Never, I repeat, NEVER replace historic wooden windows with new vinyl "energy saving windows," that's a load of BULL! Get a good window restorer out to repair your windows, and add storm windows if you have none already. Here are some more helpful tips. Remember, wavy glass = (REALLY SUPER OLD NEARLY IRREPLACEABLE) antique glass. Virtually priceless.
Look at those windows on this historic home! These are called cathedral windows. We specialize in replacement windows and doors for historic homes in the Minneapolis St. Paul MN area. http://www.replacementwindowsmpls.com