Newly installed high-performance windows should come with a label from one of the following certification bodies:

  • Canadian Standards Association (CSA)
  • Intertek Canada (Intertek)
  • Labtest Certification (LC)
  • QAI Laboratories (QAI)
  • National Fenestration Ratings Council (NFRC)

Your label highlights important performance features of the window including:

  • Its certified performance ratings (U-factor, Solar Heat Gain Coefficient, Energy Rating, and Visual Transmittance)
  • The climate zone(s) for which it is certified
  • A description of the product (type, materials, glazing, etc.)
  • Its certification information

For more information about window labels, visit Natural Resources Canada.

*Windows with a U-factor greater than 1.22 W/m²-K will not have an ENERGY STAR® rating on the label.

Did you see a building science or energy efficiency term you did not understand? Check out our glossary.