If you are in an older home, chances are your windows could stand an upgrade even without obvious signs of deterioration. That’s because they were not designed to be energy efficient originally. On lower quality, but newer windows, you’ll start to notice the signs of deterioration and failure from: Water leakage Air leakage Drafts throughout your home Hot spots and cold spots due to inefficient window assemblies Cracked panes, interior and exterior deterioration These are all signs that your windows may be in need of replacement; it’s never a good idea to delay, either – these conditions will not get better, or less expensive to address with time.