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A much-touted heat wave hitting the Southland resulted Monday in 108 service calls — but no emergencies — for air-conditioning units at LA Unified schools as summer school begins for elementary and middle schools on Tuesday.

The technicians for the school district’s facilities division began working overtime over the weekend in preparation for the anticipated high temperatures, according to Elvia Perez Cano of the LA Unified communications department.

“They will and continue to work overtime all week,” Cano said.

Summer school starts Tuesday for elementary and middle schools. Summer school for high school begins next week on June 27.

As of Monday, the district had 985 active calls for the HVAC (heating, ventilating and air conditioning) systems at the district schools, with 341 in the progress of being fixed. By noon Monday, 27 issues were completed, Cano said.

Last September, when temperatures soared into triple digits during school, there were 346 units that needed repairing and more than 2,600 calls. In the meantime, $300 million of a $1 billion Critical Repair Fund established three years ago has been used for air conditioners.

An estimated 30,000 LA Unified classrooms and more than 1,000 other public spaces, such as hallways, locker rooms and libraries, use about 68,000 air control venting devices throughout the district, but the problem is that most of the units are more than 30 years old, district officials have said.