How to heat this cage????

[AnniesMom]

I use mine when I have to take the snakes anywhere in their portable cages. I think to use for regular use, just put it under the cage, making sure that the cage is off the ground a bit so that there is airflow. The one that I bought is a wet/dry pad, so I could put it in the cage under substrate, as long as the heat was regulated by a thermostat