Multi-temperature storage system

A multi-temperature storage system comprising:

• A) a grid framework structure configured for supporting a robotic load handling device thereupon, said grid framework structure including:
• i) a track system including a plurality of tracks arranged in a grid pattern including a plurality of grid cells, and
• ii) a supporting framework structure for supporting the track system above the ground to create a storage space with a plurality of storage columns, each storage column being arranged to store a stack of storage containers, such that when a robotic load handling device is operative on the track system one or more containers are lifted through a grid cell from a stack in a storage column,
• wherein a portion of the storage system is contained within an enclosure, said enclosure having an opening above the track system for allowing a robotic load handling device to move into and out of the enclosure;
• B) a temperature control system including an inlet for drawing a fluid from the enclosure, a temperature control unit for heating or cooling the fluid to a temperature controlled fluid, and an outlet for providing the temperature controlled fluid into the enclosure such that the enclosure has a different temperature than the temperature external of the enclosure;
• and
• C) at least one air curtain unit arranged above the track system, said at least one air curtain unit being arranged to recirculate the temperature controlled fluid from the enclosure to provide an air curtain across the opening of the enclosure so as to substantially contain the temperature controlled fluid within the enclosure and enable a robotic load handling device to move on the track system into and out of the enclosure.