Random Worldbuilding Questions (Biology, Geography, Society, etc.)

[Ksheep]

We are already. When we're warm blood vessels expand (or even open up) in out entire skin, with an extra density in head, arms and feet. We then use the sweat to cool the skin off. But the primary heat regulator is, like with all mammals, the blood.

Well, as lunar was asking for some way of heat regulation without sweating, the simplest answer is to radiate the heat away by passing more blood through the extremities.