Goodman 100,000 BTU Two Stage Gas Furnace 80 Percent AFUE Upflow 21 Inch Cabinet

Two-stage comfort for large homes — serious heating power without the serious efficiency price tag. The Goodman GR9T801005CN delivers 100,000 BTU of two-stage heating at 80% AFUE in a wide 21" upflow cabinet built for basements, closets, and utility rooms in large homes and cold climates. Run quieter and more efficiently on mild days at lower output — then kick into full power when winter really sets in. Smart, reliable, and built to last.

Why You'll Love It:

• 80% AFUE efficiency — converts 80 cents of every energy dollar into heat, keeping operating costs predictable without overpaying for efficiency you don't need
• 100,000 BTU input / 80,000 BTU output — serious heating power built for large homes and demanding cold-climate installations without oversizing or waste
• Two-stage gas valve — runs at lower output on mild days for gentler, quieter cycling and more even room temperatures, then ramps to full power when temperatures really drop
• 9-speed ECM blower motor — precise, quiet airflow with better zoning compatibility, eliminating hot and cold spots and outperforming older PSC motor units
• Upflow / horizontal installation — flexible placement in basements, closets, or utility rooms to suit your home's layout
• Wide 21" cabinet — compatible with 2-4 ton R-32 cooling systems for a complete, balanced home comfort setup
• Heavy-duty aluminized-steel tubular heat exchanger — engineered for long-lasting durability and efficient heat transfer with wrinkle-bend technology for added dependability
• Silicon nitride igniter — more durable than older hot surface igniters, reducing maintenance calls and replacement costs over the life of the unit
• Self-diagnosing control board — acts like a "check engine light" for your furnace, pinpointing issues fast and cutting service time and costs
• LP convertible — easily field-converted to propane with optional kit, giving you fuel flexibility for your home
• Metal flue venting required — straightforward installation using standard metal duct for safe, code-conforming exhaust
• R-32 compatible — future-ready refrigerant support for pairing with modern R-32 cooling systems
• AHRI Certified and ETL Listed — independently verified for safety and performance
• Made in the USA — designed, engineered, and assembled domestically

⚠️ Metal venting required — this is an 80% AFUE furnace and requires metal flue venting, not PVC.

Specs:

• Input: 100,000 BTU | Output: 80,000 BTU
• AFUE: 80%
• Cabinet Width: 21"
• Stages: Two
• Blower Motor: 9-Speed ECM
• Fuel Type: Natural Gas (LP Convertible)
• Installation: Upflow / Horizontal
• Venting: Metal
• Voltage: 115V
• Compatible Cooling: 2-4 Ton R-32 Systems

Warranty: 10-year limited parts + lifetime heat exchanger warranty with online registration within 60 days of installation.