Yes, all units have this feature.
Not applicable as there is no efficiency rating standard for portable air conditioners.
Yes, all the portable MovinCool units can operate on a 50Hz cycle with a slight performance decrease from the specs listed.
The nozzles come one per box. You need to order two if you need two nozzles.
For 115V portable units, 20 feet. For 230V portable units, 17 feet. The head pressure will go down with the voltage draw by the unit.