Ask people who deal with you give you email about their company business registration certificate,or tax certificate. Since any company which registered in China must have these certificates, which are usually issued by the industrial and commercial bureau of local government. Of course these certificates are in Chinese, if you don’t understand Chinese, tell your supplier you have Chinese staff (or friend) who will verify according to these documents, then nobody dare to cheat you any more, I think. Per these certificate you can detect whether the company is manufacturer or trading company. I know most heat pump clients don’t want to deal with trading company. After heat pump selling, trading company can’t provide technical support in time. What’s more, some trading company may source from different factory, which also will lead to the products lack of quality control.
Check whether the supplier have attend exhibition or not? Except internet, International Heat pump related Exhibition is also a good way to find a qualified heat pump supplier. To a certain extent, I think exhibition is still a reliable source for find qualified supplier.
Remark：
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