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For a simple single-speed cooling-only split DX system, ZoneHVAC:WindowAirConditioner should work fine. Just be sure to set the nominal performance to be appropriate for the system type. The split system is likely to have higher supply fan pressure and different cooling COP. Other options that would also work are ZoneHVAC:PackagedTerminalAirConditioner (PTAC) and AirloopHVAC:UnitarySystem.