Goodman 100,000 BTU 80% AFUE Gas Furnace

GR9S801005CN Goodman 100,000 BTU Gas Furnace

GR9S801005CN is a Goodman residential gas furnace designed to deliver dependable heating and flexible indoor airflow. It provides 100,000 BTU per hour of heating input, approximately 80,000 BTU per hour of heating output and 80% AFUE performance. Its single-stage heating system and nine-speed ECM blower make it suitable for compatible residential split HVAC systems.

The furnace supports upflow or horizontal installation and uses a 21-inch-wide cabinet. It can be combined with an approved evaporator coil and outdoor air conditioner to create a complete gas split system. The furnace, coil and condenser must be properly sized and matched before installation.

100,000 BTU Heating Input

The GR9S801005CN has a rated natural-gas heating input of 100,000 BTU per hour. With an 80% AFUE rating, the furnace delivers approximately 80,000 BTU per hour of usable heating output under standard test conditions.

AFUE represents the percentage of fuel energy converted into useful seasonal heat. An 80% AFUE furnace transfers approximately 80% of the fuel’s energy into the conditioned space, while the remaining portion exits through the combustion venting system.

The correct heating capacity must be determined through a professional load calculation. Climate, insulation, windows, air leakage, ceiling height, ductwork and building construction all influence the amount of heat required. A 100,000 BTU furnace should not be selected using square footage alone.

Single-Stage Gas Heating

The GR9S801005CN uses a single-stage gas valve. When the thermostat calls for heat, the furnace operates at its available heating capacity until the indoor temperature reaches the selected setting.

This straightforward configuration provides familiar operation and service requirements. Proper sizing is important because an oversized single-stage furnace may cycle too frequently, while an undersized furnace may struggle to maintain the desired indoor temperature during colder conditions.

Nine-Speed ECM Blower

The GR9S801005CN includes a nine-speed electronically commutated blower motor. Its available speed settings allow the installer to coordinate airflow with the heating application, evaporator coil, outdoor air conditioner and duct system.

The furnace supports up to approximately 2,000 CFM and up to 5 tons of nominal cooling airflow under appropriate operating conditions. Actual airflow depends on the selected speed setting, duct static pressure, filter condition, evaporator coil and complete equipment configuration.

The 5 ton designation refers to the blower’s maximum nominal cooling support. It does not mean the furnace produces five tons of heat. Heating performance is determined by its 100,000 BTU input and approximately 80,000 BTU output.

Upflow or Horizontal Configuration

The GR9S801005CN is designed for upflow or horizontal installation. In an upflow application, return air enters through the lower portion of the cabinet and conditioned air exits through the top. In an approved horizontal application, the furnace operates on its side.

The installation orientation, return-air arrangement, venting, combustion-air requirements and service clearances must follow Goodman’s instructions. This furnace is intended for compatible site-built residential applications and should not be used in a manufactured or mobile home unless the equipment certification explicitly permits that application.

Durable Heat Exchanger and Ignition

The furnace uses a heavy-duty aluminized-steel tubular heat exchanger designed for dependable heat transfer and resistance to repeated thermal cycling. A single-stage gas valve regulates fuel flow during heating operation.

A durable hot-surface igniter lights the burners electronically when heating is requested. The single-speed induced-draft blower supports combustion airflow and moves combustion gases through the approved venting system.

The self-diagnostic control board stores fault information to help qualified technicians identify operating problems. Color-coded low-voltage terminals also help simplify thermostat and accessory connections during installation.

Compact Residential Cabinet

The GR9S801005CN measures approximately 33⅜ inches high, 21 inches wide and 28 inches deep. Its listed shipping weight is approximately 132 pounds. The cabinet contains a 10-by-10-inch blower assembly and a ¾-horsepower ECM motor.

Cabinet dimensions are not the same as the minimum installation clearances. The contractor must provide sufficient space for return air, supply ductwork, combustion air, venting, filter replacement and future service.

Electrical and Gas Requirements

This Goodman furnace operates on a 115-volt, single-phase, 60 Hz electrical supply. Published specifications list a minimum circuit ampacity of approximately 11.3 amps and a maximum overcurrent device of 15 amps.

The gas connection is 1/2-inch FPT. Factory fuel configuration must be confirmed before installation. Conversion to propane requires the correct manufacturer-approved conversion kit, gas-pressure adjustments and professional combustion testing.

Electrical wiring, grounding, gas piping and overcurrent protection must follow the equipment nameplate, Goodman instructions and applicable building codes. All gas connections must be properly tested for leaks before operation.

Venting and Emissions Requirements

As an 80% AFUE furnace, this model requires code-compliant combustion venting. The listed vent diameter is approximately 4 inches, but final vent design must follow the installation manual, local codes and the National Fuel Gas Code.

This product is listed as a non-Low-NOx configuration. It may not meet emissions requirements in certain regulated jurisdictions. Local efficiency, emissions and installation rules should be confirmed before purchase.

Compatible Cooling Equipment

The GR9S801005CN is the gas furnace only. It does not include an outdoor condenser, evaporator coil, thermostat, refrigerant line set, filter cabinet, venting materials or installation accessories unless those items are specifically included in a package.

The furnace includes controls designed to support newer system safety requirements, but the furnace itself does not circulate refrigerant. The evaporator coil, outdoor condenser and related components determine the complete system’s refrigerant type and certified efficiency.

Professional Installation Required

The GR9S801005CN must be installed and commissioned by a qualified HVAC professional. Installation includes gas-pressure adjustment, combustion testing, venting, electrical wiring, blower setup, temperature-rise verification and safety-control testing.

Review the official Goodman gas furnace information and browse more HVAC equipment from Xpress Supply. Confirm the fuel type, heating load, cabinet width, local emissions requirements and complete equipment match with your contractor.