Clare is one of only two counties in Ireland which has virtually no homes that are of the highest energy-efficient standards.
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New CSO figures show only 1 per cent of the county's houses are of a B2 BER Rating, and 0 per cent of homes in the A or B1 categories.
By contrast, 11 per cent of homes in Dublin County are in the three highest brackets.
Over half of homes are ranked between C2 and D2, while eight per cent of homes are of the least energy-efficient category, G.
Heating oil is the main fuel burned in 60 per cent of Clare homes,
