I am replacing a bedroom window that has fogged. In a discussion with Winnebago today, I learned that the windows on new Winnie products are single pane glass and they no longer sell products with dual pane glass. I surely can understand why since so many windows have broken seals but wonder about the energy efficiency of a single pane of glass. How is Winnebago responding to this issue. Is the glass Low-E? It still seems the single pane glass would be less efficient. Has anyone heard Winnebago's pitch on their new windows?