Is the cleaning and disinfection cost of central air conditioning borne by the owner or the user?

I work in a central air conditioning cleaning company. The fact is that many properties do not have this item when signing contracts with the owners. Those properties will only clean the shell of the central air conditioner themselves, and they are too lazy to find a cleaning company to do the complicated cleaning inside. According to the minimum cleaning price per square meter 10 yuan, a 40,000-square-meter building costs 400,000 yuan. Want to know the information of central air conditioning cleaning, you can search Baidu for "central air conditioning cleaning Rong Hui"