I just did this not too long ago in northern Ohio. I actually made a dual shoe box kit with one of my empty shoe boxes and one of my daughters shoe boxes inside with a layer of crunched up newspaper between them. I placed hand heater pads from walmart next to the inner shoe box and then used a digital thermo probe so I could moniter the temps. It kept it around 84 where the snake was for the trip. I did notice a temp drop after a few minutes while sitting on top of my cold books so pre heating the car may help. Good luck and look forward to hearing what you do and how it worked.
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