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I am confused. Is it within code to use the same heat source and add an additional zone. If you were using a hot water boiler at which point it would mix with the same water that is heating the house. If you are using forced air I could see the point of not wanting a cold air return. As an example at some point the air would have to circulate back through the system may pull exhaust fumes back into the house. Those fumes would then be distributed back into the living space. If the garage heat has to be "separate" you would have to use two separate heat sources. If that is the case I would just put in electric base board unless money is no object. Then I would build a 8 car garage with its own heating system, hydro-thermal for sure. That way when I lay on the floor to detail the underside of my NSX the floor would be nice and toasty.