REPLACEMENT WINDOWS AND DOORS AJAX
Choose from a wide variety of energy efficient replacement windows to suit the unique requirements of your home. As one of the few window companies in Ajax that utilizes Cardinal Glass, you can expect some of the best replacement windows in Ajax in terms of energy efficiency and value.
Learn MoreSchedule your free in-home,
"*" indicates required fields
REPLACEMENT WINDOWS AND DOORS AJAX
Choose from a wide variety of energy efficient replacement windows to suit the unique requirements of your home. As one of the few window companies in Ajax that utilizes Cardinal Glass, you can expect some of the best replacement windows in Ajax in terms of energy efficiency and value.
Schedule your free in-home,
no-obligation quote today!
"*" indicates required fields
We’re proud to offer replacement doors and replacement windows for homes in Ajax.
All of our replacement window and doors in Ajax are energy efficient, visually appealing, and built to last. We work exclusively with highly-rated Cardinal glass to ensure first-rate products, and we plan every part of the windows and doors installation process, from initial consultation to final inspection. In order to easily fit your Windows and doors installation into your busy schedule, we often finish the windows installation process in just one day.
Between our high-quality products, excellent customer service, and vastly experienced window installers, you will never need to purchase new windows and doors for your Ajax home again.
Serving the Durham Region for Over 20 Years
Thermo-Bilt has been a recognized Durham windows and doors company for over two decades. Our window installers are not only knowledgeable and experienced, but also customer service-oriented and eager to please. We understand that improper door or window installation can lead to a host of problems, such as drafty windows, loss of energy-efficiency, leaks, condensation, and even cracks. That’s why Thermo-Bilt’s window installers take the time to ensure that every windows and doors replacement is done with the utmost care and attention.
At Thermo-Bilt, we strive for absolute satisfaction backed by a lifetime manufacturer warranty on window frames, insulated glass units, and hardware on all models.
We’re proud to offer replacement doors and replacement windows for homes in Ajax.
All of our replacement window and doors in Ajax are energy efficient, visually appealing, and built to last. We work exclusively with highly-rated Cardinal glass to ensure first-rate products, and we plan every part of the window installation process, from initial consultation to final inspection. We understand that everyone has busy schedules so we plan to fit your windows and doors installation in one day.
Between our high-quality windows and doors products, excellent customer service, and vastly experienced window installers, you will never need to purchase new windows and doors for your Ajax home again.
Serving the Durham Region for Over 20 Years
Thermo-Bilt has been a recognized Durham windows and doors company for over two decades. Our window installers are not only knowledgeable and experienced, but also customer service-oriented and eager to please. We understand that improper door or window installation can lead to a host of problems, such as drafty windows, loss of energy-efficiency, leaks, condensation, and even cracks. That’s why Thermo-Bilt’s window installers take the time to ensure that every windows and doors replacement is done with the utmost care and attention.
At Thermo-Bilt, we strive for absolute satisfaction backed by a lifetime manufacturer warranty on window frames, insulated glass units, and hardware on all models.
Many
See all Thermo-Bilt Windows in Ajax

Double Hung Windows
Our double hung windows are an excellent choice for rooms that face decks, porches and walkways.

Casement Windows
Our casement windows are reliable, practical, energy efficient and designed to keep harsh weather out.

Bay Windows
Our bay windows are decorative that curves outwards from the wall, allowing you amazing views.

Single Hung Windows
Our single hung windows are easy to clean and take up no additional space when open.
Thermo-Bilt Reviews
See all Thermo-Bilt Doors in Ajax

Steel Entry Doors
Our steel entry doors are rich with features that make them an excellent choice for your home.

Fiberglass Doors
Our fiberglass entry doors are a perfect compromise between aesthetics, durability, and safety for your home.

Sliding Patio Doors
Our sliding patio doors are an excellent way to save space in your cozy home.

Hinged Patio Doors
Our hinged patio doors swings outwards, opening up the inside of your house to your beautiful yard, garden, or patio.
Our Work
Our window company in Toronto has worked on thousands of homes. Take a look at the range of Toronto window installation jobs we’ve completed over the years.
FAQs
Are Energy-Efficient Windows and Doors a Good Investment?
Although the GreenON Ontario energy rebate program has unfortunately expired, energy-efficient windows are still a wise investment for your home. After a window installation for your Ajax home, you’ll start to see a drastic impact on heating, cooling, and other energy bills. By keeping the warmth or cool air emitting from your furnace and air conditioner, respectively, in your home, you’ll save a noticeable amount on HVAC costs.
A window replacement also adds curb appeal to your home, increasing its overall value. When the time comes to move, you should easily make back the amounts you invested in your Ajax home’s energy efficient windows and doors.
Why Choose Vinyl Windows?
Vinyl windows come with a long list of benefits. First of all, the life expectancy of vinyl windows far exceeds most other materials available on the market. Aside from being long-lasting, vinyl windows are also incredibly energy-efficient, consistently shaving off heating, cooling, and other HVAC costs in your Ajax home. Vinyl windows offer a lot of room for customization as well. This material can easily be painted to match the overall aesthetic of your home, and it will not fade in the sunlight even over long periods of exposure
What is the Cardinal Glass Difference?
All of Thermo-Bilt’s replacement windows and doors are built with state-of-the-art Cardinal Glass, an innovative glass manufacturer whose mission is to design and fabricate the most advanced residential glass products in the industry.
Cardinal Glass is engineered to deliver the perfect balance of solar control and visibility, while providing the highest levels of year-round comfort and energy savings. Cardinal Glass’ superior insulation works hard to keep cold air out in harsh Ajax winters, and hot air out in the summer months. All Cardinal Glass products are manufactured with a special manufacturer’s coating designed to be self-cleaning, using only the power of the sun’s natural UV rays to keep your windows cleaner, longer. Due to Cardinal Glass’ excellent insulating value, all products are also Energy Star® compliant, meaning you can rest easy knowing that your windows and doors are certified energy-efficient.