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. Alpen is a major domestic fenestration manufacturer connecting building-envelope design to measurable whole-window performance.
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.