Windows and Doors
Your choice of windows and doors is vital in regards to energy efficiency. Windows and doors themselves as well as the area around them are common spaces where heat is lost and cold air is let in. Low-E, dual pane windows are best, and be sure to select something appropriate for your climate. ENERGY STAR, the same governmental body that certifies energy efficient home appliances, has the most up to date list of energy efficient window and door manufacturers and suppliers.
Energy Star
http://www.energystar.gov/
