an absorption cold and warm water system utilizing solar heat includes a low temperature heat generator using as a heating source low temperature warm water obtained by heating water by the solar heat , a high temperature generator using an ancillary heat source as a heating source when the system runs short of the solar heat , and a low temperature generator . the cold and warm water system is provided with an operation device operative , when the cold and warm water system is in condition in which refrigerating and heating outputs can be provided by using the low temperature warm water , to allow the low temperature warm water to be continuously fed to the cold and warm water system and to control the volume of a solution and a refrigerant in circulation in accordance with temperatures of the cold and warm water , to thereby store the solar heat in the cold and warm water system .