Looking for energy-efficient windows?

In Canada, windows display the ENERGY STAR® symbol if the model qualifies as high efficiency.

Detailed information for manufacturers/dealers

Window technology and energy efficiency

Today’s windows are better designed and more insulating than products manufactured 25 years ago. New technologies such as foam-filled vinyl or fibreglass frames and sashes, low emissivity (low-e) glass, inert gas in sealed insulating glass units and improved hardware have made windows more airtight and much more efficient.

Windows fall into two main categories:

  • operable—windows that open in some way, either on hinges or by sliding
  • non-operable (also called fixed)—those that do not open

When it comes to energy efficiency, non-operable windows are the most airtight. However, most homeowners prefer to have some way to open a window, not just as a source of fresh air, but also as a means to escape in case of emergency.

Among operable windows, hinged windows (awning, casement, hopper or tilt and turn models) are typically the most airtight because the closing mechanism helps pull the window tight against the frame.

Buy ENERGY STAR for high efficiency

Energy Star logo

Make shopping easy: look for the ENERGY STAR symbol.

Products that are certified for the zone in which you live—or colder—are the best energy performers of all makes and models on the mainstream market. They meet strict technical specifications for high efficiency—without compromising features or performance in other areas.

Every year some product models earn the designation ENERGY STAR Most Efficient. These are the best of the best. They rank at the very top of certified models for that year. See the list of windows named ENERGY STAR Most Efficient 2016. [zip - 1.2 MB]


ENERGY STAR certified windows are certified by an independent accredited agency for energy performance and insulating glass durability. These certified products often have longer warranties than conventional products.

Compare current models of all ENERGY STAR certified windows using our searchable product list.

More tools you can use

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