Energy efficient glazing
An average home looses 10% of its heat through windows and doors. Good, energy efficient glazing reduces this heat loss, keeps the home warmer and reduces heating bills. It can also make the home quieter.
Double-glazed windows have two sheets of glass with a gap between them which is usually 16mm wide. It is this gap which creates an insulating barrier to slow down the rate at which heat escapes from the home. Triple-glazed windows are now also available which have three sheets of glass, and therefore two insulating gaps, to provide even better insulation.
The typical lifetime of double glazing is around 20 years. Over time, the gas within the panes will gradually evaporate at an estimated rate of 0.5-1% per year. When around 25% of the gas has evaporated, the thermal performance of the windows will be reduced and replacing the windows or installing a secondary glazing measure should be considered (see our factsheet ‘Secondary glazing: the low cost alternative to double glazing’).
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