In April I wrote about the Advanced Energy Panel, on sale through August. These interior storms can make a decent primary window perform close to the best window money can buy, all without construction mess or cost.
Now a Vermont company has become a dealer/manufacturer for another interior storm window: The Indow. These storm windows are a single pane of acrylic fitted with a weatherstrip around the frame. Compared to the Advanced Energy Panel (also known as WindowTherm), it’s easier to fit the Indow to your existing window opening because there are no fasteners involved.
To recap the benefits of interior storm windows…
- a well-fitted interior storm window does a lot to control condensation on the primary window, which looks nice and can keep the paint and wood trim in good shape
- interior storms improve the heat-retention of your primary window and can improve comfort to the point that a window replacement may be unnecessary, even in a zero energy home
- they do not complicate the exterior look of classy old windows, and in the summer they’re not even there!
- with care I’d venture interior storms can last more than a decade since they are out of the weather
And, there are a few drawbacks to point out…
- primary among them: you have to install and remove the storms every year, and store them somewhere safe
- the original window is still out in the weather, so they continue to wear and that may lead to replacement in the end even if your interior storm window is awesome
- you can’t open the window without removing the storm (only an issue in the winter)
- the Indow, with only one layer of “glazing”, doesn’t insulate as well as the Advanced Energy Panel
As to price, I can’t compare the two options, but you can! With the AEP sale still going on, and the Indow new to Vermont, give the dealers a call and get some costs for your home. The Indow dealer is EnergySmart of Vermont.