The windows of your home allow you to see what is going on around you, but they can also make your heating and cooling system work harder. A contractor who specializes in window replacement can replace your single-paned windows with double glazed windows to combat this problem.
Double glazed windows have two panes of glass that are separated by a pocket of air or gas. The whole apparatus is then sealed to prevent condensation between the panes. The glass is also coated with a special glaze that repels hot air and warms cold air. The gas between the panes is often an inert gas such as argon that, because of its higher density, provides better insulation than regular air.