1. High Energy Bills
If your windows are not Energy Star rated, you could be greatly increasing your heating and cooling costs!
2. You Can Feel a Draft
Rooms with windows don't have to be draft. Energy efficient windows will keep your conditioned air indoors.
When warm, moist air contracts a cooler surface, such as a window glass that is letting in cold air, it cannot hold as much water vapor so it condenses onto the cool surface. This can also cause frost on the inside of the windows during the summer.
4. Hard to Open/Close
Windows can build up dirt, dust and debris over time, creating friction and making the windows difficult to close. Windows can also shift overtime making motion difficult, new windows glide open and close effortlessly.
5. Internal Seal Failure Visible
Moisture can get in between window panes and cause a discoloration of the window. This can be a sign of excess moisture, even if the discoloration is not wet!