Windows Manufacturing and Installation Across Canada

As central elements of the building envelope, our windows are designed with the conviction that the acceptable minimum is never an ambition.

PVC and Hybrid Window Series

This series combines advanced thermal performance with intelligent design to deliver reliable, cohesive, and durable solutions. Also known as vinyl windows, Isothermic's PVC and hybrid lines are engineered to deliver excellent energy efficiency for your home.

Isothermic Sid Lee Photo Copyright Alex Lesage 9

SERIES 1 — The right choice

Proven, reliable performance, budget-conscious
SERIES 2 — The best choice

Advanced performance, innovation and large formats
SERIES 3 — The future-ready choice

Passive House, ultra-high performance, carbon-neutral vision

Aluminum Series

This series offers architectural solutions for residential and commercial projects, combining large formats, clean design, and durable performance. It also adapts to different requirements and budgets without compromising on quality. The materials used and the many available colour finishes allow every project to be customized to meet architectural requirements.

Fenetre Aluminium Masterline8 Text Image

Wood Windows

A noble and warm material, wood brings a natural and timeless dimension to architecture. It stands out for its insulating properties and authentic aesthetic, offering a refined balance between performance and character. It's an ideal choice for any renovation or new construction project that values character and durability.

Types of windows available in Series 1

Casement Window

Designed for maximum performance, casement windows offer exceptional airtightness and effective natural ventilation.

Awning Window

Designed for controlled ventilation, awning windows provide excellent weather resistance, even in the rain. Their outward-opening sash adds to the comfort of contemporary projects.

Sliding Window

Isothermic Sid Lee Photo Copyright Alex Lesage 11

Designed to optimize space, sliding windows offer smooth ventilation and intuitive operation. Their horizontal opening supports durability and integrates seamlessly into contemporary architecture.

Hung Window

Classic and high-performance, double-hung windows offer flexible ventilation thanks to their vertical sashes while preserving a timeless architectural aesthetic.

Fixed Window

Maximizing light and visual clarity, fixed windows offer excellent thermal efficiency and superior weather resistance. Without an opening sash, they create a clean architectural presence.

Architectural Window

Designed as full design elements in their own right, architectural windows offer complete creative freedom without compromising on performance, comfort, or durability.

Bow and Bay Window

Making a bold architectural statement, bow or bay windows create additional interior space while maximizing natural light, with no compromise on comfort or performance.

French Casement with Cremone Bolt

These windows offer old-world charm reimagined with modern technologies, blending aesthetics, functionality, and ease of maintenance.

Tilt-and-Turn Window

Combining European engineering with everyday versatility, tilt-and-turn windows feature a smart dual-opening system that maximizes ventilation, security, and comfort without compromising on energy performance.

When Should You Consider Replacing Your Old Windows?

Window replacement becomes necessary when you notice drafts, condensation between the panes, water infiltration or damage, difficulty opening or closing your windows, or rising heating bills. Aging windows compromise the thermal insulation and weather resistance of your home. Don't wait too long to replace them.

By replacing your existing windows with Isothermic models, you improve indoor comfort, reduce energy costs, and increase your property's value.

What Window Opening Types Does Isothermic Offer?

Isothermic offers an extensive range of window types to meet all your architectural and functional needs: casement, awning, sliding, double-hung, fixed, architectural, bow/bay, French casement, and tilt-and-turn. Each opening style is available in several materials:

PVC,
hybrid,
aluminum, etc.

Isothermic's custom windows are available in many sizes, including formats up to 48 in × 96 in without reinforcement.

What Is the Installation Process with an Isothermic Professional?

To properly plan your installation project and get the best possible result, hiring a certified Isothermic installer is the wisest decision. The window installation process follows a rigorous sequence: a specialist visits your home first for precise measurements and provides you with a free quote tailored to your project.

On installation day, the professional installers work one window at a time, using protective barriers to maintain the interior temperature and protect your living space. The crew carefully removes your old windows, keeps the work area clean, and hauls away all the debris before moving on to the next step. Once the windows are installed, the installation team goes over every detail to ensure the highest standards of quality, reviewing the workmanship from start to finish and taking care of any touch-ups needed.

How Can You Improve the Insulation and Weather Resistance of Your Windows?

Improving the insulation and weather resistance of your windows involves several factors related to the window installation:

the choice of glazing (double or triple);
the quality of the seals;
the care taken with framing during installation;
installing flashing around the windows to protect against air infiltration and water damage;
the performance of the chosen frame profile.

To properly secure the window in place and ensure that it is fully weathertight, applying a silicone sealant around the entire frame perimeter is also recommended. Any cracks or gaps should be repaired promptly; if left untreated, they can lead to more serious damage over time.

Isothermic has 12 Passive House-certified products (PHI and PHIUS) and several ENERGY STAR-certified models; these are the most stringent benchmarks for excellent energy efficiency. Careful installation and thorough caulking are essential to ensure lasting weather resistance.

To improve the insulation and airtightness of your windows, it’s important to view the window as a complete system: glazing, frame, installation, and air control. Even an excellent window will underperform if the installation or seals are deficient.

Here are the most effective improvements, from the simplest to the most comprehensive:

1. Check Weatherstripping and Seals - Over time, seals can dry out, compress, or crack.

Common signs include:

drafts or air leakage;
condensation near the frame;
excessive exterior noise;
cold spots around the window.

Solutions:

replace worn weatherstripping;
adjust hardware pressure settings;
redo exterior caulking if cracked.

Exterior caulking is often overlooked, even though it plays a critical role in preventing air and water infiltration.

2. Upgrade the Glazing - Glazing has a major impact on thermal performance.

The most effective options include:

Low-E double glazing with argon gas;
triple glazing for cold climates;
high-performance warm-edge spacers to reduce condensation.

Triple glazing is especially beneficial for:

improving comfort near windows;
reducing heat loss;
enhancing sound insulation.

3. Reduce Thermal Bridging in the Frame - A poorly designed frame can allow significant energy loss.

Higher-performance frames typically feature:

multiple air chambers;
optimized reinforcements;
well-insulated PVC/aluminum hybrid materials;
effective thermal breaks.

High-performance and Passive House-certified windows push this approach even further.

4. Ensure Proper Installation - This is probably the most underestimated factor.

Poor installation can lead to:

air infiltration;
condensation inside walls;
significant loss of energy performance.

How Long-Lasting Are Isothermic Windows, and Is There a Warranty?

Isothermic doors and windows come with a limited lifetime warranty, for lasting peace of mind, whether as part of a renovation project or a new window installation. The durability of the aluminum profiles is particularly remarkable: they resist UV rays, moisture, and warping without degrading over time.

The PVC and hybrid lines are also engineered to last, without deformation.

Isothermic is a Canadian family-owned business that manufactures its products in a 216,000-square-foot facility, with 8 patents pending—a testament to their commitment to quality and continuous innovation in durable window manufacturing across Canada.