Alpen Windows is your source of high quality, energy efficient windows in a variety of frame materials. We offer a wide range of products featuring Heat Mirror® films in our windows that can substantially reduce heat from the sun and greatly increase window insulation. Heat Mirror® is a low-emissivity, coated film suspended inside an insulating glass unit. The two airspaces created by the suspended the film further increase the window's R-value.

All Heat Mirror products can be used with virtually any type of glass - clear, heat absorbing, reflective, heat-strengthened, tempered, laminated - to achieve superior performance in a wide range of aesthetics.

Vinyl Windows - Alpen searched the world to find the highest quality vinyl stock, then engineered windows built to last as long as your home. Alpen vinyl's chemical composition provides industry-leading resistance to degradation due to brittleness, discoloration through UV exposure, warpage, expansion and contraction.

Most new and replacement windows sold in Colorado are designed and manufactured for national markets, not for Colorado "desert" summers, "arctic" winters, high winds and intense UV radiation. Alpen, in contrast, has engineered a window truly equipped for decades of maintenance-free, high-performance operation here in the Rocky Mountains. As an added bonus, our heavily engineered frames give us the flexibility to manufacture large windows, well beyond the capabilities of our Colorado competitors.
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Fiberglass Windows - Fiberglass frames are designed to take advantage of the material's inherent strength, permitting low profile windows with greater viewing area. With a thermal conductivity that is 1/5000th of aluminum, fiberglass provides superior comfort and insulation. Because the frames are 60% glass, the entire unit has good dimensional stability, resulting in less wear and tear on the seals. Fiberglass is available in a range of colors, and can even have different interior and exterior colors.
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Wood Windows - Alpen offers a complete window and door line of metal clad wood windows. Enameled metal claddings create a permanent weather-resistant surface and have lower maintenance requirements, while retaining the attractive wood finish on the interior. Our wide window sash pocket allows us to provide customers with the industry’s highest performance metal clad wood window.
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How Heat Mirror Works: 1. External radiated heat is reflected. 2. Direct heat from the sun is reduced. 3. Internal radiated heat is reflected.

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ALPENGLASS

Alpen has exclusively manufactured very high-performance glass based on suspended coated films for 25 years.  Acting as wavelength selective filters, these weightless central films create "triple" Alpenglass with a double interior interspace to enhance both thermal and acoustic performance.  Alpenglass holds the industry's highest IGCC "A Level" longevity rating for both dual-seal polyurethane and dual-seal silicone perimeter sealants.  Alpenglass spacers are either steel (to reduce thermal transmission by 80% relative to aluminum) or polyester-capped to both save energy and minimize perimeter condensation.  Spacer color options range from mill finish to black.  

As generated by Lawrence Berkeley Laboratories Window 5.2 software, the following four glass options are standard in Alpen Windows:

Alpenglass HM-88 is ideal for north, east and properly-designed  southern exposures in colder climates.

Alpenglass HM-77 reduces solar-heat transmission 21% relative to HM-88 to moderate mid-day and afternoon overheating.

Alpenglass TC-88 is "twin coated" to increase the insulating capacity or R-value 47% above standard HM-88.

Alpenglass SC-75 is “solar control” glass ideal for south and west elevations that may overheat in warmer climates - 65% of inbound solar heat is blocked.

The Solar Heat Gain Coefficient (SHGC) indicates the percentage of solar heat entering a window (sash, frame and glass) relative to a hole of the same size in the wall.

R-value is a measure of resistance to heat loss or insulation capacity.  All Alpenglass can be significantly enhanced in insulating performance through argon gas filling.  Now standard in 90+% of Northern European windows, argon/krypton gas filling is safe and long-lasting. Argon-filled Alpenglass TC-88 raises R-value to 7.0 (equal to 7 panes of standard glass).

Technical Notes:  (1) The TC-88 Argon R-7 Alpenglass value can be increased to R-15.2 with two films and complementary low-e glass.  (2) HM-88 and HM-77 are coated during a "single pass" through Southwall Technologies' vacuum-deposition process .  TC-88 and SC-75 pass twice through this "planar magnetron sputtering" chamber.  "TC" designates a "Twin Coat" (one on either side of the film), and "SC," designating "Solar Control" is double coated on the same side of the film to sharply cut off infrared radiation just below the threshold of human-eye visible light. (3) Krypton gas is used when narrower sashes require glass-film "interspaces" less than 1/2".

UV BLOCKAGE

All Alpenglass blocks 99.5% of ultraviolet radiation to a wavelength of 380 nanometers.  The best low-e double glazing transmits 20 times as much damaging UV radiation.  Since UV energy accounts for approximately 2/3^rds of fading, and further considering that UV intensity increases with elevation at roughly 3% per 1,000 feet, the protection provided to both furnishings and occupants by Alpen Windows is often of primary interest to home and business owners.

SOUND CONTROL

The "triple" suspended-coated film construction of Alpenglass, plus wide sashes, give Alpen Windows a Sound Transmission Class (STC) advantage of 2-3 points over competitive windows of similar dimension.  This sound-deadening performance can be further enhanced with two films, dissimilar glass thicknesses, staggered-dimension interspaces and the specification of one or two outer lites of laminated glass.  Alpen Windows can also be fabricated with the latest "acoustic PVB laminated" technology, increasing STC performance by 1-2 points and minimizing temperature sensitivity.

CONDENSATION RESISTANCE

Condensation forms on a window glass sash or frame surface when its temperature matches the "dewpoint" of the adjacent air.  When the air's relative humidity increases, the window dewpoint also rises. 

By significantly raising the winter temperature of interior glass, sash and frame temperatures, Alpen Fiberglass Windows virtually eliminate condensation.  The risk of mold damage, directly related to glass condensation, is also reduced.  Under "Winter" conditions (70 inside / 0 outside with a 15 mph wind), Alpenglass will have a center temperature in the range of 62 to 65 degrees.  Edge of glass, sash and frame temperatures are similarly enhanced relative to all competitive windows due to Alpen's wide fiberglass profiles.

N-S-E-W "TUNING"

As the United States window industry has raced to embrace the heat blocking properties of "low-e squared" glass, customers with intelligent passive solar designs are increasingly challenged to find windows enhancing the transmission of north, east and south solar warmth.  Alpen stresses directional "tuning" to complement the most sophisticated energy architecture, extending to natural lighting as well as passive solar heating.  Unprotected south and west facing Alpen Windows are most often equipped with super cool Alpenglass, exceeding the SHGC performance of any low-e, and sometimes including a subtle, light tint in the outer pane.  Sloped and skylight Alpenglass may be further reduced in solar-heat transmission through the specification of specially engineered coatings.

RADIANT WINDOW COMFORT

Throughout its 25-year history, Alpen has observed the most appreciated benefit of its super-insulating technology to be comfort.  Though virtually impossible to quantify, architectural-energy scientists such as Ole Fanger of Denmark, Steven Orfield in Minnesota and Greg Franta of the Rocky Mountain Institute's ENSAR have observed that raising winter "mean radiant temperature" leads occupants to reduce thermostatic air temperature to achieve an equivalent level of comfort.  Reciprocally, cool interior Alpen Window glass and frame temperatures during summer air-conditioning periods reduce chiller loads, and may even eliminate the need for refrigerated air.

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Alpen is continually refining its residential and commercial windows to complement sustainable architecture.  We are focused on lean manufacturing, architectural beauty, longevity, delivery speed, health, comfort and minimal environmental impact.  We welcome your inquiries and input toward accelerating this evolution..