Abstract: A concrete slab forming a part of the building structure foundation is thermally insulated about its periphery from the ground upon which it resides from the ground surface to below the ground frost line, with the bottom of the slab in heat transfer relation to the ground below the frost line over a large part of the building structure surface area. The concrete slab directly overlies and is in thermal contact with an array of side abutting parallel rows of end abutting hollow cinder blocks to form air passageways for circulating air beneath the conrete slab and between the ground and the slab. By thermal siphon or forced air circulation, air, within the building structure transfers heat to and from the concrete slab, particularly heat entering glassed walls and impinging directly upon the surface of the concrete slab.

Abstract: System using solar energy to heat a fluid in a heat storage tank can be utilized in either a heating mode or cooling mode. In the heating mode, several valves are actuated to cause fluid contained in an internal heat exchanger in the heat storage tank to circulate in series circuit with external heat exchange means in communication with the space to be heated. In the cooling mode, the valves are operated to cause the heated fluid in the internal heat exchanger mounted in the heat storage tank to circulate to a heat exchanger mounted in a refrigerant boiler. As the refrigerant boils, vapors are formed which pass through an ejector. The expanded refrigerant vapors are then condensed to liquid in a fan cooled condenser and a portion of the liquid is returned to the refrigerant boiler by a refrigerant circulating pump.