I have a small seedling starter heating mat and the same brand thermostat (Hydrofarm Jump Start). They claim to be the only UL-certified brand, and after reading all the Amazon comments about reptile heating cables bursting into flame, I went with that (though I do have a reptile heating cable too).
I keep it under 1/2 to 2/3 of the mini-hearth.
And yes, I founded Pogonomyrmex subnits in mini-hearths. I got two polygynous sets from Sleepy, one earlier in the year, the other later. iirc the queens had a roughly 30% mortality rate (contrast to my Veromessor pergandei mortality rate of 50% or my horrendous M. mexicanus 90% ... it could be I just suck). At this point the remaining 5 queens (3 and 2) colonies are doing well. The 2 queen colony is still being heated because they were so far behind. The 3 queen colony is getting low heat over winter because the mini-hearth is getting crowded AND not only that but they made the glass so disgusting I can't see inside. I've ordered a Fallen Fortress for the dirty Pogonomyrmex - supposed to be good for visibility since they can't climb on ceiling glass and soil it.
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Ants_Dakota and Swirlysnowflake like this
Past & Present
Veromessor pergandei, andrei, stoddardi; Novomessor cockerelli
Camponotus fragilis, Camponotus sansabeanus (inactive), vicinus, laevigatus/quercicola, CA02
Pogonomyrmex subnitidus, P. californicus (inactive)
Liometopum occidentale (inactive); Prenolepis imparis; Myrmecocystus mexicanus (inactive); Tetramorium sp. (inactive); Lasius sp.
Termites: Zootermopsis angusticollis, and a box of drywood termites that can't be seen
Isopods: (most no longer keeping) A. gestroi, granulatum, kluugi, maculatum, vulgare; C. murina; P. hoffmannseggi, P. haasi, P. ornatus; V. parvus, P. pruinosus, T. tomentosa
Spoods: (no longer keeping) Phidippus sp., other