by pushing the limits of performance with ultra-efficient, luxury-grade windows engineered for modern sustainability.
Alpen’s average production leadtime for standard materials is 2-11 weeks.
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The Alpen Tyrol Collection brings European design and performance to North America with uPVC frames reinforced by continuous fiberglass for strength and insulation. With ratings up to R-11 (U-Factor 0.09), Tyrol delivers over three times the insulating power of a standard Energy Star double-pane. Tilt-turn and hopper operations with multi-point seals ensure airtightness, while triple and quad-pane glazing options provide durability and comfort. Tyrol offers premium functionality and unmatched energy performance.
The Alpen Zenith Collection features North American–style windows with pultruded fiberglass frames that resist warping, swelling, and fading. With ratings up to R-10 (U-Factor ~0.10), Zenith provides five to ten times the insulation of typical double-pane windows. Triple and quad-pane glass improves comfort, lowers energy costs, and blocks 99.5% of UV rays. Available in casement, awning, and fixed styles, Zenith offers efficiency, durability, and versatile design for a wide range of homes.
High-performance windows are designed with advanced materials, multiple panes, and low-E coatings that dramatically improve insulation. In Southern California, where cooling costs can be high and the sun is intense, these windows reduce energy loss, cut air-conditioning bills, and make homes more comfortable year-round.
Installing high-performance windows in Los Angeles, San Diego, or Orange County can reduce heating and cooling costs by 20–40% compared to standard double-pane windows. Lower utility bills plus California rebate programs make the investment even more valuable.
R-value measures how well a window resists heat loss (higher is better), while U-factor measures heat transfer (lower is better). Most standard windows are only R-2 to R-3, but premium windows like Alpen’s Tyrol and Zenith collections reach R-10 to R-11, ideal for meeting California Title 24 and CALGreen codes.
Title 24 requires strict energy efficiency in new construction and remodels. High-performance windows lower a home’s energy demand, helping builders and homeowners meet or exceed code compliance, qualify for green building credits, and avoid costly redesigns or energy penalties.
California requires all new homes to be Net Zero Energy, meaning they produce as much power as they use. Because windows are a major source of energy loss, high-performance glazing is essential to reduce demand, making solar panels and renewable energy systems more effective.
Yes. Passive House standards demand extremely airtight, insulated construction. High-performance windows with tilt-turn or casement designs, triple or quad glazing, and U-factors below 0.15 are critical to hitting Passive House targets in coastal, desert, and mountain regions across California.
Absolutely. In Southern California’s sunny climate, these windows prevent hot spots, reduce glare, and block up to 99% of UV rays that cause fading. They also eliminate drafts and reduce outdoor noise, creating a quieter, more consistent indoor environment.
Beyond lower monthly bills, energy-efficient windows boost home resale value in California’s competitive real estate market. Buyers increasingly prefer sustainable, Net Zero-ready homes, and upgraded windows often make listings more attractive to eco-conscious and cost-sensitive buyers.
Standard double-pane windows (R-2 to R-3) meet only the minimum requirements. High-performance windows, with R-10+ ratings, are up to five times more efficient, reducing cooling loads in hot inland areas and retaining warmth in coastal or mountain zones.
Partnering with a local supplier ensures proper product selection and installation. Designer Window Supply provides Alpen’s Zenith and Tyrol collections along with expert consultation to meet Title 24, Passive House, and Net Zero requirements in San Diego, Los Angeles, and surrounding areas.
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Learn more about the warranty information for all Alpen windows.
