No expert on these pythons, but I will add this:

Seems that when you provide a huge outdoor cage and some heating, snakes handle cool temps quite well compared to a small cage indoors and cool temps. I guess their ability to thermoregulate is better enabled in large enclosures.

This isn't to say the idea is foolproof. Take Kelly's advice on those low temps. I would also test during better weather obviously. And make sure they have shade too. Preventing too high of temps in summer is harder to deal with than heating in Winter IMO. Shaded moistened ground is the best way.
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Mark