demeus wrote:
Just to give you an idea, the Mall of America in Minneapolis has no heating system what so ever and the lowest the temperature gets in there is 65 degrees on the morning after Christmas when the mall has been closed for almost 48 hours.
Not entirely correct. You can't have a building in Minnesota with no heat. California or Florida yes, but Minnesota, no. The stores in the mall have heat, and the entrances and ground level areas have heat. Thats pretty standard. I don't think it would even be possible to heat large common areas in a building like that, and it certainly would not be necessary. As long as cold air doesn't get in and heat doesn't escape, it will stay warm.