What Is ENERGY STAR?
ENERGY STAR identifies energy-efficient windows, doors, and skylights that meet climate-zone performance criteria. Products rely on independently certified NFRC ratings for U-factor and Solar Heat Gain Coefficient.
Why It Matters
ENERGY STAR is widely recognized by homeowners, contractors, utilities, and code officials. It can support rebate eligibility, tax-credit documentation, and product comparison workflows.
Details
Issuing BodyU.S. Environmental Protection Agency (EPA)
RegionUnited States
ValidityProduct-tied; requires retesting when product design changes