This study aims to describe the feasibility of exhaust thermal energy utilization by using the PCM transportation. However, this system demands the space to put in the PCM containers at heat demand plants and heat supply plants. In this paper, we examined the method of exhaust heat utilization by PCM transportation to low/medium heat load density area. As a result, we confirmed that the more space there is, the more energy saving effect we can obtain. But, it is more rational to set a limit on the space for putting in the PCM containers.