Pyramid roof lantern - double or triple glazed?

18 Oct 2013
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United Kingdom
Im looking for a 3m by 1m roof lantern. Cost is about £2k for a double glazed aluminium one or about £4K for triple glazed.

Given the cost I know which I will be going for but even if I do find a cheaper triple glazed one, is there any real savings energy wise on a triple glazed version pyramid roof lantern? What should I be looking for in terms of quality? Was thinking about Sun Square Ltd over someone like Roof Maker Ltd.
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