Product Details

What Are EnergySavr Window Inserts?

EnergySavr Window Inserts are affordable, custom-fit interior window inserts designed to stop drafts, reduce air infiltration and improve the comfort of existing windows without replacing them.

Each insert combines a lightweight aluminum frame, strong clear vinyl film and a compressible foam gasket. When the panel is pressed into the inside of the window opening, the gasket seals around the perimeter and creates an additional insulating airspace between the insert and the existing glass.

The inserts are clear, lightweight, removable and reusable. Most standard panels weigh less than two pounds, making them easy to install, remove and store. They can be used with single-pane and dual-pane windows made from wood, metal or vinyl and also inside most screen porches.

Product at a Glance

A Practical Upgrade for the Windows You Already Have

Many drafty windows do not need to be replaced. The glass and frame may still be in good condition while gaps around the sash or window opening allow cold air, hot air, dust and outside particles to enter.

Window Inserts help improve those windows by sealing the interior opening and adding another insulating airspace. This can make rooms feel more comfortable in winter and easier to control during hot weather, without the cost and disruption of a full replacement-window project.

How Thermal Window Inserts Work

Thermal window inserts are removable interior panels that improve the thermal performance of existing windows by reducing air leakage and adding an insulating airspace. EnergySavr panels use clear vinyl film, a lightweight aluminum frame and a compressible foam gasket.

Window heat loss occurs in two main ways: air leaks around the window and heat transfer through the window materials. Window inserts help address both and also help keep out dust, pollen and smoke.

• The foam gasket seals the perimeter. This helps stop drafts caused by air leaking around the existing window.
• The space between the insert and glass traps still air. This additional airspace acts as another insulating layer.
• The insert remains inside the room. It can be installed and removed without changing the exterior appearance of the building.

The greatest improvement is often felt on older single-pane windows and leaky dual-pane windows, but results depend on the condition of the existing window, the accuracy of the measurements, the fit of the insert and the climate.

Quick installation and removal (Click for a larger image)

Installed window insert (Click for a larger image)

Materials and Construction

• Frame: Lightweight aluminum available in white, brown and tan
• Clear panel: Strong clear vinyl film stretched tightly over the frame
• Perimeter seal: Compressible foam weatherstrip around the entire insert
• Overall thickness: Approximately 1/2 inch
• Typical weight: Less than two pounds for most standard-size panels
• Larger openings: Built as left/right, upper/lower or three panels connect together. Split panels work the same to stop drafts and save energy

Clear, Lightweight and Easy to Handle

The strong clear vinyl film is one of the reasons EnergySavr inserts can remain lightweight and affordable. Unlike glass, the film does not shatter into sharp pieces, and the finished panel is much easier to carry, install, remove and store.

The film is stretched tightly to preserve the view through the existing window. Because it is flexible rather than rigid, slight waves or reflections may sometimes be visible. This is normal and does not affect the perimeter seal or insulating airspace.

Customers comparing vinyl film, rigid acrylic and other window-insulation choices can read our Window Insert Alternatives page.

How Do You Install and Remove Them?

For most standard indoor windows, no tools, screws or permanent fasteners are needed. Push the insert into the interior window opening and press around the edges until the foam gasket forms a tight seal.

When you want to open the window, pull the insert out from inside the room. Reinstall it by pressing it back into the same opening.

Screened porches, sunrooms and other openings exposed to wind may require clips or another suitable method of retention. See our Screen Porch Window Panels page for those installation details.

Split-panel installation: step 1 (Click for a larger image)	Split-panel installation: step 2 (Click for a larger image)
Split-panel installation: step 3 (Click for a larger image)	Split-panel installation: step 4 (Click for a larger image)

Split Panels for Larger Windows

Larger openings can be single panels in many cases as long as they are grouped with similar sizes. Some large openings must be split into left/right, upper/lower or three or more panels that connect together with a connector track and work the same to stop drafts and save energy.

Split panels make large inserts easier to ship, carry, install, remove and store. It's two or three panels connected together at the same location on the opening as a large single panel.

What Can EnergySavr Window Inserts Help With?

• Drafts: Help seal air leaks around the interior window opening
• Room comfort: Help reduce cold areas near windows in winter and heat entering during warmer weather
• Energy loss: Add an insulating airspace that can help reduce heating and cooling loss
• Dust, dirt, pollen and smoke: Help reduce dust, pollen and smoke entering through leaky windows
• Existing windows: Improve windows without removing original glass, woodwork or historic features
• Convenience: Remove and reinstall the panels as seasons and access needs change. They work the same for heating in the winter or cooling in the summer.
• Appearance: Preserve the exterior appearance of the home or building

Performance varies with window condition, insert fit, climate and how the building is used. The most noticeable improvement is usually reduced air movement and better comfort near drafty windows.

Affordable by Design

EnergySavr uses a factory-direct online ordering model to make custom window inserts easier and more affordable to buy. Customers can watch the videos, read the instructions, measure their own windows and see pricing online without waiting for an in-home sales appointment or individually prepared estimate.

• Clear measuring and installation videos
• Instant online pricing
• Automatic volume discounts as the order grows
• Custom manufacturing at our Reno, Nevada shop
• Direct shipping to customers nationwide
• Fast 1- to 2-week build-and-ship turnaround

Many customers measure all of the windows they plan to improve and order them together. Larger orders can receive better panel pricing through automatic volume discounts and spread the base shipping cost across the full order.

How to Measure and Order

1. Watch the measuring video and review the written measuring instructions.
2. Measure the inside opening of each window as directed.
3. Enter each width and height on the ordering page.
4. See panel prices and automatic volume discounts immediately.
5. Review the complete order before submitting it for custom production.

Every panel is custom-built to the measurements submitted with the order. For the best overall value, measure all of the windows you plan to address before deciding how many panels to purchase.