①   It is equipped with ventilation system. If an AC in the application scenario, it is generally not necessary to install AC.②   AC can be installed, we also have a special customized AC (installed on the top of the cabin)is with no drainage, cold and warm dual-use, negative ion air purification, noise reduction function of the all-in-one machine.③    Conventional AC can also be installed, but a cold pipe hole is reserved in the acoustic phone booth.