How to use air conditioning in old hotels?

Window air conditioner, which combines indoor unit and outdoor unit, has ventilation function. Installed on the window, one end is outdoors (air intake and air conditioning exhaust), and the other end with knob faces indoors (air conditioning blowing). Just plug it in.

Air conditioning is air conditioning. Refers to the equipment that manually adjusts and controls the temperature, humidity, flow rate and other parameters of ambient air in buildings or structures.