Now Available: Phius Certified Windows

More choice for Performance. More freedom for design.

Passive House projects shouldn’t force you into a single window system. That’s why we’re excited to introduce Phius Certified Windows from Eurostar—giving our customers more certified options to work with, without compromising the design intent.

We didn’t start with niche products. We started with the window systems architects and homeowners are already choosing, so more projects can benefit from certified high-performance windows today.

And this is just the beginning.

We’re continuing to bring more of our lineup through certification, giving you an expanding range of high-performance options to choose from as your projects—and your designs—evolve.

The Certified Lineup

EcoFibra 76 ThermoFibra - Fiberglass-reinforced uPVC
A hybrid uPVC system with continuous fiberglass reinforcement for enhanced thermal performance, rigidity, and dimensional stability. A strong choice for high-performance residential projects where energy efficiency and refined detailing matter.

ASH80 - Aluminum / polymer hybrid
Combining an aluminum exterior with a high-insulation polymer core, ASH80 delivers the look and durability of aluminum with enhanced thermal and acoustic performance—well suited to contemporary residential and high-performance architecture.

Decalu 88 - Thermally broken aluminum
A high-performance aluminum system offering refined sightlines, substantial glazing capacity, and strong thermal performance. Designed for contemporary residential and commercial architecture where expansive glazing and minimal detailing are central to the design.

Gemini Quadrat 78 - Wood / aluminum composite
A timber-aluminum system that pairs the warmth and character of wood on the interior with a durable, low-maintenance aluminum exterior. An ideal fit for design-led residential architecture where materiality, performance, and longevity come together.

And we’re not stopping here.

More certified systems are on the way, expanding the possibilities for high-performance window design.

Let’s Talk About Your Next Project
Curious about the certified systems or how they could work for your next project? Want your team to see the products up close? We'd love to share a lunch and learn session. We’ll bring the product expertise—and the lunch. You bring the questions. All you have to do is submit the form below.