Passive Cooling: Rock Wall. A Natural Thermostat: "Large rocks squeezed into together by 'wood shelves' insulate the South face of the house. The rocks absorb the heat during the day lowering the solar gain. At night the rocks give heat back into into the air as the temperature outside drops. The rock wall and the desert climate work in concert to passively cool the house."
Climate zones of Africa, showing the ecological break between the hot desert climate of North Africa and the Horn of Africa (red), the hot semi-arid climate of the Sahel and areas surrounding deserts (orange) and the tropical climate of Central and Western Africa (blue). Southern Africa has a transition to semi-tropical or temperate climates (green), and more desert or semi-arid regions, centered on Namibia and Botswana.