Passive House Windows
Low U-value tilt and turn windows for demanding thermal requirements.
What Makes a Passive House Window
Passive house windows are built around one idea: keep heat where it belongs. A window with a very low U-value reduces heat loss through the frame and glass. Our tilt and turn designs use thermal break aluminum frames, triple glazing, and multi-point seals to reach Uw 1.4 W/m²K on the 91 series.
The tilt and turn mechanism itself contributes to everyday comfort. You can tilt the sash inward for controlled ventilation without fully opening the window. A full turn opens the sash like a casement for cleaning or emergency egress. This European hardware standard works with ROTO, SIEGENIA, or CMECH components.
For North American projects, this means a window that supports low-energy building goals without requiring a complete change in how you specify or install windows. The product remains a standard tilt and turn unit with better thermal numbers.
Key Thermal Features
These details work together to reduce heat transfer and improve comfort.
Thermal Break Aluminum
A polyamide strip separates interior and exterior aluminum, cutting conductive heat loss through the frame.
Triple Glazing
Three panes with two insulating cavities, such as 5+16A+5+16A+5, lower the glass U-value and improve condensation resistance.
Multi-Point Locking
Hardware from ROTO, SIEGENIA, or CMECH pulls the sash tight against the frame, compressing the seals for better airtightness.
Low-E Coatings
Low-emissivity coatings on glass reflect heat back into the room while still allowing natural light.
91 Series Thermal Break Specifications
The 91 series aluminum tilt and turn window offers the lowest U-value in our range.
| U-value | Uw 1.4 W/m²K |
|---|---|
| Sound reduction | Rw 37 dB |
| Frame material | 6060-T66 aluminum, 1.8 mm (2.0 mm local reinforcement) |
| Glass | 5+16A+5+16A+5 triple glazing |
| Hardware | ROTO, SIEGENIA, or CMECH |
| Certifications | ENERGY STAR, NFRC, CSA |
| Opening | Tilt and turn |
| Built-in blinds | Optional |
Exact specifications depend on the glass package, hardware selection, and project requirements.
Related Window Types
Compare passive house windows with other tilt and turn options.
Specifying for Low U-Value Projects
When a project calls for passive house windows, the first number to check is the whole-window U-value. Uw 1.4 W/m²K on the 91 series comes from the combination of a thermal break frame, triple glazing, and a well-sealed sash. The frame material matters less than the thermal break design. Aluminum conducts heat quickly, so the break must be wide enough and positioned correctly.
The tilt and turn hardware also plays a role. A multi-point lock pulls the sash against the frame at several points, not just one. This even pressure keeps the gaskets compressed and reduces air leakage. For builders and dealers, this means the window performs consistently across different sizes and installation conditions.
Questions buyers ask
What should I look for in passive house window manufacturers?
Look for manufacturers who publish whole-window U-values, not just center-of-glass numbers. Ask about the thermal break design, glass options, and hardware brands. A manufacturer should be able to provide test data or certification documents for the specific window series you are considering.
Do you offer passive house doors as well?
We focus on tilt and turn windows on this site. For doors, the same thermal principles apply: thermal break frames, low-E glass, and multi-point locking. Contact us with your door requirements and we can discuss options from our broader product range.
Can I get a Uw 1.4 window in custom sizes?
Yes, the 91 series is made to order. Custom sizes affect the overall U-value slightly because the frame-to-glass ratio changes. Our technical team can calculate the expected U-value for your specific dimensions before you order.
How do I verify the thermal performance of your windows?
The 91 series has ENERGY STAR, NFRC, and CSA certifications. These documents list the tested U-value and other performance metrics. We can provide copies for your project documentation.
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