Energy Efficiency Ratings: Details
Windows (Select a New Product)
Products are eligible for ENERGY STAR® based on their U-factor (the lower the number, the more energy efficient the product) or their Energy Rating (ER - the higher the number, the more energy efficient the product).
To find models that are the most efficient, select the ENERGY STAR Most Efficient checkbox in the “Energy Efficiency Criteria” section below.
Download ALL the ENERGY STAR Most Efficient models. (ZIP Format)