Level 5 is always on the search for the best products on the market and hands down we chose Okna vinyl windows. We dismantled the window, tested the window in the real world, and compared their claims of an efficient window. And to be honest, we were thoroughly impressed with the strong build of the product, the detail they go through to be that efficient, and all of that with a fantastic looking end product. We knew that a window like this paired with our high efficiency installation process, it was something not seen in Illinois before.
OKNA manufactures premium vinyl window systems; they have re-invented the world of vinyl window systems. We love that their goal is to produce some of the finest high quality solid vinyl windows on the market. OKNA takes a European approach to building their window systems. They have a great deal of pride in their products and it shows.