[reno911]

I have no clue, but to add to your first statement. I think you meant to say that the more efficient motors run cooler.

I can imagine there are certain temperatures that may allow current to move through something a bit better. Then again I am no electrician.

From a physics stand point, which I understand slightly better than electronics, I would say colder the better. The closer the molecules are together the less resistance. At least that makes some sense in my eyes.