From my personal experience, and also a friend of mine that is a breeder of 1000's of corns and 1000's of retics for over 30 years, you really do not need much to house corns...Heat is not an issue if you can keep the room in the 70's, through say a space heater in the winter here in Ohio...A snake will be more active with a heat gradient of course, but I am personally into more snakes, than one active snake, especially when corns are native right up to the ohio border, which isn't nearly 70 always...I held corns in tanks for a short while, 10 gallon with a laminated board as a lid ($12.00) with usually only substrate, and water dish, since hatchlings will just hide under the water dish...I now take the extremely economic route of housing in plastic containers of roughly the size of a 10 gallon, just without the height, for a mere $5.00...it doesn't hurt to spend a few dollars and put some driftwood for the snake to get off the ground...all in all, as long as you feed the corn correctly, not too big mostly, the heat is not an issue for digesting properly, which heat is obviously the biggest cost, with a heat pad, and thermometor...if you really want heat, wire up some flexwatt and wire a cheap dimmer to it...hope this can help you house more snakes, and for about $10 a setup...