Goodman - 80,000 BTU 80% Gas Furnace - 21" Width - Upflow / Horizontal - Single Stage - 115V - R32 - GR9S800805CU

Goodman - 80,000 BTU 80% Gas Furnace - 21" Width - Upflow / Horizontal - Single Stage - 115V - R32 - GR9S800805CU

The GR9S800805CU Goodman gas furnace features high-quality construction and efficient operation at a great value. The GR9S800805CU 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 GR9S800805CU.

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
• 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

• Reliable Heating: 80,000 BTU output efficiently warms small to medium homes.

• Energy Performance: 80% AFUE provides solid efficiency while keeping costs reasonable.

• Flexible Installation: 21" width supports upflow or horizontal configurations.

• Consistent Operation: Single-stage design ensures steady, dependable heat.

• Easy Integration: 115V power supply fits most residential systems.

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

• Quiet Operation: Designed for minimal operational noise during heating cycles.

Q&A

Q: What size homes is this furnace best for?
A: With 80,000 BTU heating capacity and 80% AFUE, this model is ideal for medium‑sized homes or residential spaces depending on insulation and climate.

Q: How efficient is this furnace?
A: It features an 80% AFUE efficiency rating, meaning about 80% of fuel energy is converted into heat, delivering dependable performance at a competitive efficiency level.

Q: What does “single stage” mean?
A: A single‑stage gas valve operates at full heating output every time, offering straightforward and reliable heating performance.

Q: What installation configurations does it support?
A: Designed for both Upflow and Horizontal installs, giving flexibility for basements, attics, closets, or crawl spaces.

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

Q: What type of blower motor does it include?
A: Features a multi‑speed ECM blower motor, providing smooth airflow and quieter operation than basic motors.

Q: What fuel and venting does it require?
A: Powered by natural gas (convertible to LP with an optional kit) and uses metal flue venting typical of an 80% AFUE furnace.

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

Q: What are the key benefits?
A: Offers reliable, consistent heat, flexible installation, durable construction, and simple operation at a value‑oriented price.

Maintenance Tips

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

• Keep supply and return vents clear to ensure proper heating performance.

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

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

• Check thermostat settings and operation to maintain consistent temperature control.

• Examine vent pipes and connections for leaks or blockages.

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

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

• Test carbon monoxide detectors for safe operation.

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