Nearly every chest freezer that I've looked at, and I assume that is what you are talking about using for a freezer, has the coils right under the outside skin of the freezer, so the outside of it is warm, I have mine sitting in the corner of my living room right now and it helps keep the living room warm because of the slight heat it gives off, same reason the kitchen is always 2 degrees warmer then the rest of the house from the fridge running and I've put the kill-a-watt meter on both appliances and they are both pretty efficient.
To thermally isolate the root ceiler from the rest of the house you just want a good R-value in the wall that is separating the two, insulation is going to work better then dirt or cement, if you are worried about cold creeping from one slab to the other slab then insulate it, insulate it just like you would under the slab and outside of your poured concrete walls.
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