What do you guys think about this?
Heat pads and "Hot Rocks" should be avoided since all reptiles have a Preferred Optimum Temperature Zone (POTZ). In order for a reptile to reach its POTZ it must be 10 degrees F. above the ambient temperature this can not be accomplished by lying on a hot object. If the snake lies on a heat pad it can only get as hot as the pad. It is impossible for the snake to raise its temperature to 10 degrees above the object that it is laying on.
I found this on a ball python site. Now I know "hot rocks" are bad, but everyone knows that one of the best methods of heating a cage is with a heat pad! Also could someone elaborate a little more on (POTZ), because I don't know what they are trying to say, that you can't use a heat pad to get the belly heat temp 10 degrees F higher than the ambient air!! What do you think?