Abstract: Precision air conditioning outdoor units typically generate significant noise during operation, which can have an impact on the surrounding area. In order to solve the noise problem caused by precision air conditioning outdoor units in an office building and surrounding residential areas, the current situation was analyzed, and the renovation plan was designed. The characteristics and feasibility of this plan in terms of sound insulation and noise reduction, air flow field, temperature field changes, and other aspects were analyzed through three-dimensional modeling and simulation calculation. The solution can not only solve the noise problem, but also ensure the safe and stable operation of the outdoor unit. Finally, comparing the test data before and after the renovation, it was found that the effect after the renovation was good, and the background noise in the office and the noise transmitted to residential areas both met national standards. The research results have certain guiding significance for the sound insulation and noise reduction engineering application of precision air conditioning outdoor units.