You have to understand aswell, snakes are cold blooded, they 90% of the time will feel cool to the touch, they thermoregulate as needed, 70 is cool yes, but its not the end of the world, as i said dont expect to pick up your snake and have him feel warm, unless you came out from a cold winter day, the palm of your hand is often 90+ degrees especially after being active, which most snakes hot spot is 88-90 (meaning hell feel neutral if at all never warm)