Based on consumer and business reviews, financial metrics, production volume and company size, the best replacement windows are those made by Andersen Corporation, Marvin, Jeld-Wen, Atrium and MI Windows and Doors. Based on the type of replacement window, the top five types are wood, clad-wood, vinyl, fiberglass and aluminum.
Through its subsidiary Renewal by Andersen, Andersen Corporation is the number one company for replacement windows, having received the "Highest in Customer Satisfaction for Windows and Doors" in 2015 from marketing firm J.D. Power and Associates. Marvin is a company known for its ability to replicate architectural styles, highly energy-efficient windows and custom solutions. Jeld-Wen is on the Forbes list of the 100 largest privately-owned companies in the United States. Atrium specializes in vinyl and aluminum windows and makes about seven million windows a year, with total sales of about $800 million. MI Windows and Doors specializes in vinyl, composite and aluminum solutions.
Wood replacement windows provide good insulation, are versatile and can be milled to shape, stained or painted to match a home's exterior. However, wood requires more maintenance because it is vulnerable to moisture. Clad-wood windows offer the aesthetic appeal of wood on the inside but not on the exterior, where a thin layer of vinyl or aluminum protects the wood. Color choices for the exterior may be limited and vinyl cannot be painted.
Vinyl replacement windows are economical, good insulators and easy to maintain. However, they are sensitive to temperature extremes and are prone to warp and leak over time. Fiberglass windows have similar advantages to vinyl windows plus the durability and stability to temperature extremes, but choices may be limited. Aluminum is strong, relatively inexpensive and easy to maintain; however, it is a poor insulator and may form condensation in the interior in cold climates.