There is no one-size-fits-all answer to the best window material, as the ideal material varies based on the homeowner’s needs, preferences, and budget. However, fiberglass windows are a very popular option among homeowners. Fiberglass windows are incredibly strong and durable, with a lifespan of up to 50 years. They are resistant to warping, cracking, and rotting, making them an excellent choice for areas with extreme weather conditions. Also, fiberglass is an excellent insulator, helping to keep your home cool in the summer and warm in the winter. Fiberglass windows provide high levels of thermal insulation, reducing energy consumption and lowering energy bills.