Goodman - 40,000 BTU 80% Gas Furnace - 14" Width - Upflow / Horizontal - Two Stage - 115V - R32 - GR9T800403AN
The GR9T800403AN Goodman gas furnace features high-quality construction and efficient operation at a great value. The GR9T800403AN 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 GR9T800403AN.
Features
- This furnace is ideal to heat a small house (depending on climate)
- 40,000 BTU 80% efficient natural gas furnace
- Requires metal flue venting
- Can be used in the upflow 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
| Goodman 80% 40,000 BTU Two Stage Gas Furnace - 14" Width - Upflow / Horizontal |
| SKU |
GR9T800403AN |
| Weight (in lbs) |
105.000000 |
| AHRI Certificate Number |
215358017 |
| Airflow Direction |
Upflow/Horizontal |
| Exhaust Flue Requirement |
Metal |
| R-32 Compliant |
Yes |
| Brand/Manufacturer |
Goodman |
| Replaces |
GM9C800403AN, GMEC800403AN |
| Product Features |
New Refrigerant Compliant |
| Furnace Efficiency / AFUE |
80% |
| Heating BTU |
40,000 |
| Blower Motor |
9 Speed - ECM |
| Maximum CFM |
1200 |
| Configuration |
Upflow/Horizontal |
| Electrical |
115v 1 Phase 60 Hz |
| Max Breaker Size |
15 Amps |
| Min. Breaker Size |
7.7 Amps |
| Burner Stages |
Two |
| Fuel Type |
Propane, Natural Gas |
| Height |
33 3/8" |
| Width |
14" |
| Depth |
28" |
Manual
What our Experts Think
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Efficient Two‑Stage Heating: The Goodman GR9T800403AN Gas Furnace uses two‑stage operation to run primarily at a lower heat level, delivering more even temperatures and quieter performance than single‑stage models.
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80% AFUE for Everyday Use: With 80% AFUE, this furnace converts a solid amount of fuel into heat, offering balanced energy use and reliable warmth for small to mid‑sized homes.
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Narrow 14″ Width: The compact cabinet makes it ideal for tight spaces, and supports both upflow and horizontal installations in attics, closets, crawlspaces, or basements.
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R32 Refrigerant Compatibility: Designed for modern HVAC standards, compatible with R32 refrigerant for efficient cooling pairing and reduced environmental impact.
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Durable Goodman Build: Constructed with quality materials and a dependable heat exchanger, engineered for long‑term performance.
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Value‑Focused Comfort: Combines advanced airflow staging and flexibility in a cost‑effective, space‑saving package, making it a smart choice for efficient home heating.
Q&A
Q: What heating capacity does this furnace deliver?
A: The Goodman GR9T800403AN delivers 40,000 BTU input (~32,000 BTU useful heat) — ideal for smaller homes and spaces when sized correctly.
Q: What does 80% AFUE mean?
A: 80% AFUE means about 80 ¢ of every $1 spent on fuel becomes usable heat, providing solid standard efficiency for everyday heating needs.
Q: What are the key comfort features?
A: Features include two‑stage gas valve for quieter, more efficient heating, 9‑speed ECM blower motor for smoother airflow and quieter operation, and self‑diagnostic control board for easier service.
Q: Where can this furnace be installed?
A: Supports upflow and horizontal installation, fitting in attics, basements, closets, or crawlspaces with limited vertical space.
Q: What electrical and power requirements does it need?
A: Operates on 115 V single‑phase power with typical residential breaker requirements (~15 A).
Q: Is this model compatible with modern refrigerant systems?
A: Yes — it’s R32 compliant, allowing integration with modern HVAC systems that use R32 refrigerant.
Q: What venting does the furnace require?
A: It requires metal flue venting, standard for non‑condensing 80% furnaces.
Q: Can it be used with natural gas or propane?
A: Factory‑equipped for natural gas and can be converted to propane (LP) with an optional conversion kit (sold separately).
Maintenance Tips
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Replace Air Filters Regularly: Inspect monthly and replace every 1–3 months to maintain airflow and protect the two-stage blower.
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Keep Vents & Registers Clear: Avoid blocking supply and return vents for consistent heating.
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Inspect Venting System: Check intake and exhaust pipes for debris, blockages, or damage to ensure safe operation.
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Clean Around the Furnace: Maintain 2–3 ft clearance to prevent dust buildup and allow proper airflow.
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Monitor Blower Performance: Two-stage blowers should operate quietly and smoothly; unusual noises may indicate maintenance needs.
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Check Thermostat & Power Supply: Ensure thermostat settings, gas supply, and 115V circuit are functioning correctly.
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Schedule Annual Professional Service: A licensed HVAC technician should inspect burners, heat exchanger, gas pressure, ignition system, and safety controls yearly.
Damage 
Loss 
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