Hi, Mrs Zahra, could you tell where are you going to visit in China? Generally, the heating system is provided in north area of the country, While in south part, such as Shanghai, there is no heating system provided by the local government. They use air conditioner. If the hotel is not very simple and humble, there will be air conditioner in rooms. Most rooms will be equipped with Central air contitioner system. You can ask for changing another room if the one is not warm enough.