Interior Storm Windows

The Innerglass Compression Window is a vinyl framed, Glass Interior Storm Window that mounts on the inside of your primary window using Compression-Fit technology. These storm windows seal tightly, eliminating all drafts, condensation, and outside noise.

The Compression-Fit Advantage eliminates the need to install a track for the window to sit in, thus providing an airtight fit, even for windows that are not square!

Innerglass windows are quick and easy to install … minimal skills and 10 minutes is all you'll need. Most people do it themselves. No carpentry is involved. These windows do not disturb the integrity of your existing windows.

They are perfect for Historic Renovations, Commercial Buildings, Homes, and Condominiums.


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When you need a storm window that slides up & down, the Double Hung Interior Storm Window by Innerglass is your choice. It only needs 1 1/8″depth in the opening for the tracks to be installed at the left, right, and top. There is no track needed at the bottom. The seal is made with a Q-Lon weather-strip on the lower sash. The tracks are in 2 parts. A “C" channel is applied with a single face foam tape into 3 sides of the opening. The double tracks are inserted into the C channel. This arrangement allows the inner track to be shimmed to allow for “out of square" openings. The sashes are spring-loaded on the left side and are easily inserted into the left track and then into the right track. This feature makes the sashes easily removable for cleaning. Innerglass will match the meeting rail height of the existing window so that the look will be unchanged.


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When the existing window is a horizontal slider, or several steel casement windows together in one opening, our Sliding Storm Window is the answer. The sliding window can be done as a double slider, left or right opening, or a triple slider where both left & right open and the center is stationary. The tracks consist of a C channel taped and screwed into the opening at left, right, and top, and the bottom track is just taped in the opening. It also features Teflon slick tape in the opening sash track. Double tracks are inserted into the C track at left, right, and top. This allows the inner track to be shimmed to accommodate out of square conditions. The vinyl tracks don't need weather-stripping because the material itself acts as the weather-stripping. We use a physical interlock between the sashes for extra tightness.


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The Surface mount interior storm window is designed for use where there is no depth available in the opening to mount a compression window.

The Surface Mount Storm overlaps the glass area, as in a French door for example.

There is a weather-strip on the back of the frame to seal against the wood and it is attached by turn buttons.


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Innerglass Storm windows come in various options to fit your project's needs.  Ask us about Low E glazing to boost energy-saving performance further and protect your home or office from harmful UV rays.

Tempered Glass, Plexiglas, and Laminated Glass are available options as well.

Fill out the form on our Contact page or give us a call to discuss your project and find out how our interior storm windows can help with your project.


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Mullion posts are used to split up large window openings, both vertically and horizontally.

• Energy Star Certified

• Quick & easy to install and remove in seconds.

• Maintain the charm & beauty of your existing windows

• Significantly reduce heating & cooling bills

• Compression-Fit to eliminate drafts completely

• Greatly reduce outside noise

• Perfect for enclosing screen porches

• Virtually invisible once installed

• Maintain the charm & beauty of your existing windows

• 5ignificantly reduce heating & cooling bills

• 5 Year Warranty

Innerglass interior storm windows are significantly more effective at insulating your home and lowering your heating and cooling bills than traditional exterior storm windows.

Innerglass windows are 5 times tighter than exterior storms, because outside storm windows must be ventilated (you know, the weep holes) to get rid of the condensation that has already happened.

In contrast, our interior storm window is so tight it provides a vapor barrier on the warm side that stops condensation in the first place.

Innerglass Window Systems pioneered the use of high performance Low-E glass in our interior storm windows. Low-E glass doubles the R value of regular glass making you warmer in the winter and cooler in the summer. It also cuts out 2/3 of the ultraviolet rays that damage your rugs and furniture.

Our Custom Made Storm Windows are the most affordable, convenient, and energy efficient way to upgrade your existing windows. The Innerglass Interior Storm Window will give you the performance of high end replacement windows at less than half the cost!

The color blue and shades of blue represent Cold (dark blue) or Cool (lighter blue).

Red represents Hot and orange represents Warm.

The Innerglass Interior Storm Window is positioned on the left side. The right side of the image shows where energy dollars are exiting the structure without the Innerglass Interior Storm.

More Test Results

The Innerglass Storm Window mounts on the inside of the stops of the primary window, where it seals tightly, eliminating drafts, condensation & noise problems. It conforms to the window opening and pops in and out easily without tools.

Step 1:
Cut the header channel to fit inside the top of your window frame and secure the channel in place.

Step 2:
Squeeze the compression sides in to insert the top of the window into the header channel, then continue pressing the sides in from top to bottom as you push it in place.

Step 3:
Drill a 3/32″hole on each side in front of the window about 1/3 of the way up from the sill and insert the blocking pins.

Innerglass Window interior storm windows can work in several different types of settings and have several different options to fit your situation.

These galleries show all the locations where Innerglass Windows can help improve window performance and the different kinds of window options we offer.

The first gallery shows the places our energy efficient windows have been used. The second gallery shows the different kind of interior storm window products we manufacture.

In both cases, you can click on one of the buttons to filter the results to switch between each of the options.

While attending the 2016 National Trust for Historic Preservation conference in Washington DC at the Hilton where the Beatles last stayed. This is where I met 2 young ladies from the DC historical society.

They told me the story of a beautiful 1928 Building on Dupont Circle, shaped like an arrowhead at 1350 CT Ave NW Wash DC, with the back of the building facing 19th St.The 12-story building was originally built as a hotel, is now office space. The street level is stores and restaurants. The 2nd through 12th floors has nearly 1000 beautiful original double hung wood single pane windows.

