Historic core of Split (on UNESCO-s World Heritage List since 1979; area: 216.613 m2, closed space: 170.607 m2) is faced with poor general condition of cultural heritage buildings, with trend of further deterioration, due to inadequate management system and lack of long term revitalization strategy. Energy efficiency, as global imperative in creating sustainable society, is also an important objective of sustainable development and integral conservation, both of which are indispensable building blocks of any modern revitalization strategy and historic core management systems. Taking above into account, possibilities for increasing energy efficiency of cultural heritage buildings, within Historic core of Split, by improving current management system and implementing revitalization project were analysed, and new management system was modelled.