ENERGY STAR® certification for fenestration products
Know your zone
For ENERGY STAR, Canada is divided into three climate zones (1, 2, and 3).
Zone 1 is the warmest and 3 is the coldest.
Climate zone map of Canada for ENERGY STAR certification
Map of Canada's climate zones - text version
Zone 1: in light green; south-western B.C. and Vancouver Island.
Zone 2: in dark green; southeastern, central and northern B.C. except the extreme northern part; southern and central Alberta; southern Saskatchewan and extreme southern Manitoba; the extreme southern part of northwestern Ontario; central and southern Ontario; south-western Quebec; all of the Maritimes and Newfoundland except for the northern part of the Northern Peninsula.
Zone 3: in light blue; the extreme northern part of B.C. and northern Alberta; central and northern Saskatchewan; all of Manitoba except the extreme southern part; northern Ontario except the extreme southern part of northwestern Ontario; all of Quebec except the south-west; the northern part of the Northern Peninsula; all of Labrador, Nunavut, N.W.T., and the Yukon.
Zone 3: >= 6000 HDDs
Zone 2: >= 3500 to < 6000 HDDs
Zone 1: < 3500 HDDs
Note: The climate zones are based on an average annual temperature indicator called a heating-degree day (HDD). An HDD is the annual sum of the degrees of the average daily temperature for all days below 18 °C. The higher the HDD value, the colder the location. The heating degree day values used for ENERGY STAR are from the Canadian Model National Building Code (2010).
Why it’s important
Consumers should know their climate zone and ask for products that are certified for it.
The climate zone for which a window, door or skylight is certified ENERGY STAR will be shown on a label on the product and in sales literature.
Many windows, doors and skylights are certified for more than one zone. You may save even more on energy costs by buying a product certified for a colder zone than where you live.
However, if you buy a window rated for a zone that is warmer than the zone you live in, you may discover that the window does not insulate as well as you expect.
If you live at a significantly higher elevation than the surrounding area, look for a product rated for a zone at least one level colder. This applies especially to areas in southern and central British Columbia where energy efficiency levels are based on major urban centres located in valleys.
Ask your home builder, renovator or retailer to ensure the products you buy are ENERGY STAR certified for the zone you specify or colder. Check the label to be sure.
The ENERGY STAR name and symbol are administered and promoted in Canada by Natural Resources Canada and are registered in Canada by the United States Environmental Protection Agency
- Date Modified: