Diankou Zhenxing Spring Factory, the predecessor of DunAn, was established.
In 1992, the Service Value was successfully trial-produced.
In 1995，Fin Heat Exchanger was launched.
In 1998, The first DunAn commercial air conditioner was developed.
In 2001, DunAn commercial air conditioner (Hangzhou) Research Institute was registered and established. Otherwise, the company was renamed a joint-stock company.
In 2004, DunAn Environment 002011 was listed in Shenzhen Stock Exchange.
In 2007, additionally issued refrigeration accessories to fully cover refrigeration and air-conditioning business.
In 2008, DunAn Metals (Thailand) Co.,Ltd was established.
In 2010, companies including Energy Saving, Baofu, Fengshen and Cold Chain were established successively.
In 2012, Sensor, Controller, DMQ, Thailand branch offices were established. Otherwise, DunAn Environment won the "National Quality Award”.
In 2014, the micro-channel heat exchanger project won the second prize of National Scientific and Technological Progress.
In 2016, DunAn Vehicle Thermal Management Technology Co., Ltd. and Memphis Company were established. DunAn Environment won the second prize of China Standard Innovation.
In 2018, the enterprise charter was revised to adjust the development strategy.
In 2020, optimization e.g. concentrating, innovation, self-control, automation, stock ownership.
In 2022, the controlling share of DunAn was held by Gree Group, so the company enters a new stage of development.
