Goodman Ultra-Low Nox Furnace California | 80000 BTU 80% Efficient Gas Furnace Multi-Speed ECM | Upflow / Horizontal | R32 (GR9S800805CU)
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Key features
- 80,000 BTU output with 80% AFUE non-condensing efficiency
- California Ultra-Low NOx certified, meeting 14 ppm NOx requirement
- Multi-speed ECM blower motor reduces electricity use versus PSC motors
- Upflow and horizontal installation orientations supported
- Compatible with R-32 refrigerant coil systems for split configurations
- Goodman value-tier pricing, typically 15 to 25 percent below Trane, Carrier, or Lennox equivalents
About this system
The Goodman GR9S800805CU is an 80,000 BTU, 80% AFUE gas furnace built specifically for California’s Ultra-Low NOx emissions requirements. Where a standard furnace might emit 40 parts per million of nitrogen oxides, California Air Resources Board rules demand 14 ppm or lower in most South Coast and Bay Area air districts, and this unit meets that threshold. If you are replacing a furnace in California and your HVAC contractor tells you the job requires a ULN unit, this model is one of the more affordable ways to satisfy that requirement without stepping up to a 90%-plus condensing furnace.
The GR9S800805CU runs an 80% AFUE rating, meaning 80 cents of every dollar of gas burned becomes usable heat. That is the federally permitted minimum for non-condensing furnaces and a step below the 90 to 98% AFUE tier. The multi-speed ECM blower motor is a genuine efficiency upgrade over a standard PSC motor: it ramps airflow to match demand rather than running full blast constantly, which trims electricity consumption and tends to deliver more even temperatures room to room. The upflow and horizontal configuration options make it a practical replacement candidate for most closet, basement, or attic installations. The R-32 notation on this furnace refers to a coil compatibility rating rather than to refrigerant the furnace itself handles, since gas furnaces do not use refrigerant directly.
The GR9S800805CU is a workable, code-compliant California replacement furnace at a price that leaves room in the budget for quality installation labor. Its 80% AFUE rating is the floor of efficiency rather than the ceiling, so homeowners in colder California climates or those with high gas bills should price out a 96%+ AFUE alternative before committing. Long-term ownership costs depend heavily on installer quality and on whether you land in the unlucky minority who encounter capacitor failures or coil issues after year seven.
Overall score is the average of the five ratings above.
What we like
- Meets California Ultra-Low NOx rules, making it legal for use in CARB-regulated districts
- Multi-speed ECM motor delivers better comfort and lower blower electricity cost than single-speed alternatives
- Entry-level price point leaves budget for a quality install, which matters more than brand for longevity
- Upflow and horizontal versatility suits most residential replacement scenarios
- Goodman's parts availability is broad and most HVAC techs are familiar with the platform
Trade-offs
- 80% AFUE is the legal minimum, not an efficient choice; a condensing 96%+ unit can cut gas use by 20 percent
- Goodman's ConsumerAffairs rating sits around 2.5 out of 5, with repair costs after year seven a recurring complaint
- Dual-run capacitors are a documented failure point across Goodman equipment, typically surfacing as a $300 to $600 service call
- Compressor and heat exchanger longevity averages shorter than premium brands, with component life typically in the 10 to 14 year range
What homeowners and pros say about Goodman
Homeowners who buy Goodman furnaces tend to divide into two camps once a few years have passed. The larger group appreciates the upfront savings and reports years of uneventful operation, particularly when the original installation was done carefully by an experienced tech. The smaller but vocal group on ConsumerAffairs, where Goodman scores around 2.5 out of 5, describes escalating repair bills after roughly year seven, with dual-run capacitor failures being the single most cited issue. That repair typically runs $300 to $600 and is not unique to Goodman, but it does show up in owner accounts more frequently than buyers expect. Google dealer reviews land considerably higher, around 3.8 out of 5 across locations, where affordability is the most repeated reason for satisfaction.
HVAC technicians who work on Goodman equipment regularly tend to have a pragmatic view of the GR9S800805CU specifically. They note that the ECM blower is a genuine asset and that California ULN compliance narrows the competitive field, making Goodman’s price advantage more meaningful here than in states where any furnace qualifies. Their consistent caution is that Goodman’s longevity gap versus Trane or Carrier widens when the installation is rushed or the equipment is slightly undersized or oversized for the home. Evaporator coil leaks and compressor lifespans averaging 10 to 14 years rather than the 15 to 20 years more common in premium brands are the documented failure modes technicians flag most often for budget-tier Goodman systems. The consensus is that spending the upfront savings on a thorough commissioning and a service agreement is the single best thing an owner can do to protect the investment.
Sources: ConsumerAffairs Goodman owner reviews, AHRI Directory of Certified Product Performance, U.S. DOE appliance and equipment efficiency standards, Goodman product specification sheets.
How it compares
| Brand | Comparable model | SEER2 | Stage | Price position |
|---|---|---|---|---|
| Goodman | GR9S800805CU | N/A (furnace only) | Multi-speed | Value pick |
| Carrier | Performance 80 (58TP0) | N/A (furnace only) | Multi-speed | Moderately higher than Goodman |
| Trane | S8X2 80% AFUE | N/A (furnace only) | Multi-speed | Moderately to significantly higher than Goodman |
| Lennox | Merit ML180 | N/A (furnace only) | Single/Multi-speed | Moderately higher than Goodman |
Competitor rows are comparable single-stage units at similar efficiency; price is relative position, not a quote.
Questions about this system
Does this furnace actually meet California's Ultra-Low NOx rules, and do I need to verify anything with my air district?
Yes, the GR9S800805CU is rated for California's 14 ppm NOx standard enforced in South Coast AQMD and Bay Area AQMD jurisdictions. You should still confirm your specific air district's current requirements with your contractor, since rules and phase-in dates vary by region and are updated periodically.
Why does the spec sheet mention R-32 refrigerant for a gas furnace?
A gas furnace does not contain or handle refrigerant itself. The R-32 designation indicates the furnace's coil cabinet and airflow ratings are matched for use with an R-32 refrigerant air conditioning coil in a split system. The furnace side simply moves air; the refrigerant lives in the coil and outdoor unit.
Is 80% AFUE worth it in California, or should I spend more for a 96% unit?
In mild coastal California climates with short heating seasons, the payback on the higher upfront cost of a 96% unit can stretch to seven or more years, making 80% reasonable. In the Central Valley, high desert, or any zone with 1,500-plus heating hours per year, a 96%+ condensing furnace often recovers the price difference faster. Run the numbers with your contractor using your actual gas rate and estimated annual run hours.
What is the warranty on this Goodman furnace, and what does it actually cover?
Goodman typically offers a 10-year parts limited warranty on registered units and a lifetime heat exchanger limited warranty. Registration must generally be completed within a set window after installation to activate the full term. Labor is not covered, so a repair after year one means paying a service call and labor out of pocket even if the part itself is free.
How often do Goodman furnaces need repairs, and what should I budget for?
Dual-run capacitors are the most commonly reported failure point across Goodman equipment and typically cost $300 to $600 to replace including labor. Most owners report years one through six as relatively trouble-free; complaint volume on platforms like ConsumerAffairs rises noticeably after year seven. Keeping a $500 to $800 maintenance reserve is a reasonable approach given the brand's track record.
Specifications
| Furnace output | 80000 BTU |
| Configuration | Upflow |
| Refrigerant | R-32 |
| Model | GR9S800805CU |