Frequently Asked Questions

What do they do?
Interior storm windows provide a layer of additional "insulation" for your windows. It turns single pane windows into double glazed windows or double glazed windows into triple glazed ones. Additionally, they seal air-tightly against the existing window frame and eliminate air infiltration. Measured reductions in sound and heat transfer are often on the order of 60% or more with properly installed windows from D.W. Philpot Company.
How do these windows work?
An interior storm window mounts magnetically to a metal strip that is installed inside your existing window opening. You leave your window inplace, and snap in the window to provide insulation. The dead air trapped in the air gap between the existing window and the interior storm window inhibits heat transfer and controls condensation. It uses a shatter resistant plexiglass pane (a better insulator than glass) mounted in an innovative PVC molding to maximize its insulative value. Since the entire window is made from highly insulative plastic, the window itself provides much greater insulation than aluminum framed windows, or vinyl windows with glass panes.
If acrylic is so good, why aren't my windows made of it already?
Acrylic is much stronger than glass, and it is also a much better insulator. Acrylic is also available with tinting or UV blocking characteristics for museums and medical applications. The reason it is not in widespread use as a glazing material has to do with its heat expansion properties. Acrylic will expand and contract when heated or cooled, enough that it cannot be permanently affixed in a solid frame. The innovative molding design allows us to use it across a wide range of temperatures and manage the acrylic's expansion without bowing or frame breakage.
How do I install them?
We will accurately measure your window opening and order a custom built interior storm window to suit your application. And from a number of different mounting options, we will choose the best one to fit your existing window. We attach a steel mounting angle around the rim of your window opening, and then installing the window is as easy as snapping the magnets into place. The total installation can be done in less than an hour, with no disruption to your living space whatsoever.
What about soundproofing?
The innovative molding design serves to block sound as well as cold. Sound deadening on the order of 60% is typically measured in noisy areas.
How much do they cost?
They are priced according to size. Contact us for more information. The total cost of adding an interior storm window is a fraction of the cost of total window replacement, and you can do it at any time of year with no disruption.
Can I remove them, and open my windows on a nice day?
You can simple snap them out and store them whenever you wish. We also offer a self-storing option for sash windows where you can remove the bottom of a two-piece split storm window and store it magnetically on the top part of the window for a slightly higher price.
How do I get them?
Contact us for more information.