A solar heating system for a building and other architectural structures including a solar heating system. The solar heating system comprises a solar heating module with an enclosure of panels bounding a plenum. An interior panel is disposed inside the enclosure. A collector panel, which is separated from the interior panel to define a heating chamber, is exposed to, and heated by, solar radiation. Outside air enters the heating chamber though passages in the collector panel, where the air is heated by heat transferred from the collector panel. An air-moving device is coupled with an air outlet from the plenum. The air-moving device applies a negative pressure in the heating chamber effective for drawing the outside air through the passages into the heating chamber and for withdrawing the heated air from the heating chamber through a delivery opening to the plenum for subsequent removal through the air outlet.