Age of Pre-own?
You never say how old is your pre-owned home. I agree with finding the window installer through the permits dept. Find out how long ago was the install.
We recently enclosed our lanai and the installer has a 10-yr. warranty on the windows. But I will say that the warranty from the window manufacturer is invalid if the windows are installed improperly.
I suggest that you get a quote to fix the problem from a contractor, then approach the original installer and ask them to fix it. Also, usually, when the seal between a low-e, double pane fails, the deposit on the inside is metallic looking, not white. It has a rosette-like pattern (growing crystals?).
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