Series 3 - Passive House-Certified Windows

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Durable Windows for the Most Demanding Projects

Designed for passive houses, LEED, Novoclimat, and net-zero constructions, as well as the most ambitious building projects, including those targeting BREEAM Outstanding, the Series 3 combines energy efficiency, durability, and rigorous engineering.

Manufactured in Canada to meet local climate realities, it stands as the benchmark solution for any passive house design. As a trusted manufacturer, Isothermic offers you the necessary expertise to help you achieve the highest standards in residential and commercial construction across Canada.

Series 3 - Passive House (Passivhaus)

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Engineered to Meet the Highest Energy Standards

The Series 3 is a passive house window developed for projects where thermal performance is non-negotiable. Engineered to meet the requirements of passive houses as well as LEED and net-zero buildings, each component achieves superior insulation against the most extreme climate conditions, keeping every space warm in the winter and cool in the summer.
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A Certified Component for the Most Rigorous Projects

Performance at this level must be proven. Series 3 is certified by CSA, NAMI, ENERGY STAR®, AAMA, PHI, and PHIUS, ensuring compliance with the world’s most rigorous standards. A fenestration system trusted for next-generation buildings where precision and accountability matter.
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A Durable Vision of Comfort and Responsibility

Beyond certifications and numbers, the Isothermic Series 3 is built to last. Superior thermal comfort, reduced energy usage, and the rigorous selection of materials come together to create durable passive homes and buildings that are responsible and resolutely forward-looking.

44 mm Triple Glazing

Available exclusively with 44 mm triple glazing, Series 3 was designed to push performance further. The selection of glass, Low-E coatings, and thicknesses can therefore be tailored to the priorities of each project—whether for improved thermal gains, reduced energy loss, or enhanced acoustic comfort. A deliberate choice for those seeking greater quiet, more stable indoor conditions, and superior long-term performance.

Types of windows available in this Series

Casement Window

Designed for maximum performance, the casement window offers exceptional sealing and efficient natural ventilation.

Awning Window

Designed for controlled ventilation, the awning window ensures excellent weatherproofing, even in the rain. Its outward opening contributes to the comfort of contemporary designs.

Fixed window

Maximizing light and visual clarity, the fixed window offers excellent thermal efficiency and superior airtightness. Without an opening mechanism, it presents a clean, architectural presence.

Architectural window

Conceived as a design element in its own right, the architectural window offers total creative freedom, without compromising on performance, comfort and durability.

Rare by design

Rare on the market, Series 3 was designed with the future in mind. It offers the large dimensions and high performance often associated with European products, while relying on a North American opening system—more familiar, proven, and better suited to our reality. A durable, reassuring investment, firmly focused on tomorrow.

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Other series you may be interested in

What certifications are associated with passive house windows and doors?

Passive house-certified windows are validated by two leading organizations: the Passive House Institute (PHI), originally established in Germany, and the Passive House Institute US (PHIUS). Both organizations establish rigorous standards that every certified component must achieve in terms of airtightness, thermal performance, and glazing quality. The standards differ between PHI and PHIUS, but both organizations require that windows be tested and listed before being used in passive house projects.

The Series 3 also holds NFRC, NAMI, ENERGY STAR®, and AAMA certifications, confirming compliance with the most rigorous benchmarks for low-energy buildings. These certifications distinguish true passive house windows and doors from conventional glazing and ensure that they are a reliable, energy-efficient choice for any passive house design project.

Are Isothermic windows manufactured in Canada?

Yes. Isothermic passive windows are manufactured in Quebec, Canada. As a local manufacturer, we ensure rigorous quality control and full adaptation to the most severe climate conditions in the country. When you choose a locally made window and door system, you also reduce the carbon footprint associated with transport while supporting the local economy. Our products that are certified to passive house standards are listed in the PHI component database, making it straightforward for engineers and architects to specify them for any passive house project.

Do you offer passive house windows made of aluminum?

Absolutely! At Isothermic, we believe you shouldn't have to choose between extreme energy performance and modern architectural design.

We offer a total of 12 Passive House certified products, including several high-end options within our Aluminum Series 3.

The MasterLine 10: Our flagship aluminum product that tackles the thermal insulation challenge head-on. Thanks to cutting-edge engineering, it shatters the myth of aluminum's high conductivity to meet the rigorous performance thresholds required by Passive House certifications.
The Best of Both Worlds: You get the exceptional durability, rigidity, and sleek, minimalist aesthetic of aluminum, while benefiting from high-performance fenestration perfectly engineered for Quebec's climate.