Goodman - 80,000 BTU 80% Gas Furnace - 21" Width - Upflow / Horizontal - Single Stage - 115V - R32 - GR9S800805CN
The GR9S800805CN Goodman gas furnace features high-quality construction and efficient operation at a great value. The GR9S800805CN 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 GR9S800805CN.
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 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% 80,000 BTU Single Stage Gas Furnace - 21" Width - Upflow / Horizontal |
| SKU |
GR9S800805CN |
| Weight (in lbs) |
132.000000 |
| AHRI Certificate Number |
215358059 |
| Airflow Direction |
Upflow/Horizontal |
| Exhaust Flue Requirement |
Metal |
| R-32 Compliant |
Yes |
| Brand/Manufacturer |
Goodman |
| Product Features |
New Refrigerant Compliant |
| Furnace Efficiency / AFUE |
80% |
| Heating BTU |
80,000 |
| Blower Motor |
9-Speed - ECM |
| Maximum CFM |
2200 |
| Configuration |
Upflow/Horizontal |
| Electrical |
115 V. 1 Phase 60 Hz |
| Max Breaker Size |
15 Amps |
| Min. Breaker Size |
11.3 Amps |
| Burner Stages |
Single |
| Fuel Type |
Propane, Natural Gas |
| Height |
33 3/8" |
| Width |
21" |
| Depth |
28" |
Manual
What our Experts Think
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80,000 BTU Heating Capacity – Well‑suited for mid‑size homes, providing dependable warmth through cooler months without oversizing energy use.
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80% AFUE Standard Efficiency – A practical balance of performance and value, offering solid heating performance at a competitive price.
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Single‑Stage Gas Furnace – Simple on/off operation ensures reliable, straightforward performance with easier maintenance and service.
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Upflow / Horizontal Installation Flexibility – Supports both upflow and horizontal duct configurations, making it adaptable to attics, basements, closets, or tight utility spaces.
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21″ Narrow Cabinet Width – A slim design that fits into compact spaces without sacrificing heating capacity.
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115 V Power Compatibility – Works with standard household electrical service for easy installation and wiring.
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R‑32 System Ready – Designed to pair with modern HVAC systems using R‑32 refrigerant, aligning with current efficiency and environmental standards.
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Trusted Goodman Durability – Built with reliable components and solid construction, backed by good parts availability and service support.
Q&A
Q: What heating capacity does this furnace deliver?
A: This unit provides 80,000 BTU input and about 64,000 BTU of usable heat with its 80% AFUE efficiency, ideal for medium‑sized homes when sized correctly.
Q: What does 80% AFUE mean?
A: 80% AFUE means 80% of the fuel’s energy becomes usable heat, while the rest is lost through the flue — a common efficiency level for reliable residential furnaces.
Q: What type of heating system is this?
A: It’s a single‑stage gas furnace with a single‑stage gas valve that operates at full output when heat is needed for simple, dependable heating.
Q: What blower motor does it use?
A: The furnace features a 9‑speed ECM blower motor, providing efficient airflow, quieter operation, and better comfort control compared with basic motors.
Q: Where can this furnace be installed?
A: Supports upflow and horizontal installation, making it suitable for attics, crawl spaces, basements, or tight utility areas.
Q: What fuel types does it support?
A: Factory‑configured for natural gas and field‑convertible to propane (LP) with the proper conversion kit.
Q: What ducting and venting does it require?
A: As an 80% AFUE model, it requires metal flue venting for exhaust rather than PVC used on high‑efficiency units.
Maintenance Tips
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Replace Air Filters Every 1–3 Months: Maintains airflow, protects the blower motor, and ensures efficient operation.
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Keep Vents & Registers Clear: Ensure supply and return vents are unobstructed for consistent heating.
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Annual Professional Inspection: Have a technician check burners, heat exchanger, gas pressure, and airflow for safe and efficient furnace operation.
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Inspect Venting System: Verify flue pipes and exhaust vents are clear and corrosion-free for proper combustion gas flow.
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Maintain Surrounding Area: Keep the furnace area free of dust, debris, and flammable materials.
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Check Thermostat Operation: Ensure the thermostat supports efficient single-stage heating.
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Monitor for Unusual Signs: Strange noises, odors, or inconsistent heating should prompt immediate professional service.
Damage 
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