` How are you measuring your humidity? Specifically, what kind of measuring device do you use, and where in the cage do you measure it?
` I quit using overhead heating sources years ago. Besides the dangerous heat of the units themselves, they lower humidity considerably, and create updrafts. A large snake may live for years with a hot light as in your picture, then one day coil around it, or just touch it with their head. As you know, Boids can stand up to 1/3, or more, their body length. If I can't put my hand on it, and keep it there, it doesn't go in my cages.
` Floor heat has the advantage of using a heat source that is only 70 to 90 degrees, this is much more gentle heat. I use heat tape of varying wattage, depending on position. Under their water, 85 to 90 degrees. Elsewhere, from 70 to 85 degrees. I heat the entire floor, except for one or two safety zones, depending on cage size, and population.
` When you eliminate the need for the snake to thermoregulate, you'll often see behavior that most snake keepers miss. I still keep some babies in cages where they must thermoregulate. Those snakes are tied to their heat source, and it controls their behavior, limiting or eliminating certain behavior.
` My cages all vent some humidity around the doors, but it's not enough to lower ambient humidity. With my main vents all within 6 inches of floor level, I still must use fans to keep it down to 70% to 80%.
` If you aren't using a reliable measuring device, and measuring near the floor level, it's all academic, anyway. Also, with a non-contact IR thermometer, you can pinpoint exactly where heat and thus humidity are escaping. Are the top, and side seams of your cages sealed?
` By the way, you can't beat plain, non-colored newspaper, for substrate.
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