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How to Insulate Old Windows Without Replacing Them
Author: Eric Dellolio
Last Updated: Dec. 6, 2024
Read Time: 4 Minutes
Author:
Eric Dellolio
Last Updated:
Dec. 6, 2024
Read Time:
4 Minutes
Author: Eric Dellolio
Updated: Dec. 6, 2024
Read Time: 4 Minutes
Old buildings are rich in history and lore, and we love that! But we’ve been contacted more than a few times regarding sound and insulation issues in them. One major area of concern is the windows. Old windows are often drafty, lightweight, single pane windows with a poor seal, and unfortunately, many of these windows can’t be replaced because they’re protected as part of our history!
Insulating old windows is a great way to save on energy bills and keep heat in during the winter and out during the summer. So, you need effective solutions that don’t require you to replace the windows. We’ve got you covered!
how to insulate old windows
Before you do anything, use acoustical sealant caulk to fill cracks, gaps, and seams between the window frame and jamb. It’s also important to get the outside of the building if you can. It doesn’t matter what other solutions you do. This is always step one. Always.
One important note is to avoid sealing the weep holes (little squares on the exterior frame), as they allow moisture to escape and prevent rotting or mold. If you plan to open the window in the future, avoid sealing any moving parts. This foundational step ensures you’re starting from a solid base.
Now that we’ve established the fundamental first step, see where you’re at. On a cold day, put your hand on or near your window to see if there's significant heat loss through the window. Also, check for drafts to understand just how much help you’ll need. A simple test: stick a dollar bill (or a Benjamin if you’re feeling frisky) under the window and close it. If you can easily remove it, you have a drafty window. Stick that money back in your pocket with these helpful solutions.
Recommended Solution: Fantastic Frame Window Inserts
The most effective way to insulate old windows is our Fantastic Frame Window Inserts. These easy-to-install inserts meet one of the first requirements of any historically preserved window: you can’t see it! For example, we've used these to help historical hotels preserve the look on the outside, while insulating and soundproofing their windows on the inside. They’re completely transparent and barely noticeable. See if you can see it in this photo:
On to the thermal benefits! Fantastic Frame Window Inserts are highly efficient, reducing thermal transfer by up to 60% and can cut energy bills by as much as 40%. When adding one of these window inserts into every window of a historic hotel or venue, cutting energy bills almost in half can go a long way toward paying for itself and giving lasting savings.
We’ve had one customer send us a screenshot of his bill summary with 70% less electricity used. See for yourself:
These window inserts can also be made in different shapes like rounded windows and window arches as well, which is a huge value add for anyone with one of these beautiful windows. To sweeten the pot just once more, these inserts also reduce noise by up to 80%, making them an excellent option for reducing noise in buildings on busy streets.
Budget Alternatives for Some Results
If Fantastic Frame Window Inserts aren’t in your budget, there are other ways to insulate old windows without replacing them:
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- Plastic wrap or bubble wrap: A quick and inexpensive fix that can provide modest results. While it’s not the most visually appealing, it can help if you’re in a pinch.
- Thermal curtains or blankets: These can block drafts when drawn, but they also block sunlight, which could otherwise help warm the space during the day.
- Weatherstripping and draft stoppers: Affordable and effective for sealing edges and gaps. While they won’t address heat loss through the glass, they’re a good start.
- Reglazing: If permitted, reglazing your windows can reduce heat loss by up to 50%. This option requires a professional and can be costly, but it’s worth considering if historical guidelines allow.
WHY IT’S WORTH IT TO INSULATE OLD WINDOWS
Insulating old windows isn’t just about saving money—it’s about making your building more comfortable and energy-efficient. Even if your heating system is cranked up, you’ll still feel that chill near a drafty window. Similarly, in summer, proper insulation keeps things cool without overburdening your air conditioning and your wallet.
By investing in smart solutions like Fantastic Frame Window Inserts you’re not just improving energy-efficiency but enhancing your livability and comfortability. For help finding the best solution for your windows, contact us at Second Skin Audio. We’re happy to walk you through your options and help you create a more comfortable, energy-efficient space.
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