Interested in saving money? Interested in saving the earth's precious resources? Then you may be interested in installing energy efficient storm windows. Storm windows are a double-pane glass window that helps keep out the hot and cold temperatures from outside, and retain the indoor temperature without you needing to either crank up the air conditioner, or turn up the heat. Though storm windows may not have as many "benefits" as some of the newer windows available nowadays, they still do perhaps prevent the most heat loss out of all types of windows. So if you live in a cold area of the country, storm windows may be your best bet.