By midday, a decision was made that it was unsafe to keep students and staff inside. They were dismissed at 12:15 p.m.
Students said their classmates and teachers could barely focus due to the heat.
"I know a couple kids went home sick," said Enloe High School Senior Jaylin Perkins.
"It's been really tiring, concentrating was really hard," said senior Lauren Koop. "Class was really, really hot."
"I was going to pass out to be honest with you," said junior Tim Newton. "Like it was so hot, I was sweating as soon as I came into class."
Maintenance crews are working to fix the problem. The district said they expect all the repair work to be finished in time to reopen the school on Wednesday.
School officials say if the repair work isn't finished in time, an email will be send out. If parents and students don't hear anything, that means things are "business as usual."