I live in a 100 year old home with old windows. Storm windows work. Also, the panes are fairly easy to replace and if you want to put the money into it, I belie

I live in a 100 year old home with old windows. Storm windows work. Also, the panes are fairly easy to replace and if you want to put the money into it, I believe they make a double paned product you can replace the panes with. Despite the large initial investment, it's overall cheaper because you never need to replace. We've actually had a few panes broken, and it's dirt cheap since normal glass is cheap, and the pane replacement is a DIY-doable project (remove glaze, remove plane, place new pane, reglaze).