But energy-efficient glazing keeps your home warmer and quieter as well as reducing your energy bills.
That might mean double or triple glazing, secondary glazing.
A more comfortable home: energy-efficient glazing reduces heat loss through
windows and means fewer draughts and cold spots.
Peace and quiet: as well as keeping the heat in, energy efficient-windows insulate your home against outside noise.
Smaller energy bills: replacing all glazed windows
with A-rated double glazing could save you around £270 per year on your energy bills or 26% on heating bills.
By simply using a C rated window or above the amount of energy lost through windows by up to 90%. That’s enough energy to;
- Run 9 televisions for a year *
- Drive over 600 miles in an average sized car *
- make 34,000 cups of tea *
(* estimates by energy.gov)
A smaller carbon footprint: by using less fuel, you’ll generate less of the carbon dioxide that leads to global warming - typically, 680kg a year.
How energy-efficient glazing works
Double-glazed windows have two sheets of glass with a gap between them, usually about 16mm, to create an insulating barrier that keeps the heat in - sometimes filled with Argon gas.
Triple-glazed windows have three sheets of glass, but aren’t always better than double-glazed windows.
The problems with old sealed units:
Most energy-efficient glass for double glazing is low emissivity (Low-E) glass. This often has an unnoticeable coating of metal oxide, normally on one of the internal panes next to the gap. This lets in light and heat but cuts the amount of heat that can get out.
Very efficient windows might use gases such as argon, xenon or krypton in the gap between the sheets of glass, with the gas inserted the glass is capable of achieving an A rating on the WER (Window Energy Rating).