Nowadays one of the common aircon problems is aircon making noise. The aircon noise issue might be multiple parts fault in the inside aircon unit or If Your aircon may run without aircon servicing. When you hear a different kind of noise from your aircon unit. then you could hire technical experts (experienced people) to troubleshoot the noise issue. https://coolcare.com.sg/does-your-aircon-have-a-noise-issue-how-to-fix-it/