Alpen High Performance Products American Crafted - Proven Performance Super-insulating, High Performance Windows, Doors and Architectural Glass Alpen High Performance Products (Alpen HPP) manufactures super-insulating, thermally efficient residential and commercial windows and architectural glass utilizing three decades of experience incorporating lightweight, suspended-film technology. AlpenGlass super-insulating units are used throughout Alpen HPP's residential and commercial window and door products, as well as in Alpen's architectural glazing solutions. The exceptional thermal performance of Alpen HPP window and glazing solutions grants the freedom to design with maximum glass across all building types and climate zones. Alpen HPP units provide a powerful combination of optimum solar control which blocks summer heat, retaining winter warmth, eliminating harmful ultraviolet rays, and maximizing natural daylight and clarity, providing the ultimate in architectural freedom.