Some people say it's best to "wait and see." You can never tell if new technology might not be developed within a year or two that would permit one to just pump in a different refrigerant while preserving the main centrifugal chiller unit.
也有人主張「等等看」，說不定科技進步神速，一兩年內就會研發出可以保留離心式主機、只要直接灌充新冷媒的新技術。