Based on the context and the answer, generate a question. 

Context: So well my 4th semester at Chaffey started last week . Got to say my classes are really boring . Well I have Alyssa in my math 420 class . Well my history 21 class I can not tell if it is boring or not because I only spent one day with my teacher and on thursday we had a substitute in this class and it was so hot in the classroom that the sub decided that all we had to do was sign in and leave .

Answer:

Because the air conditioner is broken .



What may be the reason why it was so hot in the classroom ?