Something to keep in mind on the cage vs. rack video is that the creator of the vid is also trying to sell cages, and is presenting a biased perspective (he doesn't build racks). Both racks and cages can be the right solution for bloods/STPs in a given situation, provided that the rack or cage appropriately meets the needs of the snake.
We have successfully bred bloods & STPs in both over the years, but ultimately find that our snakes are "happier" in rack systems. They are calmer, less flighty, less likely to meet us with a feeding response, and generally more predictable than when they were housed in cages. When they were in glass-fronted cages, they spent most of their time sitting under layers of paper. In the racks, they still have paper available under which to hide, but this behavior seems to be more the exception than the rule that it was in the cages.
I realize this deviates a bit from the original temperature question, so I'll also note that our snake rooms are calibrated to 80-82 degrees on average, and most of our animals do not receive supplemental heat. Those that do receive supplemental heat have radiant side heat creating a warm spot of 86-88 degrees.
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