Door Factory installs Wintite. We had Wintite installed over our existing windows. The cost was a fraction of what window companies were quoting and has made a huge impact on the cost of heating and air conditioning. As an added bonus, our neighbourhood kids' school bus stop is right outside our living room and with the Wintite, we don't hear the kids in the morning any more since it helps with noise.
The installer was prompt, courteous and respectful of our home. We are so happy with our Door Factory experience, we've been telling all our friends!