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Climate change projections indicate that the UK is expected to experience morefrequent and more intense heat wave periods over the coming decades. Buildingsfrequently experience overheating even under the present climate, resulting indiscomfort, health complaints and even mortality. Current house building rates arelow, resulting in a need to adapt the existing building stock to provide morecomfortable and safe environments.Dynamic thermal simulation computer modelling was used to assess and rank theeffectiveness of selected single and combined interventions (adaptations) in reducingoverheating during a heat wave period for a range of dwelling types, orientations andoccupancy profiles. It is shown that solar protection interventions, such as windowshutters and solar reflective coatings, can be amongst the most effective at reducingoverheating during heat wave periods, but with a corresponding increase in annualspace heating energy use. Whereas the addition of wall insulation, though beneficialfor reducing energy use, may in some cases actually increase summer overheating.The results and guidance are presented in a way that allows identification of parts ofthe building stock most at risk and rapid selection of the best performing interventionsin terms of overheating reduction, cost and annual energy use. It is also shown thatabove certain cost levels there is a diminishing return in both overheatingperformance and energy use reduction.The results of this research will provide important information to supportrefurbishment decisions of both individual house owners and landlords responsiblefor multiple properties, such as housing associations and local authorities.

Assessment of interventions to reduce dwelling overheating during heat waves considering annual energy use and cost