If you are replacing your windows for reasons other than energy efficiency, buying energy efficient windows will be the best way to go in the long run, even with the added cost. However, if you’re only looking for ways to improve the energy efficiency of your home, replacing your windows may not be your best choice because it takes a long time to recoup the money you spend through savings on your utility bills.

Our online energy audit calculator will give you a better idea of what energy efficiency upgrades will be most cost effective for your home and how much money you’ll save. It will also let you know how you’re doing compared to others living in your city.

If you decide to go through with your window project, you should take advantage of the federal government’s Residential Energy Efficiency Tax Credit. This credit will cover up to 30 percent up to $1,500 of the cost of energy retrofits such as replacing your windows, installing insulation, air sealing and other upgrades. To qualify, purchase windows with a U factor of 0.3 or less and a SHGC of 0.3 or less.

Updated Aug. 10, 2010