Today's windows are twice as efficient as the average window manufactured a decade ago. If you are considering replacing your windows, make sure you are getting the most efficient windows you can, they'll provide years of energy cost savings and increased comfort in all seasons.
North Star windows are Energy Star approved and rated, which means they have been tested and evaluated using a strict common procedure that measures solar heat gain, heat loss through frames, spacer and glass and air leakage heat loss to come up with an overall product performance rating.
Our Energy Star rated North Star windows are among the most energy efficient windows on the market. Have a look at our energy ratings, compare glass and window types and use the handy Cardinal Glass calculator to find a perfect Ottawa climate solution.