This promising model for this rapid heating-cooling device is a two ways heat pump that can generate heat and cool down by adsorption and desorption processes of desiccant. First two desiccants that are a conventional one treated with silica gel and another one is zeolite 13X were tested. By comparing basic characteristics of these desiccants such as humidity adsorption capacity, specific surface area, pore size and particle size was clarified that zeolite 13X has better performance in order to adsorb water vapor than silica gel. So, the zeolite 13X has been chosen for test material in this research. Then, a test device that contains the zeolite 13x was fabricated, and the performance of heat generation and cooling was experimentally examined. The results showed that this device can raise surrounding solid wall's temperature up to 40 K higher by adsorption of humidity and the maximum rate of heat generation is 4.8 W/g. It is also be able to cool down surrounding solid wall's temperature 15 K lower by desorption of water from the desiccant. Using the obtained results, a model that can estimate the heat generation/cooling process in the device was derived, and the optimum operation condition was discussed for injection molding application.