Restoring steel casement windows
I have steel casement windows, love the look.  House is unquie and beautiful.  However in the NY winter they are a problem.  I got a product that made a huge difference called a Indow.  Expensive, but it’s a custom fit for each window frame of hard plastic w foam edge around.  Creating a second barrier to single pane glass.  Made a big difference...I’m slowly getting to more windows in house.  For the ones I don’t have yet, and very big windows I use the 3M plastic sheet shrink wrap.... it’s time consuming but works.  If you can recommend a weather strip I would add that