Abstract: A solar heat storage and heat pump system includes an insulated heat storage vessel filled by a liquid heat storage medium. A first heat exchanger is deeply immersed in the storage vessel, with solar panel means operatively connected by a pair of delivery and return conduits to the first heat exchanger for delivery of solar-heated liquid to the first heat exchanger, and return. A second heat exchanger is shallowly immersed in the vessel, and a heat pump is operatively connected by a pair of conduits to the second heat exchanger for pumped circulating delivery of heat storage liquid to said heat pump for use in both heating and cooling operation.