Kildare has the highest number of homes with the best energy rating.
20% of homes in Kildare which have been tested for a BER rating were given an A standard, while Meath and county Dublin have 19% and for Wicklow it's 15%.
The Building Energy Rating calculates a house's efficiency.
Roscommon and Leitrim have the highest proportion of G ratings - which is the worst awarded.
Both counties have 12% G rated - followed by Tipperary on 11%, and Mayo and Westmeath with 10%.
Longford and Leitrim have the fewest BER ratings, while Dublin's postal districts have the most with 229,000.
C2 and C3 are the most common ratings nationally at 12%.
In total over 1,000,000 BER ratings have been given out since 2009.
Meanwhile, 43% of homes nationally with a BER rating were awarded a D1 or less.
The county with the highest proportion of D or worse rated homes is Tipperary with 53% getting at most a D grade.
That's followed by Leitrim and Mayo on 51%, and Longford on 50%.
The figures show the state has a long way to go to retrofit the country's houses in an attempt to bring down carbon emissions, while at the same time energy prices are only going one way.
