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Warranty Information

All units come with full manufacturer warranty covering parts. Register your warranty within 60 days of purchase for extended coverage.

80% AFUE 24-1/2" Wide Cabinet Upflow / Horizontal Natural Gas R-32 Coil Compatible

A note on "R-32" in the title: This is a gas furnace and does not contain refrigerant. The "R-32" designation means this furnace is engineered to serve as the indoor air-mover beneath an R-32 coil, with airflow and safety features that meet current A2L refrigerant system standards.

Performance at a Glance

120,000

BTU/h

Heating Input

96,000

BTU/h

Heating Output

80%

AFUE

Heating Efficiency

Blower Motor

24-1/2"

Wide

Cabinet Size

Key Features

What sets the GR9S801205DNA apart

80% AFUE Heating Efficiency

Converts 80% of the natural gas it burns into usable heat for your home. 80% AFUE meets federal minimum efficiency requirements for residential gas furnaces and is the baseline for dependable, cost-effective home heating.

Aluminized Steel Heat Exchanger

A durable aluminized-steel tubular heat exchanger resists corrosion and thermal fatigue over long service life. The heat exchanger is where combustion heat transfers to the airflow — its durability is the single most important factor in furnace longevity.

1 HP Multi-Speed ECM Blower

A 1 HP multi-speed ECM blower motor moves conditioned air through your home's ductwork in both heating and cooling modes. Your HVAC contractor will select the correct blower speed for your home's airflow requirements at installation.

Upflow or Horizontal Installation

Designed for flexible installation — upflow position (cool air enters the bottom, warm air exits the top) or horizontal (airflow moves sideways). This lets your contractor fit the furnace into a utility room, closet, or attic based on your home's ductwork layout.

Electronic Ignition

Modern electronic ignition eliminates the standing pilot light of older furnaces, reducing gas waste during idle periods. Reliable ignition across the furnace's lifetime with no manual relighting required after power outages or vacation shutoffs.

Backed by Goodman

Covered by Goodman's 10-Year Parts Limited Warranty and Lifetime Heat Exchanger Limited Warranty when registered within 60 days of installation.

This Goodman GR9S80 single-stage gas furnace produces 120,000 BTU of heating output at 80% AFUE efficiency. The aluminized-steel dual-diameter tubular heat exchanger and hot-surface igniter provide reliable ignition, and the multi-speed ECM blower motor delivers quiet, efficient air circulation in upflow, downflow, or horizontal installations. AHRI Certified and ETL Listed; backed by a 99-year heat exchanger limited warranty with product registration.

Heavy-duty aluminized-steel heat exchanger — dual-diameter tubular design rated for long service life.
Single-stage gas valve — reliable on/off heating control with a durable hot-surface igniter.
Multi-speed ECM blower motor — energy-efficient circulation with multiple airflow taps for system matching.
Quiet, single-speed draft inducer — consistent venting performance with reduced operating noise.
Self-diagnostic control board — stores fault history for easier troubleshooting during service.
Color-coded low-voltage terminals — simplifies thermostat wiring during installation.
Multi-position installation — supports upflow and horizontal configurations.
Provisions for accessories — compatible with electronic air cleaners and humidifiers.
99-year heat exchanger limited warranty — with product registration within 60 days of installation.

Complete Specifications

GR9S801205DNA — Goodman 120,000 BTU 80% AFUE Gas Furnace

Model & Configuration
Model Number	GR9S801205DNA
Heating Input	120,000 BTU/h
Heating Output	96,000 BTU/h
AFUE Rating	80%
Cabinet Size	D (24-1/2" wide)
Installation Orientation	Upflow / Horizontal
Fuel Type	Natural Gas
R-32 Coil Compatible	Yes
Blower
Blower Motor HP	1 HP
Blower Type	Multi-Speed ECM
Electrical
Minimum Circuit Ampacity (MCA)	14.3 A
Maximum Overcurrent Protection (MOCP)	25 A
Physical
Shipping Weight	132 lbs

Warranty Coverage

Protection you can count on when properly registered

10 Year

Parts Limited Warranty

Lifetime

Heat Exchanger Limited Warranty

Warranty terms require online product registration within 60 days of installation. See official Goodman warranty documents for complete terms and conditions.

Documentation

Manufacturer spec sheets for this product

Furnace Spec Sheet
PDF — Tap to download

Frequently Asked Questions

What does AFUE mean?

AFUE (Annual Fuel Utilization Efficiency) measures how much of the gas a furnace burns actually becomes usable heat for your home. An 80% AFUE rating means 80 cents of every dollar spent on fuel heats your home; the remainder exits through the flue during combustion. 80% AFUE is the federal baseline efficiency for residential gas furnaces.

Is 80% AFUE efficient enough for my home?

An 80% AFUE furnace is the standard baseline for regions with mild-to-moderate winters. In colder climates or if your heating bills are a priority, higher-efficiency furnaces (90–97% AFUE) cost more upfront but use less fuel over time. The right choice depends on your local climate, fuel prices, installation costs, and how long you'll own the home.

What size home does a 120,000 BTU furnace heat?

A 120,000 BTU/h input furnace (about 96,000 BTU/h output at 80% AFUE) is generally appropriate for homes in the 2,400–3,600 sq. ft. range, though climate zone, insulation quality, window area, and home orientation all affect heating load. A professional Manual J load calculation is the most accurate way to size a furnace for your specific home.

What does "Upflow / Horizontal" mean?

This furnace can be installed in two positions. Upflow means the furnace sits vertically with cool return air entering the bottom and warm supply air exiting the top — typical for basement or utility-room installations. Horizontal means it lays on its side with airflow moving sideways — common in attics or crawlspaces. Your HVAC contractor will select the orientation based on your home's ductwork and available install space.

Why does this gas furnace title mention "R-32"?

This is a gas furnace — it does not contain refrigerant. The "R-32" designation indicates the furnace is engineered to serve as the indoor air handler beneath an R-32 air conditioner or heat pump coil, with airflow characteristics and A2L safety compliance required for current R-32 HVAC systems. If you're replacing an older furnace paired with an R-410A coil, be aware that swapping just one side of the system may require updating the other.

How do I know if this cabinet size fits my home?

Goodman cabinet widths are: A = 14", B = 17-1/2", C = 21", D = 24-1/2". The GR9S801205DNA is a Cabinet D (24-1/2" wide). Cabinet width matters because the coil or air handler sitting on top needs to match — a mismatch means a transition piece or new coil. If you're replacing an existing Goodman furnace, matching the cabinet letter is usually the simplest path. Your HVAC contractor can confirm fit.

Can this furnace run on LP / propane instead of natural gas?

This specific model is configured for Natural Gas. Some Goodman furnaces can be field-converted between natural gas and LP using a conversion kit; compatibility depends on the specific model and burner configuration. Consult the installation manual or your HVAC contractor before attempting any fuel conversion — it's not a DIY operation and improper conversion can be dangerous.

What maintenance does a gas furnace need?

Change the air filter every 1–3 months during heating season. Regular maintenance keeps the furnace efficient, extends its service life, and catches safety issues (especially carbon monoxide risks) early.

How do I register for the warranty?

Register the unit online at Goodman's warranty registration page within 60 days of installation. You'll need the model number (GR9S801205DNA), serial number (found on the data plate), installation date, and installing contractor information. Without timely registration, warranty terms revert to a shorter base period.

Designed, engineered, and assembled in the U.S.A. by Goodman Manufacturing — a member of the Daikin group.