Windows bring light, warmth and beauty into homes, giving a feeling of openness and space to living areas, but they can also account for 10 to 25 percent of your heating or cooling bill. Given rising energy costs, it is important to understand what types of energy-saving options are available. Today, there are many window technologies available that are worth considering. Glazing materials now come with a wide selection of options such as Low e, Argon, and perhaps one of …