We can supply Alpen High performance windows for your project. If you are located in  a high-elevation area (5,000+ feet), Alpen Windows would make a great option and are compatible with high-elevation areas. With R-Values up to R-10 and fiberglass window frames.

  • 3x Energy Star® rating
  • R-Values up to R-10 (whole window)
  • Passive House Certified with PHI & PHIUS
  • NFRC Certified Windows 
  • Fiberglass Frames
  • 99.5% UV Protection
  • Reduced condensation
  • Increased indoor comfort; warmer in the winter and cooler in the summer
  • Lower energy bills
  • Over 28 years experience in both residential and commercial windows
  • Can contribute to LEED credits

We are an authorized Alpen sales representative. Please contact us through our CONTACT US page if you wish to inquire about or purchase Alpen Windows.

Windows are the weakest link in a homes energy efficiency

Typical dual pane windows have an R-Value of R-2 to R-3 while a high-performance window has an R-Value of R-6 to R-10, making them almost 5 times as efficient. This makes for superior energy efficiency, interior comfort and noise reduction. With Design Pressures of up to DP70 (170-200mph), triple EPDM gaskets, multiple locking points, all of which ensure a superior air and water tight window (<0.03 cfm/ft² Air Infiltration Rating).

Operable windows come in a tilt & turn design, casement, sliding, hopper and the SHGC levels range from 0.17 to 0.48 making them suitable for both hot and cold climates.

Dual Pane vs High Performance Windows - Whole Wall R-Value Average:

For example, if you took a R-50 wall assembly and installed a 15% glazing ratio of dual pane (R-3) windows. That R-50 wall assembly would drop down to a whole wall average of R-15. That is a 70% reduction in R-Value.

Now, take that same R-50 wall assembly and install a 15% glazing ratio of a high-performing (R-8) window. That R-50 wall assembly would now have a whole wall average of R-28. A significant increase in the average whole wall R-Value compared to the standard dual pane window.


The Passive House is the World's Most Rigorous Standard for Energy Efficient Construction