Comfort Systems USA Inc. announced Norman C. Chambers resigned his roles as president, chief operating officer, and director to accept a senior position in a different industry. “Norm Chambers brought excellent experience and leadership to Comfort Systems USA at a time when we were navigating some of the toughest conditions our industry has faced in the last 30 years,” Bill Murdy, chairman/CEO, said. Murdy will assume the president and chief operating officer roles for the present.