Maybe it was myth, but during a tour of one aging warehouse, they talked about the weather's impact on the aging process -- temperature and airflow were factors

Maybe it was myth, but during a tour of one aging warehouse, they talked about the weather's impact on the aging process -- temperature and airflow were factors. These warehouses were basically large wooden barns with upgraded structural components. I think it would basically require a completely new structure to get any level of airtightness for many of these. And then some degree of study regarding the impact of these changed conditions on the aging process. Still doable of course, but I don't think it's accurate to call it not "not that hard".