Product Users

Who Uses EnergySavr Window Inserts?

EnergySavr Window Inserts are made for people who have drafty windows they want to keep rather than replace. They are used in homes, rentals, businesses, churches, historic buildings, offices, screened porches and other spaces where comfort and affordability matter.

EnergySavr Window Inserts are thermal window inserts—also called insulating interior storm window inserts—used to reduce drafts, add an insulating airspace and improve comfort in existing windows.

Homeowners with Drafty Windows

Homeowners use window inserts to improve older single-pane windows, leaky dual-pane windows and other existing windows that still have useful frames and glass. The foam gasket helps seal air leaks around the interior opening, while the space between the insert and existing glass adds another insulating airspace.

The panels install from inside, so there is no need to remove the original windows or change the outside appearance of the home. Most standard indoor installations require no screws, tape or permanent hardware.

This makes the inserts practical for bedrooms, living rooms, kitchens, home offices and other spaces where drafts make the room harder to heat or cool comfortably.

Older Homes and Historic Properties

Owners of older and historic buildings often want to improve comfort without discarding original woodwork, glass or architectural character. EnergySavr inserts fit inside the existing opening and can be removed later, leaving the original window in place.

Our inserts have been used in older homes and historic properties, including Reno's Lake Mansion, a National Register of Historic Places property. A historic-preservation memo discussing interior window inserts is available below.

Read the Historical Preservation Memo

Renters, Landlords and Rental Properties

Businesses, Offices and Institutional Buildings

Businesses, offices, schools, government buildings and other organizations use interior window inserts for the same basic reasons homeowners do: to reduce drafts, improve comfort near windows and avoid replacing windows.

Custom-fit panels can be ordered for a single problem room or grouped across similar windows. Online pricing and automatic volume discounts make it easier to compare the cost before committing to a larger project.

EnergySavr inserts installed in a University of Nevada, Reno building.

Interior inserts help improve existing windows without an exterior alteration.

Churches, Nonprofits and Community Buildings

Churches, meeting houses and community organizations often occupy buildings with older windows, stained glass or architectural features they want to preserve. Interior inserts can help reduce drafts around those existing windows while leaving the original glazing and exterior appearance in place. They also work great in offfice area or commons windows to stop drafts, increase comfort and save on energy costs.

Screened Porches and Sunrooms

Custom panels can also help reduce wind, drafts, dust, dirt and pollen entering through screened porches and sunrooms. Because these openings are exposed to wind pressure, porch panels normally need clips, turn buttons, finishing nails, removable strips or another suitable retention method.

Read about Screen Porch Window Insert Panels

Cold Winters, Hot Summers and Year-Round Comfort

In winter, the perimeter seal helps stop cold drafts and the trapped airspace adds insulation. During warmer weather, the additional layer can help reduce heat transfer through the window. Results vary with climate, window condition and how the building is used.

Customers can remove the inserts when they want open-window ventilation and reinstall them when heating, cooling or outside-air conditions make the extra seal useful again. It's easy to pop push them in or pull them out.

When Another Solution May Be Better

• Structurally failing windows: Repair or replacement may be appropriate when frames, sashes or glass are badly damaged
• Maximum noise reduction: Heavy rigid acrylic inserts are generally the better category when noise is the main goal
• Temporary lowest-cost sealing: Heat-shrink plastic kits cost less initially but are not normally reusable
• Wind-exposed openings: Screened porches and similar spaces require suitable retention hardware

See our Best Window Insert Alternatives page for a fuller comparison.

Measure, Price and Order Online

Watch the measuring instructions, measure all of the windows you plan to improve and enter each size on the ordering page. You will see panel prices and automatic volume discounts immediately before submitting the order for custom production.