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Reply to "Cost of adding HVAC to second level?"
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[quote=Anonymous]Dual zones and two units are separate things. Dual zones implies one unit separated into zones. Two units is just that - 2 separate units each with one zone. Neither setup is inherently more or less efficient, although a case can be made for a heat pump being slightly more efficient than a gas furnace. But that implies a two unit system since heat pumps are generally inadequate for all heating needs in this area.[/quote]
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