As the name suggests, the triple glazed sealed glass unit is made up by three panes of glass which create two insulating cavities to provide unrivalled thermal and acoustic insulation. Although it is possible to have sealed units that incorporate more than three panes of glass, studies have shown that three is the optimum number,and that triple glazing is ideal in terms of energy efficiency and value for money.

Visually, triple glazed windows are as stylish and appealing as their double glazed counterparts, but in terms of performance triple glazing is superior thanks to two panes of Low E glass (the internal and middle panes), two warm edge spacer bars and two argon-filled cavities. Add to this the external pane of glass – which lets in more of the suns warmth – and the UPVC window