I must share how dissatisfied I am with their vinyl windows. I purchased sliding basement windows. They have two about 1″ weep holes that allow cold air to stream through–so much so that the glass above the hole is covered with condensation. I had to cram towels in the tracks to prevent air flow into the house. When I called their corporate office, because their product service department could only provide me air permeable sticky-backed, cheap plastic flaps to tack on the outside of the window, they said the window was supposed to be designed like that and that the window meets their tested energy standard. If that is the case, I suggest that people look for other brands because the air flows through, which does not seem to be a very energy efficient design. Plus the cheap flaps were only made because people were complaining about bugs crawling though the holes-something to look forward to in spring.