No, Taco ... cold is never a major concern here.
Scott: Not to be contrary, but my only concern with that set up would be the potential for inadequate air flow. With all the other doors shut, you engine could be starved for cooling air. They say heat is a major issue with these lawnmower engines.
If I set up you way, I would consider putting a cage in behind the cab and hanging a radiator cooling fan on the cage to blow across the engine. That way I could crack the front windows and draw some cooling air in from outside. I have long considered that set up on my next rig. If I get a standard Chevrolet van again, I will certainly do that.