I did a little test on my front porch when it was 16 F outside. I took a very nice pro pak styro box (VPI uses these) and put 2 heat paks in the box. I had a thermostat probe in the middle of the box as well. Sealed it all up nice and tight inside my house and put it on the porch for 10 hrs. The temp of the inside got as low as 40 f. I then did the same test and just let the box sit in my house all day (house temp 70 F). The internal temp in the box never went over 80 f. I think in cold weather it is almost impossible to kill the animal with heat. I agree if the anumal is delivered as planned overnight in a well insulated box, no harm will come to the animal. What iif the animal becomes lost (hopefully never) and the temps drop to below 25 f ? A 40hr heat pack could save you $$$ in refunds to your customer. My opinion is you dont need a heat source in 40F and up. Either way I guess Im too paranoid. The box that I used , would be big enough for an adult boa to be shipped.

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