What ENERGY STAR certification means
ENERGY STAR states that certified residential windows are independently tested, certified and verified through NFRC procedures and must meet EPA energy-efficiency criteria for the applicable climate zone.
- ✓Start with your ENERGY STAR climate zone
- ✓Check the NFRC U-Factor and SHGC
- ✓Match glass performance to orientation and climate
- ✓Do not assume a frame material alone guarantees efficiency
Savings need context
ENERGY STAR says replacing single-pane windows with certified products can lower household energy bills by an average of up to 13% nationwide in its stated comparison context. Actual savings depend on the home, climate, existing windows and installation quality.
Use the numbers
Turn benchmarks into a project range
Change window count, frame material, style and location in the estimator. It returns a planning range and shows the assumptions instead of hiding them.
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