Sprinkler systems extinguished the fire just before firefighters arrived at the house, located at the corner of Pittsboro and McCauley streets, Chapel Hill Fire Marshal Caprice Mellon said.
Officials did not know what caused the window unit to catch fire, and Mellon said she was not sure how extensive the damage was. Firefighters were still attempting to clear smoke from the building and keep furniture from being damaged by water at about 10:45 p.m., Mellon said.
No injuries were reported at the scene, Mellon said. The fire department received the call at 9:51 p.m., and at least five units were dispatched to the scene.
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