Our Insulating Inserts

Each insulating window insert is made of a custom-made pine frame wrapped in two layers of tightly-sealed, clear polyolefin film and finished with a compressible foam gasket. The foam allows enough give for the inserts to be easily slid into place in the fall and removed in the spring, while holding firmly enough to provide a tight, friction-based seal that stops drafts and adds two more insulating air spaces between your home and your window. The inserts are installed inside of your existing window with no fasteners required.

We keep our insert-prices exceptionally low (50%-75% cheaper than commercial products) through our non-profit model of cooperative insert-building. This means that customers contribute time at our local Community Builds. Please visit our Volunteer page to learn more about our participatory model.

Ordering Process

  1. INQUIRE by calling 207-596-3073 or  PLACE AN ORDER and you will be assigned to your closest Community Build. We will then contact you to begin the measuring process.
  2. GET MEASURED by our volunteers who will visit, assess and measure your windows, and give you a quote
  3. SIGN UP for shifts at a Community Build held September – January across Maine and Vermont.
  4. PAY for your inserts (special low-income pricing available upon request) HERE
  5. PARTICIPATE in the Community Build where the inserts are built
  6. INSTALL your inserts in your windows
  7. ENJOY a warmer home and lower heating bills!

Sample Price Chart for 2021

Our inserts are custom built to the exact measurements of your windows and are custom priced.

Below are sample prices. Your exact price will vary. 

  • Our Pine Frames are sturdy and beautiful: available in natural pine or white-painted.
  • Pine Frames provide additional insulation, unlike aluminum frames which conduct heat.
  • Two layers of polyolefin film creates two dead air spaces: one between the two layers of film and one between the insert and your window. This is twice the insulative value of a single-layer insert.
  • Each insert is custom-built to the exact measurements of each window, ensuring a tight fit and excellent insulation.
  • Inserts are removable and reusable each year. See our storage tips. >link<
  • Inserts last 5-10 years. If the plastic or foam wears out after that time (or if damaged by kids or pets), the inserts can be rewrapped for just $15. >link<
  • Our local Community Build model ensures that our inserts are as affordable as possible because we harness the power of YOU.
  • Low income households can qualify for up to 10 natural pine inserts per year at no charge.
  • Savings will vary depending on many factors, including the quality of your existing windows. Our research shows that, in a typical house, 10 inserts save an average of 105 gallons of heating fuel every year for an estimated savings of $270 per year. Our inserts generally pay for themselves in less than two heating seasons.

See the Difference

These two photos were taken by a volunteer in Wells on a 29° day in November. The photos show two different windows at the Wells Reserve at Laudholm Visitor Center— one with insulating window inserts, and one without. The windows are ten feet apart, but in different rooms. The thermometers were left for 15 minutes in each room, out of the sun, on the window sill. Insulating Window Inserts make all the difference!