Adding a window air conditioner with a cost of 100 yuan generally does not need to add refrigerant from beginning to end because there is no problem of installing indoor and outdoor units on site.

Split air conditioners have a field installation problem. When the copper pipes of indoor unit and outdoor unit are connected, it is inevitable that there will be chronic air leakage. A good quality and installed air conditioner can last for about ten years, and usually it can last for seven or eight years with refrigerant. Air conditioners with poor quality and poor installation may be added in a year or two, and some even need to be added in a few days.