Sudden changes of temperature should be avoided. Care should be taken to see that the students do not become chilled by sitting in drafts. It is not safe for the teacher to regulate the heat of the schoolroom by his own feelings. His own good, as well as that of the students, demands that a uniform temperature be maintained. {CT 299.1}

Visse temperaturudsving bør undgås. Der bør passes på at de studerende ikke bliver nedkølede af at sidde i træk. Det er ikke sikkert for læreren at regulere klasseværelsets varme efter sine egne følelser. Hans eget bedste, såvel som de studerende, kræver at en ensformig temperatur fastholdes.