Increasing building thermal mass is regarded as one of the useful methods of preventing overheating in the future. This paper focuses on the energy saving potential with a new building system, hybrid timber building system, when thermal mass is taken into consideration. Because the performance of thermal mass can be influenced by climate condition, the simulation progress will therefore include several different cities with different climate conditions. Findings of this research may help build a clearer awareness on the works of thermal mass, as well as discuss whether timber concrete floor system is a good choice for energy saving when energy consumed by materials is considered.
