I am so glad that I called Brock windows to replace a large old window at the back of our home. The sales person was very helpful and answered all my questions and even took the time to show me items on the old window that would be changed on the new. The new window has 3 panes and will be more efficient. Installation was great as the area was cleaned before the worker left. Price point was awesome. I highly recommend Brock Windows and will be ordering windows from them again.