For that matter, it's not hard to learn to cut entirely new panes for old-school windows, and the tools aren't particularly expensive. Break a modern window and

For that matter, it's not hard to learn to cut entirely new panes for old-school windows, and the tools aren't particularly expensive. Break a modern window and you'll most likely be replacing the whole thing, frame, casing(!), and all—the entire old window becomes trash. ... however, I do prefer the modern ones, myself. Energy loss through single-pane windows is no joke.