Industries require refrigeration system for process purpose wherein temperature control at user end and time is very important. The system temperature varies over large span of +7 0C to -75 0C. The system comprises of generation, transmission and distribution with centralized or decentralized chillers. The study typically involves generation mapping and various possibilities of improving the generation efficiency like loading on individual compressor, improving specific energy consumption, integration of chillers, hot well – cold well system or single pump system etc. Industries particularly where chemicals are used, also require ventilation system as part of statutory requirement and also to maintain air changes to maintain process area temperature and VOC limit.