IDK. Having worked in a couple of different factories you would have to see exactly what they are talking about. I think it would be difficult or impossible to have climate control in a casting facility. Offices, break rooms, locker rooms, etc is different. The aluminum extruder i worked for had ducted a/c for operators in particularly hot areas during the summer heat. It blew on you at your station. I worked at a can plant in Youngstown that had no HVAC on the plant floor. Hot in the summer and the ovens kept it bareable in the winter. Dress accordingly.