of the coils until substantially all of the water within the tank at least in the vicinity of the coils is frozen solid this solid freezing is indicated by the lowering of the evaporator pressure below a set value which causes the pressure detector 63 to shut down the compressor 56 with the ice frozen solid and with compressor 56 shut off the system will remain in stand by until air conditioning is called for within conditioned space 13 by the thermostat not shown located therein when air conditioning is called for as indicated by the thermostat during peak demand hours refrigerant pump 74 comes on as well as air pump 62 pump 74 will move the cold refrigerant out of the coils 24 through tube 48 through check valve 76 and into tube 48 through open solenoid 70 and then into evaporator unit 14 which is a standard commercially available evaporator unit the liquid refrigerant is substantially changed from cold liquid to vapor within evaporator 14 resulting in cooling or air conditioning space 13 the vapor from evaporator unit 14 as well as any remaining liquid is transferred from the evaporator unit 14 through tube 80 to accumulator 30 since the condensing unit is.