You’ve seen the ENERGY STAR label on almost every aisle of your local home improvement center, but do you understand what it means? Read on as the experts from Window and Siding Planet explain how ENERGY STAR affects you when it is time to buy new windows or doors.


Window and Siding Planet:  The ENERGY STAR program was developed in the early 1990s by the EPA to promote energy efficiency. Since its inception, the program has helped Americans save more than $362 billion in energy costs. The ENERGY STAR label is bestowed upon those products that help keep energy costs low.

Q: How does a product qualify for the ENERGY STAR label?

Window and Siding Planet: Bearing the bright blue label requires an investment on the part of the manufacturer. Specific to windows and doors, each must be well researched and adhere to strict EPA energy efficiency guidelines. Furthermore, each ENERGY STAR partner must provide evidence their product was certified by the National Fenestration Rating Council, a nonprofit that independently tests energy efficiency.

Q: What goes into an ENERGY STAR rating?

Window and Siding Planet: Each window and door is assigned a number in each of four categories: U-factor, Solar Heat Gain Coefficient, Visible Transmittance, and Air Leakage. These numbers illustrate the window’s performance in each area.

Q: Which windows have the best ENERGY STAR rating?

Window and Siding Planet: There are a number of framing materials and glass configurations that qualify for ENERGY STAR status. What works best will be different for each home, based on its location and other factors.

When you purchase windows and doors from Window and Siding Planet, you can rest easy knowing you have the most reliable products on the market. ENERGY STAR windows help you save money, ensure the comfort of your home, and protect against harmful UV rays.