In 2019, Longertek's ultra-low temperature heat pump air conditioners cooperated with CRRC ART smart rail project for the first time, successfully installed and delivered in batches; In 2019, Longertek Technology was listed on the Growth Enterprise Market of the Shenzhen Stock Exchange, stock code: 300594.

In 2018, Longertek's pure electric bus air conditioner was compared and verified on energy saving in 4 cities, and the power saving rate was more than 20%, which was recognized by customers; In 2018, the first domestic intelligent inverter heat pump air conditioner for intercity trains was successfully installed.

In 2017, Longertek Technology was listed on the new third board with stock code of 871452; In 2017, the research and development of integrated thermal management system for pure electric bus succeeded and a number of invention patents were obtained.

In 2017, Longertek Technology developed the first pure electric bus air conditioner for installing test, and the inverter air conditioners were produced in full series and put into the market, which were unanimously recognized by the market.

In 2016, China's first "5D" technology, ultra-thin, ultra-quiet, full DC technology inverter vehicle air conditioning was successfully developed; in 2016, the first domestic ultra-light carbon fiber inverter vehicle air conditioning and the first DC750V direct supply metro vehicle inverter air conditioning were successfully developed and installed.

In 2016, the company passed IATF 16949 certification. The series products of inverter air conditioner for passenger cars have been designed and the production license has been obtained.

In 2015, the first domestic DC1500V direct-supply inverter air conditioner for metro vehicles was successfully developed; In 2015, the company's products were selected into the National key energy saving and low carbon technology promotion catalogue (2015 edition, energy saving part) issued by the National Development and Reform Commission.

In 2015, the first 250 / 350 km / h EMU energy saving inverter air conditioner unit was developed, and it was independently designed and produced.

In 2013, the first domestic DC750V direct-supply technology tram inverter air conditioner was successfully developed and installed; In 2013, Longertek passed the IRIS certification of the international railway industry standard system.

In 2012, Longertek passed the EN15085 welding standard certification; the first domestic general-speed passenger car inverter air conditioner was installed in Jinan Railway Bureau.

In 2011, Longertek successfully developed inverter air conditioning controllers for electric vehicles and put them into the market in batches.

In 2009, the domestic rail industry completed the first comparison test of energy-saving technologies for on-board air conditioners. The test results show that, compared with the traditional fixed-speed air-conditioning, the average cooling power saving rate of inverter air-conditioning is more than 30%, the average heating energy saving rate is more than 40%, and the vehicle energy consumption is reduced by 12%.

In 2008, the domestic rail industry completed Shanghai Metro Line 5 in the form of an energy contract management project for the first time.

In 2008, Longertek culture was born. The core philosophy of Longertek culture is "virtue, benefit, balance and wisdom".

In 2008, Shandong Longertek Technology Co., Ltd. was established, and the joint-stock reform of the company was completed.

In 2005, the first domestic inverter rail vehicle air conditioner was successfully developed and installed.

In 2000, Laiwu Sanhe Technology Company, the predecessor of Longertek company, was established; the first domestic inverter heat pump air conditioner was successfully developed and installed.

In 1999, the first domestic inverter locomotive air conditioner was successfully developed.

In 1989, China's first air-conditioning inverter was developed and completed by Mr. Li Jingmao, Chairman of Longertek.