I drop my female down like that.....down to the mid 70's and never seen it.
I always pull the eggs but, as long as you don't wash the female or the egg container.....the female will continue to "incubate" the "eggs"....full term...to the day.
After day 65....their whole program changes.

I've done many experiments with Aspidities based around learning their incubation habits because, I'm very interested in this function of snakes.
My room is an ambient 74 degrees all the time.
During the day...the cage has heat in form of a panel or light, and the cage will get 88.
At night....everything goes off in the adult cages and the temps drop to 74 or so.
I do this to imitate natural environment fluctuation.....even at those temps....down to the low 70's sometimes....and, they don't thermal regulate.
My carpets will thermal regulate at 88 degrees.Haha.
I've even watched BHPs females.... stay off the eggs for a few days and return to "protecting" them.
Like I said...they can fool you though.
Also, a friend of mine in Australia has watch wild females lay and leave the eggs (like a corn snake) only to come back to "check" in on them later. She never left the area and she only sat on them about 20% of the time.
Black Head are wild animals. Haha.

Cheers,
D.

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