Energy Efficient Products

Saving homeowners money on energy bills.

​Windsor Windows & Doors understands the importance of designing the most energy efficient products possible. Energy efficient products help save you money in heating and cooling costs, but they also reduce environmental impact by offsetting the energy used in production.

Insulated Glass

Low-E glass is standard in all products manufactured by Windsor. This energy efficient glass ensures year-round savings and comfort by optimizing the sun’s heat and a home’s heating and cooling systems. In the summer, Low-E keeps a home cool and comfortable by rejecting the sun’s heat and damaging rays. In the winter, Low-E glass helps a home stay warm by reflecting heat back into the rooms.

Energy Star Logo


Windsor’s products meet ENERGY STAR ratings, adhering to the strict energy efficiency guidelines set by the Environmental Protection Agency (EPA) and the U.S. Department of Energy. Qualifying windows have two or more panes of glass, warm-edge spacers between the panes, improved framing materials and Low-E coatings.

NFRC Certified

Windsor’s products are NFRC rated. The National Fenestration Rating Council is a third-party certification agency, which developed and operates a uniform national rating system for the energy performance of fenestration products.

Superior Energy Efficiency

Windsor’s products have earned the Gas Fill Certification from the Insulated Glass Certification Council (IGCC). Certification is only awarded to products that average a 90% argon fill between the panes of glass, ensuring superior energy efficiency.