New “Casteel Christmas” Program Helps Cobb and Fulton Families Stay Warm This WinterSupported by a growing sponsorship base that includes Ironstone Bank, and Kudzu.com, Marietta-based Casteel Heating & Cooling is helping needy Cobb and Fulton residents by providing free furnace repair services valued at $100,000. The new program, called Casteel Christmas, complements existing programs such as H.E.A.T. that offset energy costs. It comes not a moment too soon for cold kids this Christmas.