Originally Posted by Edumakated

Amps are what create the heat in the ESC. When we use higher voltage, the less amps are needed to create the needed power, so the ESC runs cooler. The same is also true of the batteries. The higher voltage setups are easier on the batteries which is why you can get away with running lower C rated packs because the battery doesn't have to work as hard to supply the needed amps (which is why higher voltage setups use packs with less overall Mah for the same run time).

In my experience, I haven't noticed a significant differnet motor temps regardless of the setups and I have raced everything from 3s to 6s. What creates temps more than anything is ensuring the motors have enough torque. This is why the four pole motors such as Neu, Castle, Tekin, adn Xerun run cooler than the two pole motors from Novak, LRP, etc.