Under the background of the "dual carbon" goals, industry serves not only as the backbone of the national economy but also as the primary arena for achieving these targets. As China's advanced manufacturing sector continues to grow, the automotive industry has become one of the key economic pillars. Consequently, automotive component plants face increasingly stringent requirements for reliability, energy efficiency, and resilience in their HVAC and process cooling water systems, driven by both fierce market competition and the national "dual carbon" strategy. This paper introduces energy-saving measures implemented in phase II of the SEG Industrial Park project, including the design of a highly efficient central plant, the coupling of the air conditioning water system with the process cooling system, cooling tower free cooling, and exhaust air heat recovery. Practical results show that these measures have yielded considerable economic, social, and environmental benefits, providing valuable references for the design of HVAC systems in advanced precision manufacturing facilities.