windows@energystar.gov requirements in your specific climate area. ENERGY STAR criteria ENERGY STAR requirements for your area ENERGY STAR requirements of the homeowner’s region your climate region Energy Star website Energy Star: Windows Climate Search U-factor climate zone finder. ENERGY STAR requirements of the homeowner’s region ENERGY STAR requirements of the homeowner’s region Energy Star climate zone finder requirements in your specific climate area. climate zone finder Climate Zones Climate Zones ENERGY STAR requirements for your area ENERGY STAR requirements of the homeowner’s region Energy Star climate zone