A lockable temperature controlled storage apparatus comprising; a) two or more lockable storage spaces , wherein each of two or more lockable storage spaces comprises at least one compartment comprising a heat exchanger or an evaporator in fluid communication with a heat transfer fluid; each of said compartments comprising a first temperature sensing device wherein the temperature measurement from the first temperature sensing device is an indication of the air temperature inside said at least one compartment ; b) at least one common distribution system comprising the heat transfer fluid that is arranged to be in cooperation with a refrigeration system, said at least one common distribution system distributing the heat transfer fluid at a supplied pressure to exchange heat with the at least one compartment ; characterised in further comprising c) a second temperature sensing device adjacent the heat exchanger or evaporator to substantially represent the temperature of the heat exchanger or evaporator d) a controller arranged to: i) interrupt the flow of heat transfer fluid to at least one compartment when the temperature from the second temperature sensing device reaches a lower limit and re-establish the flow of heat transfer fluid to exchange heat with said at least one compartment when the temperature from the second temperature sensing device reaches an upper limit; ii) repeat step (i) until the temperature from the first temperature sensing device reaches a predetermined set point temperature. a) two or more lockable storage spaces , wherein each of two or more lockable storage spaces comprises at least one compartment comprising a heat exchanger or an evaporator in fluid communication with a heat transfer fluid; each of said compartments comprising a first temperature sensing device wherein the temperature measurement from the first temperature sensing device is an indication of the air temperature inside said at least one compartment ; b) at least one common distribution system comprising the heat transfer fluid that is arranged to be in cooperation with a refrigeration system, said at least one common distribution system distributing the heat transfer fluid at a supplied pressure to exchange heat with the at least one compartment ; characterised in further comprising c) a second temperature sensing device adjacent the heat exchanger or evaporator to substantially represent the temperature of the heat exchanger or evaporator d) a controller arranged to: i) interrupt the flow of heat transfer fluid to at least one compartment when the temperature from the second temperature sensing device reaches a lower limit and re-establish the flow of heat transfer fluid to exchange heat with said at least one compartment when the temperature from the second temperature sensing device reaches an upper limit; ii) repeat step (i) until the temperature from the first temperature sensing device reaches a predetermined set point temperature. i) interrupt the flow of heat transfer fluid to at least one compartment when the temperature from the second temperature sensing device reaches a lower limit and re-establish the flow of heat transfer fluid to exchange heat with said at least one compartment when the temperature from the second temperature sensing device reaches an upper limit; ii) repeat step (i) until the temperature from the first temperature sensing device reaches a predetermined set point temperature. <EOS>