Goodman 80,000 BTU 96% AFUE Two-Stage Variable Speed Gas Furnace Downflow/Horizontal 21" Cabinet R-32

Variable speed downflow comfort for medium to large homes — Goodman's best technology in a wide 21" cabinet. The Goodman GDVT960804CN is loaded with ComfortBridge™ technology that runs and stores diagnostics in the CoolCloud™ app, so you can monitor your system from your smartphone — paired with a heavy-duty aluminized-steel tubular heat exchanger, stainless steel secondary heat exchanger, and silicon nitride igniter for exceptional efficiency and long-term reliability. Built for homes with 2-4 ton R-32 cooling systems that need Goodman's most advanced downflow furnace performance. 

Why You'll Love It:

• 96% AFUE efficiency — converts 96 cents of every energy dollar into heat, the highest efficiency rating available in the Goodman downflow furnace lineup — a significant upgrade over 80% and 92% models
• 80,000 BTU input / 76,800 BTU output — powerful, consistent heating for medium to large homes without oversizing or wasted capacity
• True variable-speed ECM blower — continuously and intelligently adjusts airflow to match exact heating and cooling demand for maximum comfort, minimum noise, and lower electricity costs
• 4-ton blower sizing — specifically engineered to handle the airflow requirements of up to 4-ton R-32 cooling systems in the 21" downflow cabinet
• 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
• Auto-Comfort mode — automatically optimizes airflow and temperature balance for whole-home comfort without manual adjustments
• Enhanced dehumidification mode — actively manages indoor humidity levels during cooling season for greater year-round comfort
• ComfortBridge™ communicating technology — enables smarter system communication between components for optimized whole-home comfort and efficiency
• CoolCloud™ Bluetooth app — allows contractors to commission, diagnose, and service the unit directly from a smartphone or tablet without removing the cabinet panels
• Downflow / horizontal installation — purpose-built for closets, alcoves, and attic installs where air needs to travel downward through the duct system
• Wide 21" cabinet — compatible with 2-4 ton R-32 cooling systems — need 5-ton compatibility? See the GDVT961005CN
• Certified for direct vent (2-pipe) or non-direct vent (1-pipe) — flexible venting configurations for easier installation in a variety of applications
• Left or right gas and electrical connections — convenient field flexibility for faster, easier installation
• Heavy-duty aluminized-steel tubular primary heat exchanger — engineered for long-lasting durability and efficient heat transfer with wrinkle-bend technology for added dependability
• Stainless steel secondary heat exchanger — extracts additional heat from exhaust gases to achieve the industry-leading 96% AFUE efficiency rating
• Heavy-gauge steel cabinet with less than 2% air leakage — airtight construction minimizes heat loss and reduces sound output for quieter, more economical operation
• 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 with constant memory — stores the last fault codes so your technician can diagnose issues fast, cutting service time and costs
• Compatible with electronic air cleaners and humidifiers — wire directly to the low-voltage terminals on the control board for seamless indoor air quality integration
• LP convertible — easily field-converted to propane with optional kit, giving you fuel flexibility for your home
• PVC/plastic venting required — high-efficiency condensing operation requires plastic vent pipe, not metal
• Low NOx emissions — meets air quality requirements for nationwide installation
• 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

⚠️ Downflow / Horizontal installation only. For upflow applications, see the GRVT960804CN.

⚠️ PVC/Plastic venting required — this is a 96% AFUE condensing furnace and cannot use metal flue venting.

⚠️ Not sure which 21" downflow model you need? If your cooling system is 5 tons, see the GDVT961005CN. This unit — the GDVT960804CN — is specifically for homes with 2-4 ton cooling systems.

Specs:

• Input: 80,000 BTU | Output: 76,800 BTU
• AFUE: 96%
• Cabinet Width: 21"
• Stages: Two
• Blower Motor: True Variable Speed ECM (4-Ton)
• Fuel Type: Natural Gas (LP Convertible)
• Installation: Downflow / Horizontal
• Venting: PVC / Plastic — Single or Dual Pipe
• 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.