I may be wrong but all the ducted systems I have seen use a wall thermostat and cycle the unit off and on like a home unit. The non-ducted units don't have this feature, they have a fan speed which doesn't cut off and a temp control from 0-10 which cycles the compressor. Fan runs all the time.
The newer non ducted units may be different but that's my experience. I wouldn't have anything but ducted air.
Clif and Millie
Ozzie (half a dog tall & 2 dogs long)
2009 Ford Lariat F350 SRW CC Diesel
2013 Cruiser CF305SK Patriot Edition