Abstract: A plurality of individual, isolatable storage bins carrying a desiccant such as silicon gel are selectively placed in communication with a heat reclaim/solar collector within a gas circulation loop to permit the desiccant material to be dried and to store heat almost indefinitely in its dry state. The bins may be selectively connected within a second circulation loop, including a room to be conditioned such that a second gas circulated over the desiccant and to the room varies the moisture content of the desiccant to release heat and to thereby effect controlled heating or cooling of the air within the room, as needed, and irrespective operation of the heat reclaim/solar collector.