Under the Montreal Protocol stipulates : destruction of the ozone layer, harm the Earth's environment specific Freon (CFC) in 2000 before the worldwide ban. After the scientific community's ongoing efforts, Application of HFC 134a of this 100% non-CFC refrigerant in the new refrigeration system is extremely environmental and energy-saving design After being applied to the dehumidifier, in the "hills. health "and the trend of consumption, CFC refrigerant R22 the dehumidifier future maintenance caused certain difficulties.