Weatherproofing old windows
I live in a 100 year old school house. The west side of the house has 10 - 3 ft x 8 ft tall single pane original windows. During the winter you can feel the cold air coming in. My wife won't let me put storm windows on due to their appearance and she won't let me replace the windows either. These are sash windows but we do not open them ever. They have been caulked around the edges but they still leak air especially during strong winter storms.
I would like to add plexiglass sheeting to the outside frame during the winter months to cut down on the wind intrusion into the house. We are situated on a hill overlooking a field so the wind hits the house hard during a storm. Does anyone have any experience with this? What thickness would be required? Is this an efficient weatherproofing method or does someone have a better suggestion.
Thanks for the help.