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  • Anyone know anything about windows? The double glazed units in our 30s semi are about 30 years old and on their last legs and I'd like to upgrade them with a significant gain in thermal efficiency in mind. They are two large bay windows that make up 80% of the exterior wall face of the rooms so how well they work thermally should hopefully make a big difference.

    Alu or uPVC?
    Double or triple?
    Any recommendations for contractors?

    I like the slimness of alu, but not at the expense of a big hit in thermal efficiency.

    Any thoughts would be much appreciated.

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