National Geographic : 1981 Feb 28
;/~ ~;j t~ EARTH SHELTER Sod houses of the GreatPlains helped cool in summer, warm in winter. Some modern variantsare put below the frost line, where temperatures fluctuate little. N PAINTINGBY WILLIAM H. BOND NATIONALGEOGRAPHICART DIVISION WITHTHE COOPERATIONOF DAVID C. BULLEN,AIA SITIERMAL INERTIA Slow to heat and cool, desert adobe houses, like the thick wall, floor, and rock bed, absorb day's warmth to radiate it at night. S* i~I "... i I"l .1 VENTILATION In the tropics, houses are raised and open toward prevailing breezes. In Geohouse, windows, ventilators, and vents in the greenhouse wall ensure adequate air exchange and mixing.