I wondered about making a more "natural" AC than using the condensation / evaporation chamber. You can just use, like, a cave, sure? Well, the one I dug leaked despite seeming filled in. Later quarrying suggested it was leaking through a weak wall into another cave. Natural ground is just too unreliable, I guess. So I built this one above ground. The walls are only 1 thick and I don't think they're going to explode. The size is greatly excessive (Sorry for the night photo; even during the day Janus is stuck behind a building.) But the season is otherwise fortunate because I need long nights to get it filled. Probably I will not be able to fill it all the way; the input will start condensing in the gas pipe & blow it up. But as it fills up the gas line will probably get condensation & explode & dump everything. I foresee numerous other problems...