Alpen High Performance Products

Alpen High Performance Products manufactures ultra-high-performance windows and doors engineered for superior energy efficiency, long-term durability, and occupant comfort. Built on decades of research in building science and thermal performance, Alpen products consistently achieve U-factor ratings as low as 0.15 — well below code minimum — making them the go-to choice for Passive House projects, net-zero buildings, and high-performance residential construction.

Alpen's window line spans casement, awning, double-hung, fixed, and specialty configurations, all built with fiberglass frames, thermally broken sash systems, and triple- or quad-pane insulated glass units filled with krypton or argon gas. Their dedication to manufacturing excellence is matched by a robust technical support team capable of assisting architects, contractors, and developers through every phase of a project.

Founded in Boulder, Colorado, Alpen HPP has supplied high-performance fenestration to projects across North America, from mountain-climate custom homes to institutional and multifamily developments seeking LEED Platinum, PHIUS, and PHI Passive House certification.