How to write the noise transformation scheme of central air conditioning?

First of all, you should find out what scheme you have to improve the noise of air-conditioning box, then write down the specific implementation, then find a noisy air-conditioning box, write down the specific transformation methods and materials, as well as its cost, working hours, and then the expected effect. It is best to measure noise in decibels first, and then measure it after conversion. I don't know if you are just writing a transformation plan or doing it specifically!