Window Energy Ratings (Energy-Efficient Glass)

Window Energy

Window Energy Ratings

Window Energy Ratings tell you how energy-efficient your windows are. The rating system is based on a scale of A-G, with A-rated windows being the most energy-efficient. The scheme is similar to the energy ratings you will find on household appliances, white goods and light bulbs.
Considering the fact that up to 25% of the heat within most homes escapes through the windows, it’s easy to see why more and more people are opting for A-rated windows by installing energy-efficient glass into their existing window frames.

One of the most well-known energy-efficient glass products is Pilkington Energy Advantage™. This is North America's low-emissivity glass and it is specifically designed to prevent heat from escaping through your windows, reflecting heat back into your home. Using Pilkington low-e 4th surface technology, you can reduce the center-of-glass U-Factor by 21%, compared to a unit with a pyrolytic low-e and a clear lite.