Though a relatively costly upgrade, properly installed ENERGY STAR windows can significantly improve your home's energy efficiency, allowing the sun to help heat your home and retaining that heat during the winter.

Skill Level: Professional
Work with a contractor to choose ENERGY STAR® qualified windows for energy savings and improved comfort. If you currently aren't in a position to replace existing windows, you still can improve efficiency by sealing gaps, adding storm windows and using window coverings that hold in heat.
Cost Range: $150-$500 each + installation
Homeowners have access to a wide variety of style, quality, and efficiency levels.
Savings: $146-$501 a year when replacing single-pane windows
Upgrading the energy-efficiency of your windows can cut your annual energy costs, while also protecting your interior from fading and reducing condensation that damages sills.