Schools heating systems struggle to keep up, especially older buildings. back a couple years ago when we had a "polar Vortex", we had a call at one of schools. It was an issue related to the heating system. The head maint. guy told me after temps reach a certain point, it was outrageous how much it cost to heat for one day. I don't remember the $$ number, but it was crazy. as a tax payer i was glad the closed schools for a couple days