(I'm trying to figure on emergency supplies for a Jackson a Panther and a bearded dragon) I think 100 would be way too hot for the Jackson- they are supposed to get to that temp and then cool down so the plan would be to use it for the beardy and then switch it when it starts loosing heat.
I've bred all these species and have a group of bearded dragons that goes back 20 years in my care.
Your panther is the one that needs heat. Surprisingly perhaps- but moreso than your bearded dragon. Short term down to 50 is OK for the panther, but he'll need to warm up some in the day time.
Bearded dragons and Jacksons can both go down pretty close to frost without harm as long as it is short term. I use 40 as a cutoff before I bring both species indoors. The dragons are more cold hardy in some ways because they truly brumate and go dormant and sleep. I've done quite a bit of personal investigation with a large group of bearded dragons this past decade about hibernation, working out how to keep them down all winter here (7 months) when I want and working out how to bring them into hibernation naturally outdoors before bringing them in and how long to leave them outside. I can tell you with a lot of confidence that if you put them in a cooler and the temp in the cooler doesn't drop below freezing, they should be fine short term. After several days, my concern would more be about food rotting in their cold guts than it would be about cool temperatures as long as the temps are around 50-60 degrees days, no lower than 40 nights. At temps in the upper 60s and above, the dragons should be able to clear their guts if they need to.
Jacksons on the other hand, are OK down near freezing short term but need to warm up some (50s and 60s short term for a few days is OK).
If the power outage lasts longer than the storm clouds- there is nothing so nice for lizards as south facing windows to warm up- especially bay windows. Many winter days when the sun is low on the horizon and shining in through the windows, our house iguana Norma is very hot to the touch just by using the sunlight in the bay window without another heat source. By enclosing a bay window mostly with something like pastic and tape (syran wrap? Garbage bags?) you can make a solar heat collector where you can put your lizards during the day time to warm up. By adjusting the airflow more and less with the plastic, you can control the temperature some.
You could put the lizards in coolers at night and hopefully keep temps above 50 at night and warm up in the window days.
Just some thoughts...
The nest thermostats are quite expensive for some people.
Thanks for the tips guys on the nest thermostats. Believe me the cost is much less expensive than replacing years and years of cages, lights, feeder insect colonies that pumped out enough to feed 10,000 insects per day when needed and ripping the building down to the studs, cleaning the studs, and rebuilding. I couldn't afford a contractor so I've had to do it all myself and it's still been expensive and discouraging. Some of the lizards were unique and no money can replace them. $200-$400 is cheap insurance compared to a lizard building or a home... I cannot imagine how hard this would have been if it had happened in my house.
