Choosing your windows

The best thermal insulation glass.

Low E windows with the highest performing double glazing window energy ratings use a combination of Low E glass, warm edge spacers and argon gas-filled cavity.
Warm edge (or thermal break) spacers reduce the heat lost around the perimeter of a double glazing window by replacing conventional aluminium with a low heat-conductive material. Some double glazing window can provide nearly 1,000 times more thermal insulation than aluminium spacer bars, improving the energy efficiency of Low E windows by 40 to 50%.
As with aluminium, thermal break spacer bars are filled with a silicone desiccant to absorb any moisture within the double glazing window and can contain dry air or gas-filled cavities. Thermal break spacer bars further reduce condensation on the room-facing surface of the double glazing window as they transmit less of a temperature difference to the interior pane.
Warm edge spacer bars have the same geometrical form as a metal spacer bar, but are usually made from a fibre-glass reinforced insulation material. An ultra-thin foil lining acts as a barrier to the gas or air trapped within the cavity. Some warm edge spacers are available in an array of different colours and can be used for Georgian-style double glazing window.

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