A friend of mine recently asked me to look at his windows because he believed they needed to be replaced. He said that they had fogged up and looked terrible. I asked how old his home was and he said that it was built in the mid ’90’s. I haven’t seen the windows yet, but I can bet that his problem is not the window but the glass. Double pane windows have a life span of only 10 years; after than the gases between the panes dissipate and cause them to look foggy, cloudy, wet, or have crystals in them. Even if they have cross bars in them it is not too expensive to replace the glass and the process is rather simple for a trained professional.