I am remodeling a family room in our house. Last year we remodeled a bathroom and replaced a window with a vinyl window. I am not happy with the window it is letting in more cold air than the wood pella window which is 43 years old. I have checked out the pella replacement window,which is wood inside aluminum outside.I like the thought of a maintenance free window but I would like to think I have helped to save utility bills. I would like yo know if there is a difference between the vinyl windows which is rated the best. Thank You