Dual pane windows

How much weight is add with dual panes.
Thanks

they will add approx 300-500 lbs depending on the model

The weight is nothing compared to the benefits when you have dual pane windows. No they want save a lot on energy but the tinted window will reduce the sun light and it does help the cooling. Also it does help reduce the noise level. I have had both and the last 5th wheel had reflective window that weren't dual pane and there is a lot of difference. I said then I wouldn't own another 5th wheel without dual pane windows. The above is my opinion and is based on my experience of owning 3 5ers with dual pane windows and two without. GBY....