Cooling off when hot, or warming up when cold, which is achievable quicker and more effectively accomplished?

When the temperature rise above 99 deg. Fahr or dip below 40 deg. which is easier to accomplish and still leave you functional? What are the pros and cons to both, for instance, you can cool off quick when the temps hit 101 by jumping in a pool, but now you are wet, and confined to just the area of the pool, or you can put on more socks when the temps dip to 40 or below, but certain shoes may not fit anymore, and it will still take time for your toes to thaw out. Warming up is from the position you are already cold, and cooling off is from the position you are already hot and maybe sweaty.