ORLANDO, Fla. -

An emergency alert was issued Thursday at an Orlando high school, the fourth straight day air conditioning problems have plagued the school, according to officials.

Shari Bobinski, of Orange County Public Schools, said there's no AC in several portable classrooms at Dr. Phillips High School. Bobinski referred to the issue as a Freon problem.

She said because of the heat -- high temperatures were expected to reach the upper 90s in Orlando, with a heat index of about 105 degrees -- an emergency was declared.

Tommy Dimairo said his seventh period psychology class is in one of the portables with no air conditioning.

"With 40 bodies in a small portable it gets overwhelming," he said.

Students were being moved from nine portables to a computer lab or the media center, Bobinski said.

She said students who use the affected portables were affected for 50 minutes at a time, but changes were made beginning on Thursday.

Principal Suzanne Knight sent a message home to parents alerting them of the significant AC problems.

"OCPS maintenance is working to resolve these issues as quickly as possible. They were on campus today and have gotten several portables up and running again. They will be on campus again tomorrow to continue the repairs," she said.

A similar issue occurred at Lawton Chiles Middle School last week.