Abstract: Solar heating system employing a attic solar collector with a transparent wall facing the sun and a heat absorbing interior in order to heat the air within; a first heat pump to transmit heat from the collector to a remote storage reservoir; and a second heat pump to transfer heat either way between the reservoir and a living space to be heated or cooled. The heat input to the first heat pump is controlled by a damper actuated by excess pressure in the heat pump suction line to decrease air flow across the refrigerant coil of the first heat pump which collects the heat from the attic. A similar damper connected to a refrigerant line for the second heat pump similarly controls heat transfer between a refrigerant coil of the second heat pump and the air space to be heated. The dampers modulate the collection and transfer of heat by the heat pumps to maintain the heat pumps in efficient operating temperature and pressure ranges.