Alpen High Performance Products
High-performance fiberglass windows engineered for Passive House and net-zero homes.
What they're known for
A Colorado manufacturer producing multi-pane fiberglass windows and insulated-glass systems at the high end of US residential thermal performance.
Alpen High Performance Products manufactures fiberglass windows, doors and insulated-glass systems for high-performance residential construction. Its Zenith line includes configurations aimed at Passive House, net-zero and very-low-load buildings, with published NFRC and certification data across the product family. For Compound, Alpen is a major domestic fenestration manufacturer connecting building-envelope design to measurable whole-window performance.
Notable projects
- Oak Park, IL
Oak Park Phius Zero historic renovation
Residential project documented with Alpen Zenith windows.
Notable products
We haven't catalogued their full line in the directory yet. These are the entries worth knowing.
- Catalog entry
Zenith Series
High-performance fiberglass window line
- Catalog entry
WinSert
Interior secondary-window retrofit system
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Sources
Facts verified September 2026. Compound is an independent editorial directory and is not affiliated with this company unless stated.