Few people think about replacing their windows. Unless a window breaks, most people are content with their windows as they come. This is because window installation is expensive; replacing one window can cost upwards of $1,000. While this is a major expense, a silver lining is that new windows can improve energy efficiency in your home.
There are 2 key elements of any window: the frames and the panes. Frames hold the window panes in place. They can be made of a variety of materials, but the most popular at the moment is vinyl. New construction vinyl is low maintenance, affordable, moisture resistant, and non-conductive of heat. This makes it a cost effective way to upgrade the building’s energy efficiency.
Panes are almost universally made of glass, so the material isn’t what you’re choosing between. Instead, you would be choosing how many panes to install on a single window. Windows with 2 panes or more are significantly more energy efficient than single pane windows. This is because the space between the panes slows heat and sound transfer. Adding certain gasses to fill the space between panes can insulate the window area even more. Window replacement can be a blessing.
Source: WindowNation.com