Can Gree mobile phone air conditioner use no exhaust pipe?

I can't. According to the inquiry of Gree air conditioner official website, Gree mobile phone air conditioner will emit heat while cooling, so it can't be used without installing exhaust duct. Zhuhai Gree Electric Co., Ltd. is an international household appliance enterprise integrating R&D, production, sales and service. It owns three brands: Gree, TOSOT and Jinghong, and mainly deals in household air conditioners, central air conditioners, air energy water heaters, mobile phones, home appliances, refrigerators and other products.