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Interestingly (or perhaps not…) the EPC on our old Edwardian house, with original, albeit refurbished, sash windows unsurprisingly recommended replacement with double glazed units as they could save up to £172 a year on heating costs. But I also know that decent ‘heritage’ double glazed units that wouldn’t complete destroy the look of the house would have cost north of £40k fitted, so heating costs would need to go up an awful lot to ever make that a sensible economic decision, even assuming you’d be allowed to do it by the planners…
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