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The Goodman GR9T800804CX is an 80,000 BTU, two-stage gas furnace rated at 80% AFUE, built for upflow and horizontal installation. Its two-stage gas valve and multi-speed ECM blower run at lower output most of the time, which gives steadier temperatures and quieter operation than a single-stage furnace. The aluminized steel tubular heat exchanger, silicon nitride igniter and self-diagnostic board are aimed at long service life and easier troubleshooting. It suits homeowners replacing an older 80% furnace who want two-stage comfort without stepping up to a high-efficiency condensing unit; at 80% AFUE it uses more fuel per unit of heat than 90%+ condensing rivals, and it is not a fit for sealed-combustion or cold-climate venting setups.
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Lowest price we've seen: $1,475.69 on Nov 7 at SameDaySupply.com. Tracked across 10 stores since Nov 7.
Ratings are middling, and owner comments split between those who find it a solid, quiet value and those who report failures and service headaches. Complaints cluster around reliability and the cost of repairs rather than heating performance.
The Goodman GR9T800804CX is a two-stage gas furnace for residential use. It has an 80,000 BTU input and an 80% AFUE efficiency rating. It is designed for upflow and horizontal installation and can be used in a complete Goodman HVAC system or as a replacement furnace.
The cabinet is fully insulated, heavy-gauge steel with a baked-enamel finish. The heat exchanger is an aluminized steel tubular design. A silicon nitride SureStart igniter starts the burners, and a two-speed induced draft blower moves combustion gases.
The two-stage gas valve adjusts output to demand for steadier temperatures and quieter operation. A multi-speed ECM blower motor adjusts airflow, and continuous fan capability circulates air between heating cycles. A self-diagnostic control board helps with maintenance and troubleshooting. It also has provisions for electronic air cleaners and 120V/24V humidifiers.
