The U.S. Environmental Protection Agency (EPA) announced today the final recognition

criteria for ENERGY STAR Most Efficient 2013 for 11 product categories, including windows. Regarding windows, savings vary by climate, house construction and number and type of windows replaced, according to the EPA.

EPA says it received limited comments on the proposed criteria distributed on September 14, 2012, with the majority related to windows. In general, commenters were supportive of the 2013 proposals.

In response to these comments and further analysis, the final criteria for windows reflect the following changes, according to the EPA:

• Removal of the Visible Transmittance (VT) minimum for all zones as this criterion did not provide a consistent basis for comparison;

• Addition of a Solar Heat Gain Coefficient (SHGC) minimum of 0.20 in the Northern Zone, as an alternative to VT criterion. This criterion aligns with the Natural Resources Canada ENERGY STAR Most Efficient 2013 program for windows;

• Reduction of the maximum SHGC levels in the Southern and South-Central Zones to 0.25 to harmonize with the 2012 International Energy Conservation Code (IECC) and the Draft 1 Version 6.0 ENERGY STAR Windows, Doors, and Skylights specification; and

• Clarification of the certification requirements for North America Fenestration Standard/Specification (NAFS) to ensure all certification bodies meet the same Standards.

Doors, skylights, tubular daylighting devices and dynamic window products are not eligible for recognition in 2013 but may be considered in the future.

ENERGY STAR certified products meeting these requirements will be highlighted as ENERGY STAR Most Efficient for 2013 at: beginning January 1, 2013.

For window products, partners will need to apply for recognition in order for the Agency to verify that a product meets the recognition criteria outlined above. At a minimum, partners will need to submit the product’s National Fenestration Rating Council Certified Products Directory Number, evidence of NAFS certification, and test reports indicating a performance grade of 15 or better.

Detailed application instructions will be provided shortly, according to the EPA.


For HVAC and window products, once EPA has confirmed product eligibility for recognition, the

ENERGY STAR Most Efficient 2013 designation will be provided along with usage guidelines.


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