The reduction of electrical energy consumption is the major issue for energy conservation in building. Ice slurry offers advantages in efficient cooling medium, capable of shifting the electricity demand and reduction in size of system compared over conventional cooling system. In this study, an attempt was made to develop an ice slurry as an efficient cooling application for replacing excessive use of indoor air condition. The cooling load is investigated through a case study in office building. Moreover, effect pump rotation and scraper are carried out to find out the optimum performance of ice slurry system. An evaluation from cooling load analysis reveals that two ice slurry generators can fulfil the demand of cooling load from sample building. The results show that higher speed of pump and scraper give best result regarding power consumption and ice production rate. It is concluded that ice slurry is a rewarding technology for thermal energy storage, especially in air conditioning application.