The U.S. Environmental Protection Agency (EPA) has released Draft 1 of the ENERGY STAR for Windows, Doors, and Skylights Version 6.0 specification and the ENERGY STAR for Windows, Doors, and Skylights version 6.0 Draft 1 Criteria and Analysis Report for stakeholder review. Both documents are available to view online.

According to the EPA, this draft specification was developed with consideration to the comments received in response to the Version 6.0 Product Specification Framework Document released in October 2011.

In addition to providing definitions for products, performance metrics, etc., the draft’s scope clarifies that the program covers residential doors, windows and skylights. Excluded products are those assembled onsite, such as sash packs or sash kits; doors, windows or skylights intended for installation in non-residential buildings, as well as doors, windows or skylight attachments that are not included in a product’s NFRC-certified rating.

According to the draft, “to qualify for ENERGY STAR, products shall have NFRC-certified U-factor and, where applicable, Solar Heat Gain Co-Efficient (SHGC) ratings at levels which meet or exceed the minimum qualification criteria specified. Windows and skylights shall meet the criteria for a given ENERGY STAR climate zone. Doors shall meet the criteria for a given glazing level. Dynamic glazing products shall meet the criteria while in the minimum tinted state for chromogenic glazing products or the ‘fully open’ position for internal shading systems.”

For example, under the new criteria, windows in the northern climate zone must have a U-factor of ≤ 0.27; any SHGC is acceptable. In the north-central zone U-factors must be ≤ 0.29 and SHGC ≤ 0.40, while in the south-central U-factors must be ≤ 0.31and SHGC ≤ 0.25. Windows in the southern region will require a U-factor of ≤ 0.40 and a SHGC of ≤ 0.25.

Air leakage requirements are also covered. According to the draft, “windows, sliding doors and skylights shall demonstrate adherence to this requirement by displaying ‘≤ 0.3’ in the air leakage portion of the NFRC temporary label. Swinging doors shall demonstrate adherence to this requirement by displaying ‘≤ 0.5’ in the air leakage portion of the NFRC temporary label. Manufacturers may test and/or add the necessary labeling as their products come up for NFRC re-certification.”

Written comments are due by Friday, September 28, 2012, and may be submitted to Stakeholders should include supporting data and documentation for all comments submitted, where relevant. With the exception of those labeled as confidential, stakeholder comments will be posted online.

EPA will be hosting an in-person stakeholder meeting and concurrent webinar on Monday, August 27, at 1310 L Street Northwest in Washington, D.C. To register for the in-person stakeholder meeting, send an e-mail to with “Stakeholder Meeting Registration” in the subject line and include your contact information in the body of the e-mail. Details on meeting times and registration for the webinar will be provided at a later date.

The ENERGY STAR Residential Windows, Doors, and Skylights specification is expected to take effect January 1, 2014.

Manufacturers can provide feedback on the draft by emailing


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