Ebay Find 1989 Ford E-Series Van E350 DUALLY 4X4 17k miles

I am confused about the heater on this thing.

"The AC/Heat in rear is more than enough for the 6'6"tall X 7'6"wide X 11'6" long living quarters & is a commercial grade Duo-Therm unit powered by compressor on engine."

What exactly does that mean? Anyone have a link to something similar to understand operation. So no heat or cooling unless the motor is running?
 

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