Mr Sodenberg,
You mentioned when the house might be too warm, but when is the house too cold. Personally, I don't keep my house at 75. My vaulted ceilings would make my heating bill rocket out of this world.
As it is I only have four snakes, although got my first one six years ago. My female is almost always in her hanging hide (probably should put a thermometer up high in her tank), the older male is stretched out over both ends of the tank, the little anery mot is almost always on the warm side (but seldoms burrows) and the new one I haven't had long enough to see a preference.
I'm glad you brought this up. What you're seeing is possibly the crux of the temperature issue with corns. If there was a ranking of the most crucial tool in snake husbandry, it would be the
thermometer. A good one! Having said that, you should never completely trust a thermometer. Frequently put it next to a dependable thermometer (usually the one on the thermostat of your home HVAC) OR have two thermometers from which comparisons can be monitored. So, here it comes; the biggest pearl of wisdom I have to offer the corn snake hobbyist.
If you presume that the warm end of your cage is warm enough, and that the cool end is not too warm, and that your snake will utilize those temperate zones, you're only partially prudent. First, if corns do not feel comfortable in either of the hides, they may not use them. If the opening to your hide is too large (allowing too much light to penetrate the hide), it may not stay there. Second, if the warm-side hide is too warm, your corn will go to the cool side. They know they can tolerate inferior temperatures, but also know they will die from excessively high temperatures. Hence, when it's too warm, they retreat to the cool side of the cage and either never get an appetite OR are rendered incapable of digestion. It sounds to me as though your snake is staying in the hanging hide because it's too warm (or not dark enough) in properly warm zones on the floor of the cage. Without a way to check temperatures INSIDE those hides, you won't discover why it's staying in the hanging hide.
The answer to your question is, "I can't imagine a home that is comfortable for humans being too cool for a corn snake (as long as properly dark hides have temperatures conducive to the thermal regulation practiced by corns for digestion)". In other words, your home can be 60F and be safe for your corn snake as long as you offer hides that are conducive to digestion.
If the three most essential prerequisites for success in retail business are:
location, location, location, then surely, for corns, they would be:
temperature, temperature, temperature. We all knew this, but what sets the successful corn snake keeper apart from others is how and where he/she satisfies those requirements. I have told many customers that I don't care if they use candles or thermo-nuclear devices, as long as they achieve 79-85F in one hide and below 80F in another (please, do not use candles). Honestly, except for feeding mistakes, I don't see how a snake keeper could have any problems with a corn snake if they remember who's the boss. THE SNAKE is, but since it can't
tell us what it wants, we must put the THERMOMETER where it is needed. This would not be on one of the walls of the cage. In my next book, I'm showing the best placement of non-electronic thermometers is to be attached to the
inside wall or ceiling of the warm-side hide. Honestly, no other location in the cage is important (unless it's too warm elsewhere).
Some of you will grin because you've heard me say this on the phone. When asked by anyone
what temperature a corn snake's cage should be, I say, "I don't care". As shocking as it is, I say this for one important reason. We really don't care what temperature the cage is in places where the snake can't hide. We really are only interested in the temperature of the snake's body, so nowhere in the cage is the temperature important to monitor other than the warm-side hide (unless it's warmer outside that hide). This is because that is where your snake should spend most of its captive life. Hence, if your thermometer is on the back glass of the aquarium, where your snake will never be, why do you care what it reads? It's useless there.