The U.S. Environmental Protection Agency (EPA) has released Draft 2 of the Energy Star for Windows, Doors, and Skylights Version 6.0 specification and once again encourages industry feedback. Written comments should be submitted to EPA at no later than Friday, February 8, 2013.

In a letter sent to stakeholders today, EPA says it appreciates the comments provided by stakeholders on the Draft 1 specification and the Draft 1 Criteria and Analysis Report. “While the thermal performance criteria proposed in Draft 2 are largely unchanged from Draft 1, EPA has made several revisions based on stakeholder comments.”

Key changes found in Draft 2 include:

  • EPA revised the door glazing level definitions to match those found in the National Fenestration Rating Council (NFRC) 100-2010.
  • EPA changed the U-factor for ≤ ½-lite doors from ≤ 0.23 to ≤ 0.25.
  • The full-lite SHGC criteria are now based on climate zones:
  • Northern and North-Central Zones require an SHGC ≤ 0.40
  • Southern and South-Central Zones require an SHGC ≤ 0.25

Equivalent Energy Performance criteria in the Northern Zone now include three trade-offs:

  • U-factor = 0.28; SHGC ≥ 0.32 (proposed in draft 1)
  • U-factor = 0.29; SHGC ≥ 0.37 (new)
  • U-factor = 0.30; SHGC ≥ 0.42 (new)

EPA also made revisions to the installation instructions requirement, primarily to clarify purpose. It also clarified the language on the Test Method Reference provided for Air Leakage in Table 6 of the specification.

In EPA’s response to comments from the first draft, the agency says it will not be extending the implementation date of the new requirements. Multiple stakeholders want the implementation date to be extended to January 1, 2015, according to the EPA. The agency says it has already pushed back the estimated implementation date for the Version 6 criteria and “does not anticipate any further delays.”

“The current Energy Star specification does not meet the 2012 IECC fenestration specifications in some climate zones, so delaying the Energy Star implementation date would cause Energy Star to become irrelevant in large parts of the country as more states adopt IECC 2012,” writes the EPA.

The tentative schedule is as follows: Comments due February 8, 2013; review comments and finalize criteria in February and March; publish new requirements in April; and the criteria will take effect January 1, 2014.

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