We met with the building owners who desperately needed to get the Heating and Air Conditioning costs under control, while also dealing with the DC Historic Society, who insisted that they could not just toss out the historic windows and put in replacement windows. They had been at odds for months, until the DC Historical Society brought us in. Our solution was to give each side what they wanted and needed. We proposed to leave the historic wood windows in place (To make DC Historical happy), and install 968 Interior Low E Glass Compression Storm windows. (To make the Owners happy with Year-round Energy savings and comfort.) With our windows on average saving 20% on annual energy costs it is less than a 5-year payback. By the 6th year and onward the savings are pure profit.

As an added benefit, the storms also are good at soundproofing. This was pointed out to us by one of the tenants, whose windows at the 2nd floor was right above some Street Musicians who would gather all day on the sidewalk and play for tips.She was at wits end, because she was more musically talented than they were, and was wanting them to get mandatory music lessons. This flashpoint was avoided because she could no longer hear the street musicians.

For the last 25 years my wife and I have been restoring an historic home in Sherman. Our projects have run the entire spectrum of renovation from basement to attic over this time and we have performed the majority of this work with our own hands. We have, by necessity and interest, become on-the-job experts on a variety of construction topics. One of these areas has been bringing some semblance of energy efficiency to a structure originally built in 1843. Over time we modernized our home's envelope with plywood sheathing, house-wrap and new cedar siding. We filled marginally insulated exterior walls with fiberglass insulation and hunted down remaining gaps and cracks from the sill beams to the soffits and filled them with spray foam. However, when it came to the original, single-pane, historic wood window sashes we struggled to find a solution. We saw these original windows with their wavy glass and delicate scale as essential to maintaining the character of the structure. We put great effort into restoring them one-by-one only to find that they remained drafty and extraordinarily inefficient. Condensation and ice that would accumulate on the inside of the windows on cold days would serve as both an indicator of this inefficiency as well as a major destructive force to the sashes themselves rapidly undoing our restoration work. Traditional storm windows placed on the exterior only seemed to help marginally with efficiency while trapping harmful moisture in the area between the sashes and the storm window. The traditional exterior storm window, in our opinion, also detracted from the aesthetic of the house's appearance overall.

Here is a lovely old building in Camden NJ. Notice however, the Trolley car tracks! They have trains screeching by less than 15 feet from their windows!

Effective soundproofing requires a tight fit, multiple glazing layers and a large airspace. Insulated glass units rarely have even a one-inch airspace. Primary windows and storms allow 2- or 3-inch airspaces easily and unlike IG units are not mechanically connected together so the sound energy doesn't just buzz through. The more mass you can get between you and the noise the quieter it will be. For the best soundproofing performance across the whole frequency range, you can vary glass thickness and use laminated glass to take advantage of sound reflection that occurs at every boundary

We were part of a project at West Point military academy, where the plan was to add interior storm windows after the primary window restoration. It was in officer's family housing where they needed to remove the old wooden sashes to do offsite lead abatement, so the sashes would be gone for 3-4 weeks.

Because this was occupied housing, they were required to have no more than 50% of the windows boarded up at any one time. Putting plywood in the window openings was going to be expensive and damaging to the original woodwork, and completely unsatisfactory to the residents.

We suggested that the Innerglass Windows should be temporarily installed, instead of boarding up the openings. This resulted in considerable cost savings and happier residents. Scheduling sash removal and re installation was greatly simplified and was able to be done more efficiently.

Historic New England decided to do an energy retrofit project on their headquarters, The Lyman Estate.

This was done in concert with the Massachusetts Dept of Energy Resources. The Massachusetts Historical Commission holds a preservation restriction on the property, so the exterior cannot be changed. Historic New England decided to do interior storm windows in a minimally invasive manner. Their institutional philosophy was when installing non-historic elements, such as storm windows, or more commonly, UV protection in the museum buildings, was to install these elements in the interior as opposed to the exterior. This approach stems from the concept that guests rarely noticed an interior storm window, but on the exterior of the building, these additions are very noticeable- specifically it preserves the aesthetic quality of how the light is reflected off the individual panes of the historic window compared to light reflecting off a single storm pane.

After the Innerglass windows were installed, the Historic New England staff did a series of blower door tests. Their tests found an overall decrease in infiltration of 30% in each room tested. Taking out the Innerglass storms reduced it to 10% so 2/3rds of the infiltration improvement can be attributed to the interior storms. To get this correct, we have quoted several sections directly from the report written by Historic New England.

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Innerglass Window can transform your commercial property's energy usage without compromising it's character.

For the last 25 years my wife and I have been restoring an historic home in Sherman. Our projects have run the entire spectrum of renovation from basement to attic over this time and we have performed the majority of this work with our own hands. We have, by necessity and interest, become on-the-job experts on a variety of construction topics. One of these areas has been bringing some semblance of energy efficiency to a structure originally built in 1843. Over time we modernized our home's envelope with plywood sheathing, house-wrap and new cedar siding. We filled marginally insulated exterior walls with fiberglass insulation and hunted down remaining gaps and cracks from the sill beams to the soffits and filled them with spray foam. However, when it came to the original, single-pane, historic wood window sashes we struggled to find a solution. We saw these original windows with their wavy glass and delicate scale as essential to maintaining the character of the structure. We put great effort into restoring them one-by-one only to find that they remained drafty and extraordinarily inefficient. Condensation and ice that would accumulate on the inside of the windows on cold days would serve as both an indicator of this inefficiency as well as a major destructive force to the sashes themselves rapidly undoing our restoration work. Traditional storm windows placed on the exterior only seemed to help marginally with efficiency while trapping harmful moisture in the area between the sashes and the storm window. The traditional exterior storm window, in our opinion, also detracted from the aesthetic of the house's appearance overall…….more