High-Performance Aluminum Windows

At Isothermic, we manufacture high-end aluminum windows in Quebec using architectural systems from Reynaers Aluminium, globally recognized for their engineering precision, refined aesthetics, and advanced performance. As a certified Reynaers manufacturer in Canada, we combine European design, Quebec manufacturing, and deep building envelope expertise to create solutions designed to last. Well beyond the industry’s minimum standards.

Durability Designed for Demanding Climates

Aluminum is an exceptionally stable material. Unlike other materials, it resists UV rays, humidity, extreme temperature fluctuations, and freeze-thaw cycles without warping, cracking, or losing its structural integrity.

Engineered to withstand the realities of the Canadian climate, our windows maintain their appearance, airtightness, and performance year after year. Their durable finish and low-maintenance nature make them a preferred solution for high-end residential, multi-residential, and contemporary architectural projects.

Thermal and Acoustic Performance Without Compromise

Modern aluminum windows bear little resemblance to older generations of cold-conductive products. Thanks to advanced thermal breaks, insulated chambers, and high-performance glazing, Reynaers systems manufactured by Isothermic achieve some of the highest levels of energy performance in the industry.

Several of our configurations are designed to meet the requirements of Passive House-certified projects, where every component of the building envelope contributes to reducing energy loss, improving interior comfort, and optimizing overall building efficiency.

Available with double or triple glazing and specialized glass options, our windows also provide:

• significant reduction in heat loss;
• improved comfort near window openings;
• optimized solar control;
• superior sound insulation in urban or high-density environments.

Architectural Freedom Without Limits

Aluminum pushes the boundaries of design thanks to its exceptional structural strength and slim sightlines. The result: larger glass surfaces, clean contemporary lines, and increased natural light.

From contemporary residences to large-scale institutional and commercial projects, Reynaers systems offer extensive design flexibility:

• expansive openings;
• corner glazing;
• ultra-slim profiles;
• multiple configurations and finishes;
• a wide selection of durable colors and textures.

Every window is custom-designed to integrate seamlessly with the project’s architecture, without compromise between performance and aesthetics.

A Performance-Driven Approach

At Isothermic, we believe a window should do more than simply meet minimum standards,  it should actively contribute to the building’s durability, comfort, and long-term value.

That is why we prioritize proven systems, rigorous local manufacturing, and solutions capable of meeting the expectations of the most demanding architects, developers, and homeowners.

Isothermic offers three aluminum window series, each tailored to a different performance level:

• SlimLine38: A thinner frame and a clean aesthetic make this a popular choice for modern windows in residential construction. This is the ideal option for homes focused on a thin, discreet profile and a contemporary look.
• MasterLine8: Advanced performance built to handle large windows and ambitious glazed compositions.
• MasterLine10: The highest-performance variant in our line. Optimized with a thermal break that acts as a barrier against energy loss, it delivers the kind of performance associated with leading European systems such as Reynaers. The right solution for the most demanding energy-efficient building projects.

A window comparison tool is available on our website to help you identify the series best suited to your situation.

Yes. Isothermic aluminum windows are built for residential and commercial construction alike, without compromising on quality. A key feature of our aluminum windows is their structural strength, combined with resistance to UV and moisture. This allows them to accommodate large windows of virtually any size.

They are a particularly strong choice for multi-unit buildings, commercial properties, and high-end homes across Canada. These windows come in configurations that create light-filled, open spaces without compromising the integrity of the building envelope.

We offer several opening types: casement, fixed, hopper, single-hung, architectural, sliding, arched, tilt-and-turn, French casement, etc.

Isothermic is a family-owned, 100%-Canadian company. Our aluminum windows are manufactured in Canada, in our 216,000-square-foot facility. Our rigorous manufacturing process, backed by 8 pending patents, allows us to actively invest in innovation in order to improve the performance and longevity of our products.

On the durability front, the aluminum profiles used are resistant to UV rays and moisture, with no warping or corrosion over time.

Our products are rigorously certified, surpass industry standards, and meet energy efficiency requirements. This commitment to durability is at the core of our philosophy: designing aluminum windows with an appearance and performance that hold up year after year, with minimal upkeep.

Getting a quote from Isothermic is simple and completely free. If you need a quote, you can meet with a specialist on our team online or in person to discuss your aluminum window project. A four-step questionnaire is also available on our website to guide you toward the series best suited to your needs.

As for installation, this is carried out by certified installers trained on our products and according to the most rigorous standards.