A lockable temperature controlled storage apparatus comprising; a) two or more lockable storage spaces (22, 22a,22b), wherein each of two or more lockable storage spaces (22, 22a,22b) comprises at least one compartment (24,28,30) 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 (24,28,30); 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 (24,28,30); 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 (24,28,30) 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 (24,28,30) 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 (22, 22a,22b), wherein each of two or more lockable storage spaces (22, 22a,22b) comprises at least one compartment (24,28,30) 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 (24,28,30); 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 (24,28,30); 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 (24,28,30) 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 (24,28,30) 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 (24,28,30) 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 (24,28,30) 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.