ENERGY STAR Most efficient critera for windows and sliding glass doors, 2025

In order to meet the ENERGY STAR Most Efficient criteria, windows and sliding glass doors must:

• • be manufactured by an ENERGY STAR Canada Participant
  • be sold in Canada, registered with NRCan as ENERGY STAR certified and posted on the Canada/NRCan website
  • meet the labelling section of the Requirements for the labelling and promotion of ENERGY STAR certified fenestration products sold in Canada
  • meet the following specific criteria:
    • A U-factor of 1.05 W/m2·K (0.18 Btu/h·ft.2·°F) or lower
      OR
    • An Energy Rating (ER) of 40 (unitless) or higher

ENERGY STAR Most Efficient Recognition
The ENERGY STAR Most Efficient 2025 designation will be effective from January 1st to December 31st, 2025. ENERGY STAR Most Efficient models will be made available on the NRCan website through the Searchable products list for ENERGY STAR certified windows or sliding glass doors.