We had 13 Great Lakes vinyl windows installed in 1999. This year they all began to fog up. If I put my hand on the window, I can feel the heat/cold on the inside pane. At first they also filtered out noise. Now we are hearing a lot of noise. Because there is no moisture between the panes, they claim they are not defective. We assumed that the gas had just seeped out. Now they have informed us that the windows sold in 1999 did not contain argon gas. Does anyone know if this is true? Since the company that sold and installed them no longer uses their windows, are we just up a creek?