Abstract: An improvement in an environment heating and cooling system in which air is circulated in heat exchange relationship with a first heat exchanger and the enclosed space to be air conditioned characterized by hot and cold heat exchangers at the surface connected in respective heating and cooling fluid circuits with, respectively, remote buried heat and cold storage areas; with respective pump means for pumping in both directions through the respective heat and cold storage areas for putting either heat or cold into the storage areas and removing therefrom, heat or cooling capacity. Also disclosed are preferred embodiments, piping interconnections and the like, including an embodiment in which a supplemental mechanical refrigeration unit is employed for use during time of bargain electrical rates to store excess cooling capacity in the cold storage area.