As Mike Passeggio went about his work this week, the sun did so as well, melting his frozen plastic water bottle as he hauled old ducts and other air-conditioning equipment from the attic of a house here.

“You got to do something, put music on or something, and don’t think about it,” Mr. Passeggio, 26, said of the sweltering heat that makes attics hotter and stuffier than other parts of a home. “Think cold.”

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