Teddy Roosevelt
i loev cronsankes
Corn snakes need belly heat, end of discussion. Unless you're using paper towel for substrate, your heat lamp probably wont make the bottom of the tank warm enough, and if it does it's probably making the ambient air too hot. Do what you want to do with your animal.I don't think I've found a single care sheet yet that specifically advises against heat lamps. Here's just one example from kingsnake.com, written by Peter Spiess: http://www.kingsnake.com/rockymountain/RMHPages/RMHnewpage11.htm
"Appropriate Heating
There are several choices for appropriate corn snake heating. Whatever choice of heating is used, it is very important to provide one area of the cage where the ambient (air) temperature is 80-85 degrees F. Corn snakes, like all reptiles, do not make their own body heat and rely on a behavioral mechanism called thermoregualtion to regulate their body temperature. Thermoregulation means that when a reptile is too cool, it moves to an area to warm itself, and when it is too hot, it moves to a cooler area. Access to warm areas are critically important to the health of your snake. Appropriate heating is required for proper digestion and the effective functioning of the immune system.
If the tank has a screen top, a shop light or metal reflector may be placed on top of the cage, to one side, with a heating bulb inside to create a basking area of 80-85 degrees F. Another method of heating is the use of quality undertank heating pads. Undertank heaters are plastic with one adhesive side. The adhesive side of the heater is used to attach it to the bottom of the outside of the tank, on one side of the cage. These heaters can only be used with certain types of cages, so check the directions before purchase. Hot rocks are not recommended for corn snake heating for several reasons."
I can post excerpts from caresheets all day long saying that heat lamps are perfectly acceptable as heating sources for corn snakes. EVERY rat, corn or king/milk snake book that I own also recommend heat lamps, just as well as under tank heaters. I would understand some of the venom being thrown at me if these same book/caresheets advise AGAINST heat lamps but they don't. So yeah, I still believe it comes down to preference. If the corn snake has a way to warm itself, why does it matter how it is achieved?
What's interesting is none of you would recommend heat rocks, and IMO rightly so. However, what would be the harm if they are used with a dimmer or thermostat? If it's okay for undertank heaters, why not for heat rocks?
And just to set the record straight, I do use undertank heaters for some of my snakes, including my amel corn snake and ball python, only because my house stays on the cool side because of the AC. But as I mentioned earlier, I don't believe both are necessary in most situations and if I would have to recommend one over the other, I will recommend lamps.
Heat rocks are faulty for a number of reasons, which adding a rheostat cannot fix. The plastic covering is not always evenly distributed, causing some areas to be cool and others to be very hot, snakes can squirm underneath them and be burned, etc. If you wish to use heat lamps or god forbid heat rocks for your animals, I can't stop you. Just know that just because snakes can show obvious signs of discomfort doesn't mean they enjoy the conditions you provide.