When double-pane glass needs replacing

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Q: I am sort of handy around the house and was wondering how difficult it is to remove and replace the windows in my house. There seems to be moisture between the double-pane windows now. Any tips? --Frank C. A: If you are seeing moisture between the panes of glass in a double-pane window, that indicates that the air-tight seal has failed, which is not unusual. What you want to do is replace the insulated glass unit, not the entire window -- the same as what would happen if you broke the window glass. Insulated glass units need to be special ordered to fit the window. Contact any licensed and bonded glass company in your area, and have them come out and measure and order the units for you. They can also discuss any options you have for installing glass that is more energy efficient. Installation involves snapping out the trim pieces that hold the glass in place, removing the old insulated glass unit, setting the new unit into the window frame with special tape to hold it in...