Goodman - 80,000 BTU 97% Variable Speed Modulating Gas Furnace - 21" Width - Downflow / Horizontal - 115V - R32 - GDVM970804CN

Goodman - 80,000 BTU 97% Variable Speed Modulating Gas Furnace - 21" Width - Downflow / Horizontal - 115V - R32 - GDVM970804CN

With a 97% efficiency rating, a variable-speed blower motor, and modulating gas valves, the GDVM970804CN is part of Goodman's top-tier furnace series. If you're looking to reduce your gas bill, the GDVM970804CN is an excellent choice, offering one of the best efficiency levels available on the market.

Features

• Ideal to heat a small to medium house (in an ideal climate)
• 80,000 BTU 97% AFUE modulating variable speed natural gas furnace
• Requires plastic/PVC flue venting
• Can be installed in the downflow or horizontal orientation
• Can be converted to propane with an LP conversion kit (sold separately)
• Innovative design for electrical efficiency, safety, and lower sound output
  

Specifications

Manual

• Installation Manual
• Specifications Sheet
  

What our Experts Think

• Exceptional Efficiency: 97% AFUE with variable-speed modulation for precise, energy-saving heating.

• Powerful Heating: 80,000 BTU output ideal for medium to large homes.

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

• Variable-Speed Comfort: Modulating operation ensures consistent temperature and quieter performance.

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

• Durable Build: Designed for long-term reliability across diverse climates.

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

Q&A

Q: What size home is this furnace suitable for?
A: With 80,000 BTU input and a high 97% AFUE efficiency rating, this furnace is ideal for medium‑to‑large homes needing efficient, year‑round heating.

Q: How energy efficient is the unit?
A: It delivers 97% AFUE, meaning nearly all fuel is converted into heat — helping lower utility bills and improve comfort.

Q: What does “variable speed modulating” mean?
A: The modulating gas valve and variable‑speed ECM blower adjust heat output and airflow in fine increments to match demand, offering precise temperature control, quieter operation, and better comfort than single‑stage models.

Q: What installation configurations are supported?
A: Supports downflow and horizontal mounting, allowing flexible placement in attics, crawl spaces, or utility areas.

Q: What electrical requirements does it have?
A: Operates on 115 V single‑phase power with typical residential electrical specs.

Q: What fuel type and conversion options are available?
A: Designed for natural gas and convertible to LP (propane) with an optional kit.

Q: What features improve reliability and diagnostics?
A: Includes a self‑diagnostic control board, ComfortNet™ compatibility, color‑coded low‑voltage terminals, and durable silicon nitride igniter for dependable performance.

Q: What venting does it require?
A: As a high‑efficiency condensing furnace, it uses plastic/PVC flue venting for exhaust.

Q: What are the comfort benefits?
A: Modulating output and variable‑speed blower help reduce temperature swings, lower noise, and improve humidity control

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 and proper airflow.

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

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

• Examine vent pipes and connections for leaks, blockages, or corrosion.

• Listen for unusual noises such as rattling, humming, or uneven airflow that may indicate issues.

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

• Test carbon monoxide detectors for safe operation.

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