Generally speaking, refrigerant in compressors in alternately cooled and heated so that it is kept in constant use. If there is no leak in the hoses, then the refrigerant should last five to eight years without needing to be refilled.
一般說來，冷媒在密閉系統（壓縮機）中以熱漲冷縮方式反覆使用，只要管線沒有破裂外漏，應該可以連續使用五到八年，不必填充冷媒。