Thermal Sash Window and Door Systems Inc.

Jun 2026

We just replaced 24 windows in our house. Working with Rob O'Connor was an absolute joy. We had priced out windows from all the major manufacturers and distributors and by far Thermal Sash was the most competitive. Take it one step further, their product, Okna Windows, after exhaustive research also turn out to be on the high end of quality as well. The installation was a breeze and far exceeded my expectations of quality work. Thermal Sash came as a referral from a neighbor, and I would absolutely refer them to anyone else.

Apr 2026

Thermal Sash/Think Windows replaced a large window for us many years ago and we were finally able to move forward with the remaining windows. We were very happy with our first window so we felt confident that this company would be the right choice again! And we were right! Our new windows are superb and we couldn’t be happier! The craftsmanship is excellent! The workers were conscientious and pleasant to have around. No more drafty windows. Every window was done with quality workmanship and the cost was very reasonable! We highly recommend this company for your new windows!

Apr 2024

We had Thermal Sash replace 20+ windows and patio slider in our home. We are very happy with the product and the installation. The pricing was excellent compared to other contractors. John took the time to show us several samples, review & explain each one so we knew what we were getting. The installers did a fantastic job, courteous & professional.