Yup makes sense! Either they just needed heat, cuz like you said the AC was on, or the heat overwhelmed any fears of the substrate, and settled them down. If they're sending out foragers, then that's good! Likely they've settled in and the queen is brood-making, and hungry for food. Nice!
So I put a little heater on one side of the sand nest... and... it worked? They are underground and even have a few foragers out. I don't know if I've totally calmed them... poor nervous girls.
I'm going to leave them alone as much as I can and hope that they don't abandon their nest again.
(I have had the AC on so maybe they feel like they aren't in a proper summer.)
The sand is the same sand I use for all my other ants. My Pogonomyrmex dug this kind of sand in a similar set up with no issues. I don't think it's the sand, but this heat thing could be a factor.
I've noted when my ants needed heat, they would always pile all the cocoons toward the light source thinking its sunlight lol
I mean it's likely that the light does provide a tiny bit of heat, so yes, they would think it helped! Funny how ants do that haha.
Currently raising:
Manica invidia (1 queen + ~30 workers)
Manica invidia (3 colonies, 3 queens plus brood)
Lasius niger (single queen + ~200+ workers)
Lasius americanus (3 colonies, ~5 workers p/colony)
Tetramorium immigrans (1 queen + ~1200 workers)
Tetramorium immigrans (3 colonies, 3 queens)
"I discovered that if one looks a little closer at this beautiful world, there are always red ants underneath."
- David Lynch