The invoices don’t match how the building actually lives, that’s the sentence we hear from schools most often. No wonder: teaching happens a few hours a day, but heating and ventilation run on a static program that knows nothing about weekends, public holidays or exam periods.
Next to this is a week of consumption at a model faculty. It looks innocent, until you overlay the teaching timetable. Then it turns out that Saturday heats just like Tuesday and full power runs into empty classrooms every evening.
This is the cheapest saving in education: no insulation, no investment, just align the time programs with how the building actually runs. And make sure they stay that way after every break.