PDF Guide to Energy
Guide to Energy-Efficient Windows Replacing your home's windows with ENERGY STAR® qualified windows will improve indoor comfort and filter out damaging ultraviolet light, while potentially saving you hundreds of dollars a year on heating and cooling costs.
Comprehensive guide to window energy efficiency. Learn about ratings, costs, savings, and how to choose the most energy-efficient windows for your home.
Most Energy Efficient Windows
Discover the most energy efficient windows for 2025. Expert-tested rankings, climate-specific recommendations, and detailed buying guide with ROI analysis.
Know how to buy energy-efficient windows with window ratings. Find out about window ratings certifications, ENERGY STAR® program, and more.
Window Buying Guide
EWC's window buying guide helps you step-by-step through the process and provides information on the energy-efficient ratings you need.
Modern energy-efficient windows have changed dramatically in the last decade, and understanding the ratings, types, and incentives available in 2026 can help you make a smarter investment that pays for itself over time.
PDF Consumer Guide to Energy
Upgrading to ENERGY STAR-qualifed models can save you as much as 7%-15% or more on annual household energy bills, depending on your geographic location and the type of window being replaced. Before replacing your windows , be sure you have already properly insulated and air sealed your home.
Energy-efficient windows can cut utility bills by up to 13%. Learn what to look for and how they save you money.
National Fenestration Rating Council
Shopping for Windows ? Find the best energy-efficient windows for your home in just a few clicks with our Window Selection Tool. This searchable database helps you compare different window types and options to find the ones that are right for your home and climate.
Claim federal tax credits for installing ENERGY STAR certified windows , doors or skylights or making certain other energy efficiency improvements to your home. Keep in mind that the cost of complete window replacement can vary.