Goodman - 80,000 BTU 80% Gas Furnace - 17.5" Width - Downflow / Horizontal - Single Stage - 115V - R32 - GD9S800804BN

Goodman - 80,000 BTU 80% Gas Furnace - 17.5" Width - Downflow / Horizontal - Single Stage - 115V - R32 - GD9S800804BN

The GD9S800804BN Goodman gas furnace features high-quality construction and efficient operation at a great value. The GD9S800804BN single-stage, multi-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 GD9S800804BN.

Features

• This furnace is ideal to heat a medium-sized house (depending on climate)
• 80,000 BTU 80% efficient natural gas furnace
• Requires metal flue venting
• Can be used in the downflow or horizontal (left or right) 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

• 80,000 BTU Heating Capacity – Matches well with medium‑sized homes, providing steady warmth through colder months without oversized energy waste.

• 80% AFUE Standard Efficiency – Offers solid fuel efficiency at an affordable price point, making it a practical choice for budget‑conscious upgrades.

• Single‑Stage Operation – Simple on/off heating delivers reliable, easy‑to‑service performance suited for everyday residential use.

• Downflow / Horizontal Flexibility – Supports downflow and horizontal installations, ideal for basements, attics, or compact utility spaces.

• 17.5″ Width Cabinet – Slim design fits tight locations and simplifies installation in closets or cramped mechanical rooms.

• 115 V Power Compatibility – Works with standard household electrical service, reducing setup complexity.

• R‑32 System Ready – Designed to integrate with modern R‑32 refrigerant HVAC setups, ensuring future‑ready compatibility.

• Goodman Reliability – Backed by a trusted brand reputation with durable components and accessible serviceability.

Q&A

Q: What size space does this furnace heat?
A: This 80,000 BTU 80% AFUE furnace delivers about 64,000 BTU of usable heat — ideal for medium‑sized homes when properly sized with insulation and climate.

Q: What does 80% AFUE mean?
A: 80% AFUE means 80% of fuel is converted into heat for your home, while the rest is lost through the metal flue — a common efficiency level for standard gas furnaces.

Q: What type of heating operation does it use?
A: It uses a single‑stage gas valve, providing dependable, straightforward heat output when the thermostat calls for it.

Q: How does the blower motor improve comfort?
A: The multi‑speed ECM blower motor offers quieter airflow with better energy efficiency and comfort control than traditional PSC motors.

Q: What installation orientations are supported?
A: Designed for both downflow and horizontal (left/right) installations, offering flexibility for attics, crawl spaces, or utility closets.

Q: What are the physical and electrical specs?
A: Cabinet size: 17.5″ W × 28″ D × 33⅜″ H; operates on 115 V single‑phase power with typical breaker sizes around 11.3 – 15 A.

Maintenance Tips

• Replace Air Filters Every 1–3 Months: Maintains airflow, efficiency, and protects the blower motor.

• Keep Vents & Registers Clear: Avoid obstructions to ensure balanced airflow and consistent heating.

• Annual Professional Inspection: Have a technician check burners, heat exchanger, gas pressure, and airflow for safe operation.

• Inspect Venting System: Check flue pipes and exhaust vents for blockages or corrosion to ensure proper combustion gas flow.

• Maintain Surrounding Area: Keep the furnace area free of dust, debris, and flammable materials.

• Verify Thermostat Performance: Ensure the thermostat supports efficient single-stage heating.

• Monitor for Unusual Signs: Strange noises, odors, or inconsistent heating should prompt immediate professional service.