When the wood around your windows are rotting on the inside or outside of your window.
The windows are drafty. Check for drafts by closing the window and holding a candle to it. If the light flickers, there’s probably a draft.
Caulk that is not sealed correctly.
The windows have warm or cool zones. On a hot or cold day, check for these zones by holding your hand over every inch of the window frame
The windows don’t open or close properly.
Your current windows require too much maintenance.
Whether they are drafty, leaky, or rotten, here are some signs that it is time to install new windows. If you have noticed one or more of these signs on the windows of your home, perhaps it is time to contact a window specialist.