The data set comprises the digitised data from energy behaviour diaries produced by nine heritage building case studies. <div><br></div><div>Each case study has two diaries, a summer version and a winter version. </div><div><br></div><div>Each diary includes information on heating, lighting and ventilation settings and changes. Residents' activities, locations in their buildings and clothing levels.</div><div><br></div><div>Participants were also provided with two digital thermometers which record maximum, minimum and current temperatures. One thermometer was placed outside the building, in a sheltered location not in direct sunlight. The other thermometer was placed in participants' main living spaces away from any heat emitters. The thermometers were checked once a day, all three values noted down and then the memory function reset. </div><div><br></div><div>The data from the diaries has been digitised and included in an excel spreadsheet. Also included are digital copies of the diaries that were presented to participants for their completion. </div><div><br></div>