According to the Welsh Housing Conditions Survey, 2017-18, 47% of residential dwellings were considered to have adequate energy performance (a SAP rating of 65 or above).
Yn ôl Arolwg Cyflwr Tai Cymru, 2017-18, ystyriwyd bod gan 47% o anheddau preswyl berfformiad ynni digonol (sgôr SAP o 65 neu uwch).