Why is the Northern Hotel not cold in winter?

There is air conditioning or heating. Northern hotels are not cold in winter because the air conditioning or heating of each hotel will be turned on normally in the heating season in the north, so it will not be cold. The hot water or steam discharged from the boiler enters the radiator (commonly known as radiator) in the building through the pipeline, and the room temperature is raised after heat dissipation. Hot water or steam in the pipeline is called heating.