Windows for
Passive House & Net-Zero Buildings — Every Climate
European triple-pane windows are no longer a luxury. They are the technical foundation of every serious Passive House and net-zero project — regardless of climate zone.
Roberts Windows supplies certified high-performance systems engineered to meet or exceed the most demanding energy standards in the United States, from the desert heat of Arizona to the cold winters of the Northeast.
Hot & Arid Climates — Arizona, Nevada, New Mexico
In Phoenix, Las Vegas, or Albuquerque, the enemy is solar heat gain. Cooling loads dominate the energy budget, and the wrong windows can make air conditioning both inefficient and expensive.
What matters here:
- - SHGC (Solar Heat Gain Coefficient): As low as 0.18 — blocking over 80% of solar radiation before it enters the building.
- - U-Value (Uw): As low as 0.151 BTU/h·ft²·°F — keeping conditioned air inside and heat outside.
Our systems meet and exceed ENERGY STAR Version 7.0 requirements for the South-Central zone (U ≤ 0.40, SHGC ≤ 0.23).
Cold & Mixed Climates — New York, New Jersey, Washington DC, Midwest
In colder climates, the priority shifts to thermal retention. Triple-pane glazing with warm-edge spacers and inert gas fills creates a thermal barrier that dramatically reduces heating demand — the core principle of Passive House design.
What matters here:
- - U-Value (Uw): As low as 0.100–0.141 BTU/h·ft²·°F — among the lowest available on the US market.
- - SHGC: Optimized to allow passive solar gain in winter while maintaining summer comfort.
Our systems meet and exceed ENERGY STAR Version 7.0 requirements for the Northern zone (U ≤ 0.22, SHGC ≥ 0.17).
Why European Windows?
American window manufacturing has historically prioritized cost and speed. European systems are engineered around a different standard — thermal performance, longevity, and airtightness.
Roberts Windows works directly with leading European manufacturers — VEKA, Cortizo, Reynaers — to supply systems that American production simply does not match at any price point.
- - Triple-pane glazing as standard
- - Thermally broken aluminum and uPVC profiles
- - Tilt & turn hardware for precision ventilation and cleaning
- - Full documentation for Passive House certification projects
Ready to Specify?
Whether you are an architect designing a certified Passive House, a builder working on a net-zero development, or a homeowner who wants to do it right — we can provide full technical specifications, U-value calculations, and climate zone compliance documentation for your project.
Contact us — we respond within 24 hours.