In this paper, three solar water heating systems with a heat pump are designed for resorts located at three famous tourist destinations in Vietnam: Phu Quoc island and the towns of Bao Loc, and Sa Pa. These places represent the Southern, Central, and Northern regions of Vietnam, respectively. Ecotect and Grasshopper software applications are employed with the latest weather, heat, and radiation data and was obtained from . Data analysis is based on Ecotect software and the computational design is done in Grasshopper software. | The efficiency of solar water heating system with heat pump software application designed for resorts in Vietnam -