| Summary: | Heritage architecture, which considers the local climate, building materials, and construction methods, can contribute to the energy efficiency and sustainability of buildings. Retrofitting strategies can be applied to existing buildings to improve their energy performance while maintaining or enhancing their thermal comfort. This study involved an analysis of the indoor environment status at the Yonsei University Stimson Hall (completed in 1920), a building on the former Yonhee College (now Yonsei University). The analysis included temperature and humidity measurements over a one-year period in four rooms with different usage schedules and occupant types. It was found that the number of occupants and the usage schedule influenced the temperature distribution in the rooms. In addition, the effects of the retrofitting strategies on the building energy consumption were investigated. It was verified that the improvement in windows and the application of roof-type photovoltaic systems resulted in annual energy savings of up to 90.46% compared with reference buildings. In conclusion, the findings demonstrate the influence of variables such as usage schedule, occupant type, and season on the indoor climate, as well as the potential benefits and drawbacks of retrofitting strategies on energy consumption and thermal comfort.
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