Hi Permafrost

Several things to consider:

Temperature and Relative humidity outside cold room. Should be low.
Design of automatic doors
Electric heating of floor in doors areas.
Evaportators should be installed outside the cold room in order to avoid problems with snow and fog during defrost cycles
Consider moving racks like Storax Systems (excellent)
Other compressor brand: Howden
Led lights to reduce light heat load.
Backup electric power
Better many small compressors than few large ones

Regards

Lorenzo (lhill)