Job at hand but I start with a 12 x 9 x 6 box for one or two baby Boas and one up to 2.5 feet and move up in box size with snake size but I also run tests on my boxes with different numbers of heat and cool packs to get as close to 75 to 80 degrees by setting up a box and leaving it in my truck in the cold of the night or the heat of the day with a battery operated temp gage for up to 12 hours and checked many times to see were the temp is to see if I need to adjust the number of pack to achieve my temps and this changes with the different size boxes and it has worked great for me as all my customer have all told me that the snakes have arrived in great shape and some have confirmed the temps that I like to achieve so I would recommend that you do the work and test your set ups for all the boxes you might use because the cost of these tests are cheaper that the loss of any animal good luck Scott Mid Atlantic Morphs

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