Goodman GR9S800803BN 80,000 BTU Gas Furnace: Is This 80% Efficiency Furnace Worth It in 2026?
This 80,000 BTU gas furnace heats entire homes but is not a portable space heater. It needs professional installation and a separately purchased thermostat to operate.
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Our Verdict
This Goodman furnace delivers 80,000 BTU of heat output. That is enough to warm a full-size home over 2,000 square feet. It is a permanent HVAC appliance, not a plug-in space heater.
The multi-speed ECM motor gives you quieter airflow than older single-speed designs. You do not get a thermostat in the box. You must purchase one separately before the unit will operate.
At $1,228.99, this is a major home heating investment. Add professional installation and gas line work to that purchase price. It is best suited for homeowners replacing an existing whole-home furnace.
The 17.5-inch cabinet width fits standard HVAC closets and utility rooms. It installs upflow or horizontal to match your ductwork layout. Downflow installation is not supported by this model.
What We Like
- Outputs 80,000 BTU of heat, enough to warm a home over 2,000 sq ft.
- Multi-speed ECM motor runs quieter than standard single-speed blower motors.
- Fits a 17.5-inch wide cabinet space for tight mechanical room installs.
- Supports both upflow and horizontal installation for flexible placement.
- Aluminized steel primary heat exchanger resists corrosion for long-term durability.
What Could Be Better
- No thermostat included. You must buy one separately to operate this furnace.
- No tip-over protection or overheat shutoff listed in product specifications.
- Cannot be installed in a downflow configuration, limiting placement options.
- No timer, remote control, or Wi-Fi connectivity of any kind.
- Weighs 115 pounds and requires professional gas and electrical installation. It is not portable.
Standout Features
Full Specifications
Additional Info
| Assembly | No |
Frequently Asked Questions
Common questions about Goodman 80,000 BTU 80% Efficiency Multi-Speed, Single-Stage upflow/Horizontal Furnace Model: (GR9S800803BN) Cabinet is 17.5 inches wide-R32 Ready-Nationwide Installation-NOT Including CA
Does this furnace come with a thermostat?
No. The thermostat is sold separately. You need to purchase and install a compatible thermostat before the furnace will operate.
How much space can this furnace heat?
At 80,000 BTU with 80% efficiency, this furnace can heat approximately 2,000 to 2,600 square feet depending on your home's insulation and layout.
Can this be installed as a downflow furnace?
No. This model only supports upflow and horizontal installation. For downflow, the manufacturer says to look for model numbers beginning with GD9.
What older furnace models does this replace?
This model replaces the GMES800803BN and GM9S800803BN. You can use it as a direct upgrade for either of those older units.
What is the cabinet width of this furnace?
The cabinet is 17.5 inches wide. This is a standard furnace width that fits most existing HVAC closets and utility rooms.
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