Sometimes you just have to laugh. I found a website for a company that sells steel buildings. Usually these types of things are used for storage of large equipment. Cars, planes, boats, etc. Scrolling through the pictures of things the company believes their structures could be used for, I came across pictures of classrooms and workshops where there's an adult teaching quite a few kids. Why did it make me laugh? Mostly because I can't imagine that heating or air conditioning would work very well in a steel building. So it would be freezing cold in the winter and unbearably hot in the summer. These types of buildings are used for storage because equipment can usually handle temperatures that the human body cannot.
Then again, maybe there some trick to these buildings that I don't know about.