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seani seani is offline
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Default Old double vs new triple glazing

I'm thinking or replacing some fairly elderly (20+ years I believe)
hardwood double glazing including a large set if hinged patio doors.

I'm thinking about good quality triple glazed units in both cases. Am
I likely to see much of an improvement given the extra layer and the
passage of time?

The patio doors in particular are draughty anyway so I'd expect to see
improvement there. Also are any of the modern alternatives to hardwood
any good?