Goodman - 40,000 BTU 80% Gas Furnace - 14" Width - Upflow / Horizontal - Single Stage - 115V - R32 - GR9S800403AU

Goodman - 40,000 BTU 80% Gas Furnace - 14" Width - Upflow / Horizontal - Single Stage - 115V - R32 - GR9S800403AU

The GR9S800403AU Goodman gas furnace features high-quality construction and efficient operation at a great value. The GR9S800403AU single-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 GR9S800403AU.

Features

• This furnace is ideal to heat a smaller house (depending on climate)
• 40,000 BTU 80% efficient natural gas furnace
• Requires metal flue venting
• Can be used in the upflow or horizontal (right or left) orientation
• Ultra Low-NOx Compliant for California
• Innovative design for electrical efficiency, safety, and lower sound output
  

Specifications

Manual

• Installation Manual
• Specifications Sheet
  

What our Experts Think

• Efficient Heating: 40,000 BTU output warms small spaces reliably.

• Energy Performance: 80% AFUE balances heating efficiency with cost-effectiveness.

• Flexible Installation: 14" compact width supports upflow or horizontal setups.

• Reliable Operation: Single-stage design ensures consistent heating.

• Easy Integration: 115V power supply compatible with standard residential systems.

• Durable Build: Engineered for long-term reliability in varied climates.

• Quiet Operation: Optimized for minimal noise during heating cycles.

Q&A

Q: What size space is this furnace designed for?
A: With 40,000 BTU heating capacity, this unit is ideal for small to medium homes or heating zones, depending on insulation and climate conditions.

Q: How efficient is this furnace?
A: It has an 80% AFUE efficiency rating, meaning about 80% of the fuel is converted into usable heat — a solid standard for reliable performance.

Q: What installation configurations are supported?
A: Designed for both Upflow and Horizontal installation, offering flexible placement in basements, closets, attics or crawl spaces.

Q: What does “single stage” mean?
A: A single‑stage gas valve operates at full output whenever the thermostat calls for heat, providing straightforward, dependable heating.

Q: What are the electrical requirements?
A: Operates on 115 V single‑phase power, which is standard for residential furnace installations.

Q: What type of blower motor does it use?
A: Features a multi‑speed ECM blower motor for quieter operation and consistent airflow.

Q: What fuel and venting does it require?
A: Runs on natural gas and is typically convertible to LP (propane) with an optional kit; requires metal flue venting for exhaust.

Q: Is this furnace compatible with modern HVAC systems?
A: Yes — it integrates with standard split‑system HVAC setups and R‑32 compatible refrigerant systems.

Q: What are the key benefits?
A: Reliable heating, simple operation, flexible installation, quiet blower, and affordable efficiency.

Maintenance Tips

• Replace air filters every 1–3 months to maintain airflow and efficiency.

• Keep supply and return vents clear of furniture, dust, and debris.

• Maintain 2–3 feet of clearance around the furnace for safe operation.

• Inspect the condensate drain line periodically to prevent clogs and water damage.

• Check thermostat settings and operation to ensure proper heating cycles.

• Examine vent pipes and connections for leaks or blockages.

• Listen for unusual noises such as rattling or humming, which may indicate mechanical issues.

• Clean blower compartment and internal surfaces to reduce dust buildup.

• Test carbon monoxide detectors to ensure safe operation with gas furnaces.

• Schedule annual professional maintenance to inspect burners, heat exchanger, gas connections, and controls.