Here is my tank (again i'll get a pic when wife gets home) its a 40 breeder:
1 1 2
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1 = florescent lights on timer, just for my viewing
2 = red 60 watt reptile night light
3 = UTH
4 = digital thermometers
5 = thermostat probe
6 = water bowl just large enough for the snake to soak in
7 = hides
Left side stays at low 70's and right side stays at 86.
On/off thermostat with/without dimmer:
Without:
Thermostat kicks on the heat pad when temp at top level of substrate reaches 83. Heat pad, and glass heat up to 110
which may be ok with some people, but i dont like it. After
a while, when the top of the substrate heats up to 86, the heat pad kicks off.
With:
Thermostat kicks on the heat pad when temp at top level of
substrate reaches 83. Heat pad and glass heat up to 90. After
a while the substrate reaches 86 and the heat pad kicks off. The dimmer serves to keep the heat pad from ever getting above 90.
Heat Lamp:
I use the heat lamp for 3 reasons. First, its the best way i could find to get my humidity down to 50. Second, I like to see my snakes at night, and don't want to have to adjust anything to do so. Third, I prefer the air temp and the substrate temp to be balanced.
By leaving the red light always on, having the flourecents cycle on and off for daytime, and using the UTH on the thermostat/dimmer, i keep my temperatures constant, am always able to view my snake, and he gets the most comfortable environment i can provide. Night temps drop on the cold side to 68 but still stay warm on the warm side.
I don't closely monitor humidity for each tank, I have one humidity sensor that i stick in each tank and move around randomly to spot check them, but here, i'll never get it low enough to hurt them, i only have to make sure it doesn't get too high.
My snakes use their entire cages from floor to ceiling and from left to right wall. They climb around on the top rim of the tank, they use both hides, they are healthy and active, eat very well, and are never aggressive.
If you want specific details on the process i go through to set it up, i can provide them, its quite simple.