The Goodman GMH8/GDH8 is a multi-speed, two-stage gas furnace with an efficiency rating of 80% AFUE. It is designed for multi-position installation — the GMH8 is an upflow horizontal unit, and the GDH8 is a dedicated downflow unit. It reduces energy usage by operating on low speed up to 90% of the time, while the multi-speed blower and two-stage gas valve help reduce noise levels. The unit features a tubular aluminized steel primary heat exchanger, along with an electronic control board with self-diagnostics and a left or right connection for gas and electric service. The heavy-gauge steel cabinet has a baked enamel finish and is fully insulated to improve efficiency while reducing sound levels.
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