Aziz, AzridjalSatria, Arya Bhima2016-04-192016-04-192016-04-19wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/8207This paper presents the experimental performance study to observe the effect of changes in the cooling load of the combined air conditioning and water heating system with trombone coil type as dummy condenser using heat wasted from split type air conditioner. Effects of the following parameters to the system performance were examined: compressor power test chamber, test chamber temperature, condenser temperature, hot water temperature and Coefficient of Performance (COP). The results showed that the bigger the cooling load is given in the test chamber, the bigger the heat absorbed in the evaporator, so the higher the temperature of the hot water in a tank. COP increased with increasing of cooling loads. It was concluded that by combined air conditioning and water heating system so that space cooling and water heating can take place simultaneously, and the energy performance can be raised considerably.enair conditioningwater heatercooling loadCOPcompressor powerUR-Scientific Work Lecturer