From a review of a number of vernacular and modern environmental solutions and a study of local climatic, social and economic features in North Africa, a new design of roof system is developed. The new system is designed for inducing natural ventilation and cooling in summer and provision of heating in winter. It incorporates a transparent dome and a pitched thermal storage roof. In summer natural air movement is promoted by wind action on the dome apex while the thermal storage roof is used as a heat sink for space cooling. In winter, solar radiation absorbed by the pitched roof components is radiated to the space below in the form of thermal energy. The natural ventilation performance of the new system is investigated using a scale model mounted inside a boundary layer wind tunnel. Development of the thermal storage roof components is carried-out within a Computational Fluid Dynamics software (FLUENT) developed by Fluent Inc. Verification of the computer results is undertaken using real sized models of the pitched roof components and a solar simulator.