Kildare has the highest number of homes with the best energy rating.
It's followed by county Dublin and Meath, according to the CSO.
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 million BER ratings have been given out since 2009.
UPDATE: Missing Newtownmountkennedy Teenager Located
Tánaiste Simon Harris Has No Unresolved Issues Amid Overpayments Controversy
Rowing Ireland Refused Permission for Training Centre in Co Wicklow
Social Media Chiefs Must Face The Rigours Of The Law Over AI Imagery Says Wicklow Wexford TD
UPDATE: Crews Working To Restore Supply To North Wicklow After Burst Water Mains In Newtownmountkennedy
