Have you ever noticed moisture in between the panes of glass in the double-paned windows in your home? Or do you have a white cloudy buildup in a window that makes it difficult to see through? If you have seen either of these phenomena in you home, then your thermopane window has failed. In a lot of homes, if I see one failed window, I will see several. This is often because the windows are of low quality or they were improperly installed which makes failure much more likely.
One of the more common and serious problems that I see over and over again is water penetration into the home. What makes this problem so serious is that if it is left uncorrected, the water can cause serious damage to the home.