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Choosing a heating system for a home is usually a process of balancing cost, comfort, and convenience. As an hvac contractor in Pennsylvania, I've seen a recent trend toward a unique type of hot water heating system called hydro-air. Hydro-air systems transfer heat from water to air, but they use a fan-coil heat exchanger instead of the familiar fin-tube or cast-iron baseboards. The warmed air is then distributed through traditional ductwork. Hydro-air technology has been used for years in commercial and industrial applications with either hot water or steam as the heat source. Its popularity in the residential market is rising because it NOVEMBER JLC 1997 HEATING OPTIONS Hydro-Air The air handler in the