
Energy Efficiency
Keeping the heat in and the AC out isn’t just about comfort, it’s about real savings.
- A study by the U.S. Department of Energy showed a 20%+ reduction in HVAC energy use after installing inserts
- Another study by Portland State University found an average 19% drop in heating costs across multiple homes
- Our acrylic inserts deliver 94% of the insulation value of double-pane windows, without the cost or construction mess
That means lower utility bills, less strain on your heating and cooling systems, and a smaller carbon footprint, without ever replacing your original windows.
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Adaptable
Our window insulation inserts can be customized to just about any shape: rounds, arches, octagons, batwings, odd angles, rounded corners, or frames with multiple angles.
Perfect fit
Customizable
Seven specialty grades and three tubing colors are available. All grades provide the same draft blocking and noise-reducing window benefits.
Ready to lower your energy bills and boost your comfort?
Made for Vermont Weather, Designed for Vermont Homes
Our custom-measured inserts let you insulate your home without replacing the original window frames. Whether your house is old or new, these inserts are made to fit your exact window dimensions.
Perfect For:
Antique window frames
Irregular or non-standard window sizes
Properties under historical preservation guidelines
Homeowners and renters seeking a non-invasive, reversible solution
Designed and installed right here in New England, our inserts are made to withstand everything Vermont weather throws your way, from icy drafts to muggy July afternoons.
Our Process
Upgrading your windows doesn’t have to be complicated. At Farnum Insulators, we’ve simplified the process so you get all the comfort and efficiency without any of the stress.
Indow Window Inserts Installed by Experts
From the first visit to the final fit, our team handles everything with precision and care. No guessing, no messy construction, and no disruptions to your daily routine, just beautifully insulated windows from people who know New England homes inside and out.
Here’s What to Expect
- Free Quote: You can call us now or fill out the form for us to contact you. Request your free quote today!
- Custom measurement for the fabrication of the inserts: Your inserts are custom-built to match the exact shape and size of each window. They come with compression tubing for the perfect fit.
- Professional Installation: Our trained technicians handle installation with care and precision. Our friendly team will accommodate your needs and do all the work so that you can just relax and enjoy the results.
- Ongoing Support: Whether you need seasonal removal tips or a quick adjustment, we’re here to help.
DIY vs. Professional Installation
| Feature | DIY Inserts | Farnum Professional Installation |
| Custom Measurements | ❌ Often manual | Precision-laser measured |
| Window Frame Integrity | ❌ Risk of poor fit | Guaranteed no-damage install |
| Seal Effectiveness | ⚠️ May leave air gaps | Airtight compression fit |
| Installation Time | ❌ Can take hours | Done in under 30–60 minutes |
| Long-Term Durability | ⚠️ Varies by skill | Maintained over time |
| Peace of Mind | ❌ Self-managed | Farnum handles it all |
What Customers Are Saying
“From the first visit to the finished projects (Indow windows and spray foam insulation) we received timely, professional, and friendly service from everyone involved (the owners and workers).
They left everything spotless! We wouldn’t hesitate to recommend them and we’d definitely use them again.”
– Dane H.
“John was super informative and direct with what he suggested for our needs.
He communicated a realistic timeline of getting the work done and kept us posted as the work progressed.”
– Peter J.
“We just had Indows installed by Farnum around the front door in our 210-year-old house.
Amazed that they are completely inconspicuous and allow the charm of our antique glass to shine through the added layer of insulation, even around a curved window above the door!!
Now I just have to stop bumping my head against them… they are that clear!!!”
– Dennis P.
Contact us for a free Indow® window quote
For Indow® inserts use this form to send us an email or call us!
802 523 328
For insulation, weatherization and general inquiries:
802 454-5162
info@farnuminsulators.com
FAQs
Are window inserts worth it?
Yes! They’re one of the easiest, most cost-effective ways to improve comfort and efficiency. Our custom-measured Indow® window inserts provide insulation, sound dampening, and draft reduction without the need to replace your existing windows.
Can you install window inserts yourself?
We don’t recommend it. For the best performance and a perfect fit, our inserts require professional laser measurements and expert installation. That’s why we handle the process from start to finish.
Do window inserts reduce heat?
Absolutely. Window inserts add a layer of insulation that reduces heat loss in winter and helps block heat in the summer, making your home more energy-efficient and comfortable year-round.
Can you open windows with window inserts?
Yes, but you’ll need to remove the insert first. They’re easy to take in and out, so you can still enjoy fresh air when you want it, without compromising insulation the rest of the time.
Is there a way to insulate windows without replacing them?
Yes! Our interior window inserts are designed specifically for this purpose. They improve insulation and comfort while preserving your existing window frames, with no need for messy or expensive replacements.
How much do custom window inserts cost?
Pricing depends on the size and number of windows, as well as the type of insert needed. We offer free consultations to provide accurate, custom quotes tailored to your space.
How can I keep my house warm without double-pane windows?
Window inserts are a smart alternative to double-pane windows. They offer many of the same insulation benefits, like reducing drafts and heat loss, without the high cost or disruption of window replacement.