What is the average saving to householder between A, B & C rated windows in terms of energy and cost savings?
A, B and C rated windows are all much more energy efficient than standard windows. That said, there are differences in performance of energy efficient windows with A B and C ratings; • Changing existing single-glazed, timber windows to Band C windows in a semi detached, gas fuelled house would be expected to save £4350 in heating costs and 11 tonnes CO2 over the life of the windows. • If the new windows are instead B-rated then the savings increase to £4650 and 11.5 tonnes CO2 . • And, if the new windows are instead A-rated then the savings increase to nearly £5000 and over 12 tonnes CO2 . The above shows that achievement of the level C displays significant savings over existing windows with higher ratings of B and A delivering further smaller incremental savings above C.
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