NEW YORK: Herb Van Gent points his infrared gun at a square of still unpainted gray shingle and clicks the trigger. He gets an immediate temperature reading: 143 degrees (62 degrees Celsius) and rising. Then he aims it 5 feet (1.5 meters) away to a square of roof I have just painted: 98 (37 degrees Celsius) and decreasing.
He smiles, announcing 45-degree Fahrenheit (26-degree Celsius) difference on the first coat. That means it also will be cooler inside the building, he says, which saves energy.
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