Big John, the TK is pretty much stand alone. It has its own A/C, but it uses a few OEM/factory ducts as plumbing, in addition to its own. While it does use an inverter via the batteries, it still doesn't need the engine.
Now, I said "pretty much" stand alone. Mine has the artic package where the coolant is also heated by the generator (apu) for cold weather, but still utilizes a built in radiator.
Either way, the control panel is pretty simple on the TK, but this thread isn't about how EZ the panel is on TK