Abstract: Precision air conditioner outdoor units typically generate significant noise during operation, which can have an impact on noise level in the surrounding area. In order to solve the noise problem in an office building and surrounding residential areas caused by precision air conditioner outdoor units, the current situation is analyzed, and the renovation plan is designed. The characteristics and feasibility of this plan are analyzed through three-dimensional modeling and simulation calculation in terms of sound insulation and noise reduction, air flow field, temperature field changes, and other aspects. 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 is shown that the effect after the renovation is good, and the background noise in the office and the noise transmitted to residential areas both meet national standards. The research results have certain guiding significance for the sound insulation and noise reduction engineering application of precision air conditioner outdoor units.