There are some signs which are easy to spot when it comes to the need for a window replacement. If your windows are shaky or rattle with strong winds, it may mean that the frame no longer supports the panels and needs to be replaced all together. Difficulty in opening or closing can mean anything from deterioration to corrosion or rust, such a window has definitely had its run. Cold draughts leaking in from around the sills or sash, signify that your window maybe costing you more in lost energy, than they would to simply replace them! Peeling way or chipping paint is not only esthetically displeasing but can also facilitate mold and corrosion. Built up moisture, condensation and/or icing on the interior of a window pane, is usually a sign that the window is failing to ventilate or seal-out temperatures.