New 2010 ENERGY STAR Criteria

Effective January 4, 2010, new ENERGY STAR® performance criteria will be implemented for windows and patio doors. In many instances, the new ENERGY STAR performance criteria will increase performance requirements across all four (4) U.S. ENERGY STAR climate zones.

*Northern zone windows can meet prescriptive (1st row)
or alternative energy performance (2nd & 3rd row) criteria
to qualify for Energy Star.

New Energy Star Climate Zone Map