It’s the middle of summer in New York City, and the hum of air conditioners is a familiar soundtrack. But in central Harlem, that sound comes with a warning. As of August 5, at least 58 people have contracted Legionnaires’ disease — and two have died — in an outbreak believed to be tied to a contaminated cooling tower. Again. The city’s health department is testing towers in the area encompassing the zip codes 10027, 10030, 10035, 10037, and 10039, and bordering communities. So far, 11 cooling towers have tested positive for Legionella pneumophila. The city’s health department is urging…