Goodman - 80,000 BTU 80% Variable Speed Low NOx Gas Furnace - 21" Width - Upflow / Horizontal - Two Stage - 115V - R32 - GRVT800804CX

Goodman - 80,000 BTU 80% Variable Speed Low NOx Gas Furnace - 21" Width - Upflow / Horizontal - Two Stage - 115V - R32 - GRVT800804CX

The Goodman GRVT800804CX gas furnace is part of Goodman's top-of-the-line series, known for its exceptional performance. This low NOx furnace features a two-stage burner and a variable speed blower motor, ensuring optimal comfort and efficiency. With the outstanding durability and reliability that Goodman 80% efficient furnaces are known for, we are proud to offer you this high-quality heating solution.

Features

• This furnace is ideal to heat a small to medium house (in average climate conditions)
• 80,000 BTU 80% AFUE two stage variable speed natural gas furnace
• Requires metal flue venting
• Can be used in the upflow 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

• Balanced heating performance: With 80,000 BTU input and ~80% AFUE, this furnace delivers reliable warmth for most small‑to‑medium homes at a practical operating cost.

• Two‑stage operation for comfort: The two‑stage gas valve favors low‑stage heating during everyday use, providing gentler temperature transitions, quieter cycles, and fewer hot/cold swings than single‑stage models.

• Variable‑speed blower benefits: The variable‑speed blower motor enhances airflow efficiency, quieter operation, and better humidity control, resulting in more consistent indoor comfort.

• Low NOx emissions design: Engineered with Low NOx combustion, this unit helps reduce nitrogen oxide output, supporting cleaner local air quality compared with standard furnaces.

• Installation flexibility: Supports both upflow and horizontal orientations, giving contractors more placement options in attics, crawl spaces, or closets.

• Right‑sized footprint: At 21″ width, it fits a wide range of installation spaces without compromising performance.

Q&A

Q: What heating capacity and efficiency does this furnace offer?
A: The Goodman GRVT800804CX delivers 80,000 BTU input with ~64,000 BTU usable heat at 80 % AFUE, offering reliable heating for small to medium homes. 

Q: What performance features does it include?
A: It has a two‑stage gas valve plus a variable‑speed ECM blower motor for quieter operation, smoother airflow, and improved comfort control compared with basic single‑stage units. 

Q: Is this furnace Low NOx compliant?
A: Yes — this model is Low NOx compliant, helping reduce nitrogen oxide emissions for areas requiring lower emissions (check local codes). 

Q: What installation orientations are supported?
A: It supports upflow and horizontal installation, giving flexibility for attic, crawl space, or closet installations. 

Q: What fuel and electrical requirements are there?
A: Operates on natural gas (propane convertible with a field kit) and runs on 115 V single‑phase power with standard metal flue venting. 

Q: What are the physical dimensions?
A: Approximate size is 21″ W × 28″ D × 33 ⅜″ H, fitting standard residential furnace spaces. 

Maintenance Tips

• Replace or clean air filters every 1–3 months to maintain airflow and protect the variable-speed blower.

• Keep supply and return vents clear for consistent heating performance.

• Check thermostat settings to ensure proper two-stage operation.

• Maintain a clean, clutter-free furnace area for safe ventilation.

• Inspect venting system for blockages or leaks to ensure safe combustion.

• Monitor for unusual noises or odors and contact an HVAC professional if necessary.

• Schedule annual professional maintenance to inspect burners, heat exchanger, ignition system, and gas connections.