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With temperatures rising, school officials decided to let students go at 10 a.m.
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Maintenance crews were called in to assess the problem.
By Tuesday afternoon, officials said the air-conditioning unit had been fixed and the school would be open Wednesday.
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Zebulon Middle also closed early because of AC issues. The school's unit has been repaired.
Fuquay Varina High School sustained a "very brief partial outage," according to a Wake Schools spokesperson, and Buckhorn Creek had a partial outage.
All the AC units are back in working order.
Big Weather said the high in Raleigh on Tuesday was 95 degrees.