Abstract: A temperature control system for a building wherein a solar collector extends substantially coextensive with at least a portion of at least one vertical wall of the building. The system includes a solar collector and storage unit having means connected thereto for circulating air through such components during a collecting mode at a first predetermined temperature. Air is exhausted from such components during a dumping mode at a second predetermined temperature. Thermostat means are provided to cause air to flow through the storage unit into the building during a heating mode at a third predetermined temperature.