Be sure to choose the right product for where you live.
The energy rating (ER) helps you make an informed choice of windows or patio doors. It is based on a number of factors:
- Rate of heat transfer (U-value)
- Potential solar heat gain coefficient
- Airtightness
What is your climate zone?
For superior energy efficiency, you should:
- Determine your climate zone. Québec has three zones.
- Opt for an ENERGY STAR® qualified product with a high ER.
ENERGY STAR® is the international symbol of premium energy efficiency. Windows or patio
doors that display this symbol are among the most energy-efficient in their category.
Choosing these products also means:
- Up to 10% savings on heating costs
- A high degree of comfort, even in the coldest weather
- Less outdoor noise and condensation
- Airtightness improved by 20%–40%
For more information on ENERGY STAR qualified windows and patio doors.