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From this link.I haven't used heat tapes for years. Not since I moved down to Florida, anyway. But when I lived in Maryland I used them quite frequently.
I had to use three different heat tapes, each one on it's own thermostat and rheostat (dimmer).
That broke up the rack vertically into three separate regions, each with it's own control. Otherwise... it was pretty darn difficult to keep a uniform temperature top to bottom on a rack.
One alternative to using multiple tapes is to circulate the air in the area where the rack sits. Remember that the ambient temperature of the air itself will be warmer near the ceiling than it is near the floor, so if you use a moderately sized fan sitting on the floor and pointing upwards, this will help to equalize the temperatures in the room. The warmer the air is around the heat tapes, the warmer the total temperature will be within the cage.
Not that I am in Florida and only working with a single species of snake (Corn Snakes, of course!), I just control the temperatures in the rooms themselves and do not do anything else for temperature moderation.
Each room has it's own combination air cleaner and circulator that draws air in at floor level and blows it up towards the ceiling.
There is still a slight difference in temps from top to bottom of the racks, but I use this to advantage by moving the snakes themselves to the level that they seem to prefer.
Remember that they are all individuals and some will be more comfortable than others at a particular temperarture.
Kind of like my wife and I being in the same room and she'll feel cold and I will feel too hot. This goes for animals as well. So if an animal seems uncomfortable, move the cage to a different spot and see if that is more to it's liking.
Another thing: Minimum/maximum thermometers are invaluable! unless you want to physically monitor the temperatures at a given spot at 3 am, use these to tell you how low it actually got during the wee morning hours, and how high the temps got during the day.
Also, the new temperature sensor guns are worth their weight in gold, so buy one when you get the chance. You'll wonder how you ever lived without one before.
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Rich Z