Condensation on windows and doors occurs due to the difference in temperatures on different sides of the glass, which is most prevalent during high indoor or outdoor humidity as well as extremely cold temperatures. The accumulated moisture then turns to liquid, usually in the corners of the glass, preventing light from fully infiltrating the room, and can also potentially damage the walls, window coverings or furniture surrounding the window. Energy efficient windows help in preventing condensation build up by preventing heat loss and therefore controlling for the temperature inside the glass panes, which can dramatically decrease your heating bills by avoiding water and air penetration, and the harmful condensation effects on your home interior.