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A feasibility study was carried out on developing a centralized data management system (CDMS) for a cluster of distributed HVAC systems with expert service via Internet.Currently almost all HVAC systems use non-dedicated commercial SCADA programs and operated by the workforce with limited skill,thus cause the suboptimal operation of HVAC system.As an improvement,a project was conducted on behalf of a property management company in China to develop a CDMS which can generate optimal operating strategy and provide expert service for its twenty building blocks distributed all over China.With the floor area of 200,000 m2,each building block has now equipped with a modem HVAC and SCADA system.But the operating state and power consumption level are restricted by the operators.Each HVAC system consumes electricity about 8,611,000 kWh/a (￥4,563,830/a).With a potentiality of 10％ of power saving with the help of the CDMS,it was estimated that 20 stations would save about 16,000,000 kWh/a (￥8,000,000/a),being equivalent to about 17,000 t of CO2 emission.While the initial investment of the CDMS was about ￥4,000,000,so the energy saving worked out the payback period of half a year for the project investment.