EPA Releases Latest Info on Most Efficient Program for Windows

October 23rd, 2012 | Category: Industry News

The U.S. Environmental Protection Agency (EPA) released draft 2 of the Proposed Eligibility for Recognition of Residential Windows for stakeholder review and comment. The draft pertains to ENERGY STAR’s Most Efficient 2013 eligibility for recognition of residential windows. This latest specification was developed with consideration to the comments received in response to the ENERGY STAR Proposed Eligibility for Recognition of Residential Windows released in September 2012.

Changes include removal of the Visible Transmittance (VT) minimum for all zones. “Stakeholders noted that there were better approaches to achieving EPA’s goals than setting a minimum VT criterion,” says the EPA. “Due to variations in National Fenestration Rating Council test sizes across operator types, whole-product VT does not provide a consistent basis of product comparison.”

The latest draft also adds a solar heat gain coefficient (SHGC) minimum of 0.20 in the Northern Zone, a decision to which “stakeholders generally supported,” says the EPA. The minimum SHGC selected for the Northern Zone aligns with the minimum SHGC proposed for the Canadian Most Efficient program for windows.

The EPA also reduced the maximum SHGC levels in the Southern and South-Central Zones. Stakeholders suggested that EPA change the maximum SHGC levels in the Southern and South-Central Zones to match the Draft 1 Version 6.0 specification and the 2012 International Energy Conservation Code (IECC).

Stakeholders may send comments to this latest revision to windows@energystar.gov. Comments must be received by Monday, October 29, 2012.

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