What is double glazing, and what are the advantages over single glazing?

Double-glazed windows consist of two panes of glass separated by a layer of air. Double glazing has many benefits over single glazing (where there’s just one pane of glass and no air layer): Keeps warm air in, meaning your property is better insulated. This results in fewer draughts and cheaper heating bills. Keeps noise out – you’ll hear far less noise from outside with double glazing. Reduces the amount of condensation on the inside of your windows. Heightens security – double-glazed glass is more difficult to break than single glazing.

 

What is double glazing, and what are the advantages over single glazing?

Double-glazed windows consist of two panes of glass separated by a layer of air. Double glazing has many benefits over single glazing (where there’s just one pane of glass and no air layer): Keeps warm air in, meaning your property is better insulated. This results in fewer draughts and cheaper heating bills. Keeps noise out – you’ll hear far less noise from outside with double glazing. Reduces the amount of condensation on the inside of your windows. Heightens security – double-glazed glass is more difficult to break than single glazing. Double Glazing window prices – How much cheaper will my energy bills be if I install double glazing? If you were to replace all of the windows in a three-bedroom, semi-detached house, going from single-glazed windows to double glazing. The cost of double glazing and the Energy Saving Trust says that you’d save between £75 and £100 per year with B-rated glass and £85-£110 per year with A-rated glass. As double glazing should last for at least 20 years, that’s a saving of between £1,500 and £2,200 over 20 years.  The picture below is a thermal image showing the difference in heat loss between single-glazed and double-glazed windows. The house on the left has a single-glazed window where we can see more heat escaping – indicated by the bright-yellow colours.

Double Glazed open Window

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