A new window developed by Niwot-based Alpen High Performance Products (Alpen HPP) breaks previous R-value thermal resistance records, a boon for energy-conscious Boulder County residents.
Designers and manufacturers of energy efficient windows and doors, Alpen HPP announced a new product Dec. 7 that delivers an R10 insulating factor—the Zenith Series ZR10 double-film fixed picture window.
The wind...
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