The Energy Consumption always takes high percentage of operation cost for hyper market, and cost for entailing the whole energy-saving system is also high which keeps the owner on the fence. One energy-saving system integrator are trying to build the smart HVAC solutions which can operate based on the operation hours and real facility condition, and also visualize the system status and energy consumption on the cloud for the top hypermarket chain with Moxa's I/O solution. I act as the Moxa solution consultant to propose the system topology design and technical consultancy with customer through two years of preliminary evaluation, proof of concept, and finally the commercial operation. The new system now can save up to 35% of the HVAC electricity fees for the store along with the new leasing business model. Moreover the cloud monitoring platform also can make system maintenance and data visualization easier than ever.