I remember reading a few decades ago on how some farmers had built barns specifically so they could dry out bales for those days where the farmer has to bale hay that is not totally dried out before baling.
I think these barns had their own heaters and fans. It sounded like a wonderful idea to me living in the often rainy southeast. Sorry, I can’t remember the book, I think it was a library book in the agricultural section, possibly dealing with pastures for cattle.