We had about 25 new replacement windows installed about five months ago. They are the vinyl wrapped, double hung, low E glass, argon gas filled and flip out for easy cleaning. We are having two problems. First they won't stay up when we open them and second they collect moisture on the outside. The contractor has been out twice to adjust them. The last visit he said that's it; no more adjustment. They did stay open at that time. The weather finally cooled around here so we opened them last night and guess what, they wouldn't stay up! When we wake up in the morning we find that several of the windows have sweated so much you can't see through them. They seem to be behaving as if the gas between the panes doesn't exist. "Thermal pane" windows should not sweat, right? I assume this because the original oak framed double hung windows didn't sweat for about seven years (warranty was five years). Does anyone have experience with replacement windows? BTW the brand is Gorell. Am I expecting two much?