Which factory in China is more reliable for producing and manufacturing petrochemical air coolers?

Harbin Air Conditioning Co. Gansu Lanke Petrochemical Hi-Tech Equipment Co. Shandong Meiling Chemical Equipment Co. Lanzhou Changzheng Machinery Co. Hubei Changjiang Petrochemical Equipment Co!

Mainly depends on your own strength, if it is a high-end user of the above company is your best choice, if you are a low-end user of air cooler small manufacturers are too many, if you have any questions you can keep in touch!