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| How to choose your windows | |
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| Where to find them? [PDF] | |
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ENERGY STAR qualified windows and patio doors
How to choose your windows
Install the right product in your home!
1. Choose an ENERGY STAR qualified window or patio door based on your climate zone.
There are four climate zones in Canada. Zone A is the mildest region and zone D, the coldest. A product that is ENERGY STAR qualified for the zone you live in meets strict energy-efficiency requirements for that zone. As a result, your product is guaranteed to offer superior energy-saving performance.
The more zones a product qualifies for, the more energy-efficient it is.
See "Listing of Québec cities according to climate zone".
2. Check the product label or manufacturer's literature to find out which climate zones your product is qualified for.
A window or patio door qualifies for one or more zones depending on its Energy Rating (ER) value, displayed on the product label or in the manufacturer's literature. The ER value is based on several factors, including a product's U value, potential solar heat gain coefficient and airtightness.
See sample ENERGY STAR label showing a product that is qualified for zones A, B and C.
3. Compare products as required using the ER scale.
The ER scale determines the Energy Rating value required for a product to qualify in any given zone. It can be used to compare the overall energy-saving performance of different ENERGY STAR qualified windows and patio doors. This scale ensures that even Canadians living in the colder areas of the country can base their choice on the most energy-efficient products available.
ER scale showing minimum ER values required per climate zone1 in Québec
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| Climate Zone | ER value (overall energy-saving performance) | |
| Most windows and patio doors | Picture windows | |
| B | 21 | 31 |
| C | 25 | 35 |
| D | 29 | 39 |
ABOUT NEGATIVE ER VALUES...
A negative ER value refers to an ENERGY STAR qualified product that has not been reviewed since the new CSA standards were adopted in 2004. Use the following formula to convert negative ER values: Negative ER value (pre-2004) + 33 = Approximate current ER value.
4. Get more technical information on your product, as required:
For more information on the energy efficiency of a particular window or patio door, consult the Qualified Products section of the Canadian ENERGY STAR site.
