Using the "Canada Greener Homes" initiative, I used Windowtech's services to change 8 windows in my home. I met with 3 companies before choosing Windowtech. I chose Windowtech based on the quality of the windows, the personability of the sales rep (Dmytro), and the knowledge / years of experience of the company. The installation went smoothly and I am very happy with the windows. The customer service of everyone I interacted with was excellent - I received accurate and timely communication, everyone was helpful and responsive with my inquiries and requests, and resolved any issues in a timely and satisfactory manner. I would recommend Windowtech if you are looking to replace your windows.