IESAndersen Windows has been making quality energy efficient windows for over 100 years. They are the industry leader in innovation and quality. Andersen believes windows and patio doors should be made of wood, but exterior facings should be protected from the elements. That's why they manufacture wood-clad windows and patio doors with vinyl exteriors. They offer beauty, luxury and natural appeal while maintaining high standards of weather resistance that lowers their maintenance requirements. The interior natural wood allows you to retain an attractive paint or stain finish indoors.