Bu Arolwg Cyflwr Tai Cymru 2017-18 yn casglu gwybodaeth am gyflwr ac effeithlonrwydd ynni pob math o gartref a feddiannir yng Nghymru. Roedd yr arolwg wedi datgelu bod effeithlonrwydd ynni a diogelwch mewn tai wedi gwella'n raddol hefyd.
The Welsh Housing Conditions Survey 2017-18 collected information about the condition and energy efficiency of all types of occupied housing in Wales. The survey also revealed steady improvements in energy efficiency and safety in housing.