When a window is physically and visibly broken, especially the frame, it's obvious to anyone it needs to be replaced. There are other more subtle reasons for replacing a window which often means the window is broken in a way which isn't clearly obvious. When the windows don't open and close smoothly, don't lock, or have a draft in the winter and allow warm air inside during the summer, they are structurally compromised. Other reasons to replace windows may be to upgrade to modern window features, change window styles, or simply for cosmetics if the old ones appear worn out.
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