Abstract: A solar heated building of generally hemispherical shape which supports on its surface solar heat collectors. The solar heat collectors are in the shape of spherical sectors and cover an arcuate area defined by the receipt of usable solar heat energy; consideration being given to the diurnal and seasonal positions of the sun. Heat collecting fluid is passed in thermal contact with the solar heat collectors and is in circulation with a heat storage reservoir. Air is passed in thermal contact with the solar heat collector to prevent overheating when the heat collecting fluid is cut off or to provide hot air when the heat storage reservoir is fully heated or when the solar heat collector is warmer than ambient but not hot enough to supply heat to the heat storage reservoir. The solar heat collectors are segregated by the heat collecting fluid circulation system piping into discrete arrays each covering about 15.degree.