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• Recommended winter indoor temperature threshold for healthy living is at least 18°C. • Most homes are below recommended temperature threshold for many hours in a day. • Significant risk factors are older, detached, single occupancy, Northern England dwellings. • Being aged above 64 and having a disability is linked to increased hours above 18°C. This study investigated the determinants of the proportion of hours a dwelling meets the indoor temperature threshold for healthy living of at least 18°C in winter, as recommended in a recent review. Secondary data analysis of a nationally representative survey of English homes (N = 635) showed that older dwellings, detached homes, single occupancy and living in the North of England are associated with the lowest share of hours at the recommended temperature threshold in bedroom, living room, and hallway. These identified determinants could be used to target households at greatest risk of 'unhealthy' temperatures. Being aged above 64 and having a disability is linked to more hours at the criterion; an encouraging finding that the most vulnerable experience low temperatures to a lesser extent. This study also highlights the need for further research particularly in relation to those variables where results were equivocal and / or there was weak supporting evidence, such as tenure, wall type, and EPC rating. [ABSTRACT FROM AUTHOR]