Factory-built glass block windows are eligible for the ENERGY STAR, but most glass block windows are built onsite. If you are purchasing glass block windows, look for the ENERGY STAR label to determine if the product is qualified. If the window is being assembled onsite using individual glass blocks, it is not eligible for the ENERGY STAR because it has not been tested and certified by the National Fenestration Rating Council (NFRC). All ENERGY STAR qualified windows, doors, and skylights must be tested and certified by NFRC.
The simple choice for energy efficiency.
energy efficient products
ENERGY STAR products are independently certified to save energy without sacrificing features or functionality. Saving energy helps prevent climate change. Look for the ENERGY STAR label to save money on your energy bills and help protect our environment.
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ENERGY SAVINGSat home
energy savings at home
Improving your home's energy efficiency with ENERGY STAR can help to lower high energy bills, improve comfort and reduce greenhouse gas emissions. Learn about the many ways to save in your home and track your progress with "My ENERGY STAR" - your new dashboard to savings.
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ENERGY EFFICIENTnew homes
energy efficient new homes
A new home that has earned the ENERGY STAR label has undergone a process of inspections, testing, and verification to meet strict requirements set by the US EPA. ENERGY STAR certified homes use 15-30% less energy than typical new homes while delivering better comfort, quality, and durability.
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ENERGY STRATEGIES FORbuildings & plants