Respondents highlighted some other issues including challenges in improving energy efficiency ratings, and how social housing may tend to have more energy-efficient homes.
Nododd ymatebwyr rai materion eraill, gan gynnwys heriau o ran gwella graddau effeithlonrwydd ynni, a sut y tueddir i weld cartrefi mwy effeithlon o ran ynni yn y sector tai cymdeithasol.