Natural Resources Canada (NRCan) 2025 recognition criteria for residential windows and sliding glass doors sold in Canada
Scope
The ENERGY STAR® program distinguishes the highest performers in energy efficiency for recognized products with the ENERGY STAR Most Efficient designation.
Windows and sliding glass doors that meet Version 5 of the ENERGY STAR technical specification for residential windows, doors and skylights sold in Canada are eligible.
A window is defined as an assembled unit consisting of a frame/sash component holding one or more pieces of glazing functioning to admit light and/or air into an enclosure and designed for a vertical installation in an external wall of a residential building. This definition also includes all transoms greater than 700 mm (27 in.) in height.
A sliding glass door is defined as a door that contains one or more manually operated panels that slide horizontally within a common frame.
ENERGY STAR Most Efficient Criteria
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
- A U-factor of 1.05 W/m2·K (0.18 Btu/h·ft.2·°F) or lower
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.
The ENERGY STAR Most Efficient logo will be available upon request to qualifying manufacturers and their dealers.
The ENERGY STAR Most Efficient 2025 designation may be used in association with window and sliding glass door products recognized during this period for as long as the model remains on the market. The Most Efficient logo must not be applied directly to the window or sliding glass door as a label.
For more information on ENERGY STAR Most Efficient, refer to the ENERGY STAR Canada Brand Book or contact ENERGY STAR Canada at energystar@nrcan-rncan.gc.ca.
The ENERGY STAR name and symbol are trademarks registered in Canada by the United States Environmental Protection Agency and are administered and promoted by Natural Resources Canada.