And now a solar air heating system that would help keep your house warm. Scientists at the Turkish International Co-operation Agency have devised the system. It is designed to transfer solar energy acquired in the southern sunspace of an apartment to the northern glazed space through air ducts placed in the ceiling and floor. Heated air in the southern sunspace rises and enters the air ducts in the ceiling and passes to the northern area. The displaced air on the southern side is replaced by cooler air from the northern parts flowing through air ducts in the floor.