Goodman - 80,000 BTU 80% Low NOx Gas Furnace - 17.5" Width - Downflow / Horizontal - Two Stage - 115V - R32 - GD9T800804BX

Goodman - 80,000 BTU 80% Low NOx Gas Furnace - 17.5" Width - Downflow / Horizontal - Two Stage - 115V - R32 - GD9T800804BX

The GD9T800804BX Goodman gas furnace features high-quality construction and efficient operation at a great value. The GD9T800804BX two-stage, 9-speed furnace utilizes Goodman's superior heat exchanger design to provide efficient, reliable heating to your home. If you're looking to cut your energy bills and improve your comfort without breaking the bank, your search stops with the Goodman GD9T800804BX.

Features

• This furnace is ideal to heat a medium house (depending on climate)
• 80,000 BTU 80% efficient natural gas furnace
• Requires metal flue venting
• Can be used in the downflow or horizontal orientation
• Can be converted to an LP furnace with a conversion kit (sold separately)
• Innovative design for electrical efficiency, safety, and lower sound output
  

Specifications

Manual

• Installation Manual
• Specifications Sheet
  

What our Experts Think

• Modern Low‑NOx Heating for Cleaner Emissions
  The Goodman GD9T800804BX 80,000 BTU Gas Furnace meets Low NOx emission standards, reducing nitrogen oxides for cleaner indoor/outdoor air—important for areas with stricter environmental requirements.

• Balanced Comfort with Two‑Stage Operation
  The two‑stage gas valve delivers gentler low‑fire heat during mild weather and full output on cold days, enhancing comfort consistency and efficiency compared with basic single‑stage units.

• Efficient Airflow & Quiet Operation
  A 9‑speed ECM blower motor provides steady, energy‑efficient airflow and quieter operation across seasons, while the two‑speed induced‑draft blower balances performance and sound control.

• Durable, Installer‑Friendly Design
  Fully insulated heavy‑gauge steel cabinet with baked‑enamel finish, removable bottom panel for flexible return placement, and left/right service connections simplify installation and long‑term maintenance.

• Flexible Placement for Tight Spaces
  Designed for downflow or horizontal installs in attics, closets, and basements, this 17.5″ wide furnace fits common tight spaces without costly duct modifications.

• Reliable Ignition & Smart Diagnostics
  Features like the SureStart silicon nitride igniter and built‑in self‑diagnostic control board improve reliability and make troubleshooting faster for technicians.

Q&A

Q1: What heating capacity and efficiency does this furnace deliver?
A: The Goodman GD9T800804BX offers 80,000 BTU input (~64,000 BTU output) with an 80% AFUE rating, converting most fuel into usable heat for year‑round comfort.

Q2: What type of operation and stages does it use?
A: It features a two‑stage gas valve, providing quieter, more economical heating than single‑stage units.

Q3: What installation orientations are supported?
A: This model supports downflow and horizontal installation, offering flexibility for attics, crawl spaces, or closets.

Q4: Does it have a low‑emission burner?
A: Yes — this is a Low NOx furnace compliant with stricter nitrogen‑oxide emission standards in many regions.

Q5: What motor and airflow features are included?
A: It includes a 9‑speed ECM blower motor for smooth airflow, quieter performance, and better comfort control.

Q6: What construction and control features does it offer?
A: Comes with a heavy‑gauge insulated steel cabinet, SureStart® silicon nitride igniter for long life, self‑diagnostic control board, and two‑speed induced‑draft blower.

Q7: What are the electrical and venting requirements?
A: Runs on 115 V, single‑phase power with metal flue venting required for 80% AFUE furnaces.

Q8: What fuel types are supported?
A: Compatible with natural gas and propane (LP) with conversion kit.

Maintenance Tips

• Replace Air Filters Every 1–3 Months – Check the return air filter monthly and replace often to maintain airflow, protect the blower, and prevent overheating or flame rollout. Dirty filters reduce efficiency and can stress internal components.

• Annual Professional Inspection – Have a qualified HVAC technician inspect burners, heat exchanger, ignition system, gas pressure, and venting before the heating season to ensure safe and efficient operation.

• Clear Area Around Furnace – Keep the space around the furnace free of dust, debris, and combustible items to support airflow and reduce fire risk.

• Check Exhaust & Vent Paths – Ensure metal flue venting remains unobstructed and well‑sealed; blockages or leaks can cause combustion issues or carbon monoxide hazards.

• Inspect Electrical & Control Components – Periodically inspect control board connectors, limit switches, and wiring for tight, corrosion‑free connections.

• Test Safety Devices & Thermostat – Confirm flame rollout sensors, limit switches, and thermostat settings work properly; test carbon‑monoxide detectors for safety.

• Document All Maintenance – Track filter changes, professional services, and any repairs to support warranty coverage and future troubleshooting.