The American Standard S9B1 Gas Furnace is a single-stage, energy-efficient solution designed to provide consistent warmth with up to 92% AFUE efficiency. Equipped with the Vortica™ II blower, this furnace delivers quiet and precise heating all year long. Its ENERGY STAR® certification ensures efficient fuel use, while flexible temperature control lets you pair it with a heat pump for optimal performance. Built with durable components, the S9B1 is a reliable choice for long-lasting home comfort.