Kolbe Windows and Doors, Marvin Windows and Doors, Polaris Technologies and Envirogreen Windows and Doors are good brands for energy efficient windows, according to Energy Star. Other highly efficient windows include Champion, Kohltech International and Mercer Industries.
Kolbe Windows and Doors manufactures a variety of double- and triple-pane windows that meet or surpass Energy Star guidelines. The company's most efficient products include the Teutonic fixed window and the Heritage Majesta double hung transom.
Marvin Windows and Doors offers a huge catalog of energy-efficient windows and doors, including the Integrity direct glaze polygon window and the Clad Ultimate double hung transom round top window. The company also helps customers select the glass type and other features best suited to their location and climate.