The development of unmanned surface vehicles for military and commercial needs is increasing as the development of autonomous control systems. The farther the operation range of unmanned surface vehicles makes the propulsion motor generated heat and decreased the performance of the vehicle. This study aims to analyze the application of a thermoelectric cooler to decrease the temperature of the electric motors as a propulsion system on the unmanned surface vehicle. The research was carried out by prototyping the thermoelectric cooler 12V and tested at the prototype of unmanned surface vehicles with a length overall 1.5 m. The results showed the application of a thermoelectric cooler potentially effective to decrease the electric motor temperature by as much as 26.3 ?C by neglect the heat loss due to convection. The results of this study contributed to the development of reliable unmanned surface vehicles.