Something to keep in mind: In Colorado, as you well know, we are at a higher altitude then most of the country. Due to this fact, windows that are manufactured out of state, tend to work poorly once shipped and installed. Have you ever driven up a mountain pass with a bag of chips, to find that the bag inflates and sometimes even pops, the higher you go? A similar issue happens with windows, when the gas between the panes expands due to a lower ambient pressure and can cause the windows to fail, often resulting in condensation buildup between the panes. All windows that we install, are manufactured locally by long lasting, reputable companies and are installed by our professional craftsmen to insure a proper fit and long life.