Shipping Heat Pack Question

So I'm getting ready to ship out my pastel for a breeder loan tomorrow. This is my first package and I'm not sure how many hours the heat pack should be that I put in the box.

Its around 37 degrees low and 61 degrees high in NY and will be arriving in Utah where it is 39 degrees low and 52 degrees high.

Also where/how do you put it in the box. I've watched some videos and looked up some threads already but I want to get an idea of the different ways people do this and why.

I have all my supplies ready except for the heat packs.

Did anyone else battle paranoia like me with the first package shipped process?:oops:

Thank you!

I tape mine to the bottom of the box, under the newspaper and on top of the styrofoam. I use thirty hour heat packs.

I like to use 40 hour heat packs, just in case, but in spring and fall sometimes I use the 12 hour ones...they will work overnight, then cool when the day starts to get warm. When it's too cool both night and day, I want a heat pack that will keep working if there's a delay in the shipment.

I usually tape them to the styrofoam panel that fits on top, on one side, or to the inside of one of the side panels. I don't like to put them underneath, as I worry about too much heat on one spot overheating the snake--the heat packs can sometimes get over 100 F.
It's important to have a couple of ventilation holes when using them, as they do use up some oxygen. How many packs you use depends on the outside temperatures, and on how big the box is.

They aren't very expensive, so consider testing the boxes you use with heat packs and a high/low recording thermometer to see how hot they get inside when you leave them outdoors overnight, and determine how many you should be using.

Remember that if anyone READS the warnings you put on the box, it may not spend a very long time exposed to the low temperatures outside, so it should be able to have safe temperatures inside at room temp as well.

I have the extra boxes and thermometers so I'm going to do a test box overnight. Thanks for the idea.