Double-glazed windows have two sheets of glass with a gap in between, usually about 16mm, to create an insulating barrier that keeps heat in. This is sometimes filled with gas. Triple-glazed windows have three sheets of glass, but aren’t always better than double-glazed windows. To choose the most energy-efficient window look for the BFRC rating.
Energy-efficient windows come in a range of frame materials and styles. Performance criteria vary according to the following:
The data we use to work out energy and water costs come from a range of reliable international sources to give an average figure. Figures are rounded up or down to the nearest whole number.
* Total amounts potentially saved do not include lighting in individual rooms, or use of secondary heating.
EcoFrenzy has researched the market and to the best of our knowledge, figures and data are accurate at the time of publication.
EcoFrenzy is not responsible for any inaccuracies and will not engage in correspondence, but will update facts and figures when necessary or appropriate.