There is a wide range of noise levels with fans. You might have several in your desktop that would need to be swapped to make it “quiet”, but there are some good options you can buy that I would consider unobtrusive even in a quiet room.
I’d at least look into that if your machine still does everything you need it to. Unless you need to replace quite a few fans, in which case it might be smarter to put that money towards something different.
