I hear that most dry-climate folks prefer coco fiber (eco earth, reptile prime, etc.), coco chips (like reptichip), or a mix of both or one or the other with sphagnum moss.
All of those take misting just fine and would take a lot to mold, unlike aspen. It will be something to experiment with, buy 2 or 3 possible options in small bags and set up the cage for a few weeks before getting the snake. Try out each one for a week or so and see how it performs.
In your climate, I'd advise against aspen.. I could get away with it in mine, but I have quite a few aquariums in the house that boost my household humidity higher than most in my area have it and makes it less necessary. I just use fully dry coco products for the aesthetic rather than for humidity.
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Thanks! I do have a co-worker that has expressed the mold concern so I think I will stay away from this substrate when experimenting. I also like the aesthetics of the coconut stuff! This is what I'll likely start with.