You're all deranged. I run my AC at 72 and my heat at 72. Seventy Two. Se-ven-ta ta.
I don't care if I burn more energy than MoFO trying to get out from under his Mama on a Saturday night floppin tear...72!
ICD...an interesting question you initially posed. I would have said there's no way in hell the kids would be responsible but it appears there are instances where that is the case.
Were I you, I think I would not rely on your powers of foresight and investigate the matter, as it pertains to your part of the world, with a licensed legal authority such as an attorney at law or possibly a Certified Public Accountant.