This hotel has only heating, but no air conditioning.

Generally, large regular hotels have two modes of cooling and heating. The central air conditioning of the hotel is controlled by the computer room, and all cold air or heating flows through the pipes at both ends. Unlike home computers, this is not a cooling and heating mode that the terminal can control. Because the central air conditioning hosts are large machines, each unit needs to provide air conditioning or heating for many fan coils. Because most air-conditioning fans are transported by water cooling, it is only necessary to set an electromagnetic valve in the room to control whether the water for transporting cold air or heating flows through the fan coil of the indoor unit. So if there is no air conditioning, you can report the situation to the hotel front desk.