Menasha Replacement Windows, Siding and Doors Menasha, WI is located in Calumet and Winnebago counties and is south of Appleton. It’s also home to one of Feldco’s showrooms. Whether you need replacement windows, siding or doors, we’ll have the best of the best in the industry. Our products are all energy efficient, durable and beautiful. We make our windows, siding and doors with Menasha homeowners in mind. Combine that with expert installation and excellent service and you have Window and Door Magazine’s Dealer of the Year.