...your heat mat is exactly what you need. Don't be concerned with the air temp. Heat mats, or under-tank heaters, are designed to heat the substrate in a localized area in order to provide a warm surface for your snake to use when needed that they can easily move away from. This is what they need as opposed to a warm air environment that they can't escape. Their bodies are in constant contact with surface temps, which is a more efficient means of thermoregulation, they can easily move to a cooler surface when they no longer need the heat, and they will need a significantly cooler area to use. Being that your kingsnake will need to be able to move away from that heat when it isn't needed and retreat to a cooler surface area of the tank, be sure to position that heat mat on one end of the tank and provide hiding places on both warm and cool ends.
If you use lighting, be sure it is relatively low wattage or use it with a dimmer, and use a standard incandescent type that is not a basking or spot lamp that will heat up an area. Kingsnakes don't need to bask in warm light unless that is their only source of heat to use. Position your lighting somewhat away from the cool end, even standard incandescent type bulbs generate heat and you don't want to heat up the cool end of things too much if you can avoid it.
So, your heat mat will do the job just right... bring that awesome kingsnake home TOMORROW!!!
Mike


