Window air conditioner is a built-in unit that contains both evaporator and compressor with condenser. It is installed in an aperture of window or wall hole in such a way that its outer part is in contact with the atmosphere, and the inner part with evaporator is inside the room. Naturally, there are two fans: the first one blows the condenser, and the second one drives air through the cooled evaporator inside the room.
The main advantage of this type of conditioning is that all electrical connections and piping are located inside the unit. For installation it will be sufficient to fix the conditioner and connect its power cord to a wall outlet. No specific equipment is necessary.