Do your windows seem to be fogged up, hazy, or have moisture in them that makes it impossible to get them clean? This is called seal failure.
You don't have to replace the whole window. You can have just your glass replaced, which costs less than replacing the whole window. Using us here at Eddie's Glass & Mirror Service, you will receive a 10-year warranty for seal failure for all the windows we replace the glass in (thermopane units.