Less than 5% of house in County Wexford have achieved the highest energy rating in a new study.
The energy rating standard goes from A to G and measures how good a house is at retaining heat.
39% of homes in County Wexford are rated at C on the BER scale while just 3% are A rated.
Factors which influence energy rating include attic and wall insulation, double glaze windows ventilation and how air-tight it is.
Homes built in the 1980s and before typically rate from D to G, with G meaning a very badly insulated house.
8% of homes in Wexford fall into this category.
County Wexford is in the top three in the country when it comes dependence on oil for heating purposes with 70% of homes depending on it.
The average age of a house in the county is 29 years old.
