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Marvin Intgrity Window Ice

For the last two winters, our house is two years old; we have had ice on several of our Marvin Integrity windows. The local service company has changed the seals on these windows several times but the problem still exists. The Marvin Integrity comments are:
“With regard to the ice, I don’t think that anyone can say that ice is ok – however, at the same time we cannot say that ice is the end result of a product defect either. There are so many factors that could contribute to the ice that in some cases ice buildup would be expected and in others it may not. As with all units with sliding sash (gliders, double hungs, etc.) there is a certain amount of air that will get around the sash – it is just the nature of sliding sash product. This air movement will be exaggerated if there is a positive or negative air pressure situation present and will also be impacted by humidity levels and temperature. The end result can be frost formation on certain portions of the window unit. Just as window units don’t manufacture condensation they also don’t manufacture ice – it is the end result of a number of conditions.”
Ice is formed when below freezing air is allowed to enter the house through air leaks in the window sealing. I have personally written to Integrity but they have chosen not to answer my letter. I am interested if any of your readers had had similar problems and what there was solution to the problem.

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