About 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 performance levels well below basic code minimums, making them relevant for Passive House projects, net-zero buildings, and high-performance residential and commercial construction.
Alpen's window and door line spans fiberglass and glass-reinforced uPVC systems, including casement, awning, fixed, single-hung, double-hung, tilt-turn, and door configurations. The product platform is built around advanced triple-pane and quad-pane insulated glass packages, warm-edge spacers, low-E coatings, and gas fills selected for climate-specific performance.
Headquartered in Colorado, Alpen serves projects across the United States through consultation, dealer, and project channels. The company is especially relevant for architects, builders, Passive House consultants, and owners comparing domestic high-performance fenestration options against imported European systems.
Company Snapshot
Product Lines
Zenith Series
Fiberglass high-performance windows and doors built around advanced glazing, strong thermal performance, and residential or commercial specification support.
- Casement, awning, fixed, single-hung, and double-hung windows
- Door configurations coordinated with high-performance window packages
- Triple-pane and quad-pane insulated glass options
Tyrol Series
European-inspired glass-reinforced uPVC windows and doors for Passive House, net-zero, and energy-code-driven projects.
- Tilt-turn and fixed window configurations
- Passive House certified options
- Thermally efficient frames and warm-edge glass packages
Commercial and Retrofit Glass
Commercial windows, insulated glass, and secondary window systems for projects that need better thermal performance without conventional replacement assumptions.
- Aspekt+ commercial windows
- WinSert secondary window systems
- AlpenGlass insulated glass units for window companies and glaziers
Common Applications
Passive House and Net Zero
Residential and commercial projects where low U-factors, airtightness, comfort, and verified performance are primary design drivers.
Custom Residential
Homes requiring climate-specific glazing packages, durable frame materials, sound reduction, and custom operating types.
Commercial Retrofit
Existing buildings that need improved envelope performance through commercial window, insulated glass, or secondary window approaches.
What To Know
High-performance glazing focus
Alpen is built around lightweight triple-pane and quad-pane glass technology paired with fiberglass or fiber-reinforced uPVC frames.
Passive House track record
The company has public PHIUS and PHI Passive House certification history and is positioned for projects with aggressive energy targets.
Coordinate glass package early
Performance depends on frame series, operation type, glass makeup, low-E coating, gas fill, spacer, orientation, and climate zone.
Editorial profile based on Alpen High Performance Products public product and company materials; last reviewed April 30, 2026.