The final draft of Energy Star v6 product specifications for qualified windows, doors and skylights is now available.
The chart below shows the energy efficiency requirements for windows:
Climate Zone U-Factor SHGC
Northern ≤ 0.27 Any
North-Central ≤ 0.30 ≤ 0.40
South-Central ≤ 0.30 ≤ 0.25
Southern ≤ 0.40 ≤ 0.25
Many in the industry have made contributions to shaping these new specifications that will go into effect Jan. 1, 2015. Written comments on the proposed final draft specification should be submitted to the EPA at email@example.com by Wednesday, Aug. 21, 2013. The EPA will post all comments to the Energy Star product development website, unless the submitter requests otherwise.