Just 2% of the homes assessed in Clare so far this year have been awarded the top grade for Building Energy Rating.
New Central Statistics Office data shows in the first quarter of the year, just 21 of the buildings were awarded an A1 rating.
Clare ranked in the bottom 10 in Ireland for the amount of A1 ratings and is the lowest figure seen in Munster.
Overall, 17% of homes assessed received either an A1, A2 or A3 grade.
This ranks higher than the average seen in the county since 2009, during which time 9% of homes were awarded some form of A grade.
On the other end of the spectrum 7% of the dwellings assessed between January and March received either an F or G building energy rating.
However, this represents the fourth lowest amount recorded across the country and the lowest total seen in the province while also ranking lower than the 12% average recorded since 2009.
B3 was the most common grade awarded across the first three months with 100 homes awarded this grade, while 237 dwellings received a grade in the B category, representing 29% of all homes assessed.
