Energy efficiency should be considered as an important factor in purchasing windows and doors. Energy efficient products are durable and perform well in different climatic conditions. They also come in a variety of designs to suit the aesthetic detail of different types of homes.CharacteristicsTypically, doors that are made of fiberglass, steel, and wood material rank high on the energy efficient list. Steel doors are infused with a core made of polyurethane for better insulating performance. Doors that are equipped with a magnetic strip in the frame are effective in sealing and preventing air leakage.Energy efficient windows are typically made of the same materials used in manufacturing doors but with the addition of vinyl, composite, and combination materials. Vinyl and fiberglass window