Hi Joe, I think your overthinking. I also live in a hot area. I use no cooling, never have. And they all breed(I am having a nightmare) they never stop. Snakes, turtles, torts, monitors, someone stop them, awwwwwwwwwwwwww Actually when I lived in apartments on the higher floors, I had to cool them to get down to 65F
Consider, the snakes outside your door are in texas and they do not need cooling chips or ice packs. Then consider, milksnakes in central america breed in the same conditions as milksnakes from Kansas.
In an earlier post, someone mentioned Ron Savage. I loved how he bred snakes. He caught them, put them in cages in his house and garage, then went to mexico in the summer and the snakes bred all by themselves, no heating or extra cooling. KISS, I think he fed them in the fall, but am not sure.hahahahahaha And those that did not die or get away, bred and produced just fine. I lived across the street, so I know some got away, hehehehehehehehe.
Hmmmmmm I practice that approach these days.
Put them in a room open a window, close the heater duct, and your done. What they do in nature is seek out a large mass so the temps do not wildly jump up and down. Some pick areas they can warm up if they want to. You know, warm up to 60's or 70's.
Not to burst your montane bubble, but snakes in our montane field study has shown they do not need to hibernate and are often out and feeding/breeding all or nearly all winter, our site is 6000ft, plus and minus. Put it this way, we have seen gravid snakes every month of the year.
What seems to be important is, reproductive snakes require a range of temps. In order to reproduce, they also need to have the ability to conserve energy as well as expend it.
My personal opinion is, snakes seek out temps about 65F year around. That is, if they do not have food in their stomachs or are in shed or sick or wounded. that is, if there is no need to up the metobolism, they seek 65F or so. And that includes pythons. Of course 55F does not harm them. Temps lower then that are not needed. You can think of it like this. You know, there is no need for temps above 100F in their cages. But you could include temps above 100F they just will not use them. Same goes for temps below 55-65F. If you give them a choice, they will pick that range. Then move up if needed. Cheers