• SeriousWindows. SeriousWindows are the most energy-efficient residential windows on the market today, the company claims. This Denver net-zero-energy project features Serious Windows with tuned glazing customized to the home’s solar orientation. http://seriouswindows.com
    SeriousWindows. SeriousWindows are the most energy-efficient residential windows on the market today, the company claims. This Denver net-zero-energy project features Serious Windows with tuned glazing customized to the home’s solar orientation. http://seriouswindows.com
 6. SUPER-EFFICIENT WINDOWS
The time has come for super-high-performance windows to catch on with American homeowners, Wilson predicts, especially in colder regions.

Introduced last year, Serious Windows’ ThermaProof windows, for instance, use a combination of low-E glass coatings, suspended low-E films, and xenon gas fill to achieve a unit insulating value up to R-13 (instead of the standard U-value rating, the company utilizes R-value, which measures resistance to heat loss). “That’s extraordinary performance,” Wilson says, although he notes that the windows are 20% to 30% more expensive than double-glazed low-E units.

The green building expert believes more American manufacturers soon will offer competing products, eventually lowering prices. Another high-performance option, triple-glazing, already is offered by some companies, including Marvin and Weather Shield.
 
“Triple-glazed windows will be taken seriously and as that happens other [leading] manufacturers are going to get involved,” he says.

The DOE recently announced plans to create a volume-purchase program for R-5 and low-E storm windows, which would make them more price-accessible to smaller builders.

In addition, Wilson predicts that pros will begin specing different glazings for different orientations of a home, further improving energy performance.