Signs it is time to replace
Windows usually tell you before they fail. A room that never holds its temperature, a draught you can feel with your hand near the frame, condensation between the panes, or a sash that sticks, rattles or will not stay up. Single pane glass and aluminium frames from the 1980s or earlier are working much harder than anything made today. None of these on their own mean you have to replace anything, but together they usually mean the windows are costing you more to live with than they look like they are.

