Had casement and slider windows installed in the 90s. noticed right away that I was having condensation problems. Had to have them replaced for free (10 year warranty) a couple of times because condensation gets between the panes and the window isn't clear anymore (dirty looking); the warranty has expired now and i'm stuck with the condensation problem. called them up to ask about this but would have to pay again to get them replaced. would not recommend since these replacement windows need to be replaced; bad home improvement investment.
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