Minimum has never been an ambition^TM

Refuse the minimum. Think durability, performance and environment.

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Windows

Doors

Façades

Isothermic Sid Lee Photo Copyright Alex Lesage 1

Isothermic Sid Lee Photo Copyright Alex Lesage 2

The Isothermic difference

Isothermic Sid Lee Photo Copyright Alex Lesage 5

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A comprehensive offering

PVC, aluminum, wood, and façade solutions: durable systems designed to adapt to your reality—never the other way around.
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Certified Performances

With 12 Passive House–certified products (PHI and PHIUS) across windows, doors, and façades—along with several models among the most energy-efficient according to ENERGY STAR—we reinforce our commitment to always deliver better for our clients.
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Proof above all

At Isothermic, true performance is proven as a whole. We reject partial or selectively favorable data. A number only has value if it faithfully reflects the product as it is actually manufactured, sold, and installed. For us, it’s another way of going beyond the minimum.

Isothermic is:

100%

Proudly Canadian-made

216 000

Square feet of warehouse and factory space

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The only Reynaers-certified manufacturer in Québec—and one of only six in North America.

#1

The first hybrid and double-hybrid casement window to be certified Passive House in Canada.

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Patents pending

1st

The first and only PVC casement window up to 48 × 96 in. without reinforcement—designed for a spectacular view.

Service to match our products

By your side, from selection to post-installation

Choosing doors and windows can feel complex. Our experts support you at every step to simplify the process and ensure a smooth experience.

Product selection
We guide you toward the solution best suited to your project.
Certified installation
Because optimal performance depends as much on installation as it does on the product itself.
After-sales service
Support that continues long after installation.

Speak with an expert

Enjoy a free, no-obligation consultation with one of our specialists.
By video call or in person at one of our branches, we’ll help you make the right choices, confidently.

Free Consultation

ALREADY KNOW WHAT YOU WANT?

Tell us what you’re looking for to get expert advice and a free quote.

Minimum has never been an ambitionTM