They use it day and night
During the day our school rents classrooms to cover for the overflow of students they had this year, and in the evening they use them to teach adult education and reading and many other subjects. The mobile classrooms are easily used this way as they are units that are dependent only on themselves so the heat and air conditioning does not have to run high or low for the whole school while only a few rooms are being used. It really saves on energy and the fees that they would incur. The parents and people in the town are grateful as they pay less for the upkeep.