Low-E Window Coating, 20mm

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Hi,

In a semi-detached house and have 2 very large windows in the hall going up the stairs, old style double glazing small gap. I loose a lot of heat from these windows and its makes the house very cold. I cant have cavity wall insulation (no cavity), so I was looking at double glazing options.

I have read about some double glazing that has a Low-E soft coating that is ideal for insulation, ideally with a 20mm gap. Should this type of window be easy to get hold of through a normal double glazing supplier / fitter or is it a more specilized ?

Cheers
 
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A 16mm gap will be about as good as a 20mm gap. With larger gaps convection within the unit reduces insulation effect.

Most smaller makers of units can't use soft coat low e as it takes specialised equipment to handle but your local suppier should be able to get soft coat units for you - if a bit more expensively. The Pilkington version is called 'Optitherm'.
 

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