Dual Pane vs Single Pane Windows

Keep in mind that unlike your house, in an RV you sleep a very short distance away from a window. Dual pane is FAR more comfortable in cold weather. The humidity level in RVs is also much higher than your house and single pane will frost over quickly in freezing weather (and just sweat a lot in cold weather). Energy saving is a baseless argument, it's all about comfort. Once you experience the difference, you won't want single pane ever again. Dual pane is a must have for me although living out West where even in the summer it can get very chilly at night may cloud my opinion!