The U.S. Environmental Protection Agency announced the final criteria for its Energy Star Most Efficient 2024 program, including new windows and sliding glass doors specifications.

The U.S. Environmental Protection Agency announced the final criteria for its Energy Star Most Efficient 2024 program, including new windows and sliding glass doors specifications.

Changes are set to take effect for solar heat gain coefficient (SHGC) requirements in the South-Central zone and the U-factor and SHGC requirements of the Southern zone. Criteria for skylights will remain unchanged. While the current (2023) criteria call for SHGC ratings of less than or equal to 0.25 in the South-Central zone, the new criteria now call for equal to or less than 0.23.

The current criteria calls for a U-factor rating of less than or equal to 0.20 in the Southern zone and SHGC ratings of less than or equal to 0.23. For 2024, two combinations are allowed: a U-factor of less than or equal to 0.21, an SHGC of less than or equal to 0.23, a U-factor equal to 0.22, and an SHGC less than or equal to 0.21.

The agency is also removing requirements for North American Fenestration Standard/Specification Performance Grades equal to or greater than 15 for doors, windows and skylights to help simplify criteria.

Officials said the program will only highlight products currently available for sale in the U.S. while reminding partners that keeping product availability information with certification bodies current is critical. Partners must provide all information called for by the recognition criteria to their certification body at the time of certification in order to be recognized by the program.

“While it is our intention to begin automatically nominating window products for Most Efficient recognition in 2024, until that time, partners will need to apply for recognition for all products new to Energy Star Most Efficient in order for the agency to verify that a product meets the recognition criteria,” said officials.

Certified products meeting the new requirements will be highlighted as Energy Star Most Efficient for 2024 beginning Jan. 1, 2024.

1 Comment

  1. The new ratings will drastically affect most of the zones throughout the US. The U factor requirement is so low that only the northern zone will meet the approved qualifications. There are several glass products that meet the SHGC southern central and southern zones but none meet the U factors. That means no homeowner from north central to southern will qualify for the tax credits.

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