In my 95 year old house I actually had to take some of the windows out (remove the stops) and sand the edges and then lubricate. It was a pain, but worth it. I have opened all but one window. It is so badly out of level I may never get it to work, but I'll keep trying. Replacement windows are out of the question for me. I love the old wooden windows with the old glass in them AND the old wooden storms. I am in the process of caulking and sealing to help with utility bills, but I'm in a very small house so it's not so bad. Good luck.