The purpose of the writing of this thesis is to utilize exhaust heat from the condenser return air dumped unceremoniously into the environment. By reducing the waste heat emitted by the condenser AIR CONDITIONING can reduce electricity consumption that have an impact on energy savings and reduction of the effects of global warming. This research was conducted for three months starting in October up to December 2015. This research was conducted on the data capture form input water temperature, water temperature, air temperature, the output temperature of the compressor output, the output temperature of the condenser, evaporator output temperature, and the temperature of the surface of copper pipe in heat exchanger. Whereas in penunjangnya data retrieval done data retrieval on the pressure of the refrigerant, and the current system. Temperature data retrieval research done at 3 different refrigerant pressure, refrigerant pressure, 75, 80 and 70 psi. The research results showed that the water heating systems using the heat exchanger type serpentine or circular performance is strongly affected by the pressure of the refrigerant. This relates to the higher pressure of the refrigerant, then the higher the temperature generated the compressor so that the temperature of the water produced will be the faster heat. The efficiency of isentropik compressor is best found in the serpentine type heat exchanger testing with the magnitude of the value of efficiency at 80 psi of 87.30% and a decrease in efficiency are not too big when compared with the type of circular and without using a heat exchanger. While a comparison of the efficiency of the heat exchanger between the serpentine type with type circular it can be concluded that the efficiency is the best there is on the circular type heat exchanger with the magnitude of the efficiency of 69,34%.
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