Review
The Goodman 3 Ton 17.5 SEER 80% AFUE combination system positions itself as the practical middle ground between budget equipment and premium solutions. At $736, it bundles a 100,000 BTU gas furnace with a 35,000 BTU heat pump condenser in one upflow cabinet, appealing to contractors and homeowners seeking simplicity. Online Supply's SKU LS38783850 carries Goodman's reputation for accessible reliability without cutting corners on core components like the scroll compressor.
Performance data shows balanced capability across seasons. The 18 SEER2 cooling rating exceeds Energy Star minimums, while the 80% AFUE furnace delivers 100,000 BTU of heat via two-stage burner operation. The variable-speed blower manages up to 2000 CFM, adapting to demand rather than running at fixed speed. Sound output measures 72 dBA, acceptable for residential installation. Two-stage condenser operation reduces short-cycling in mild weather, stretching component life and lowering monthly runtime costs.
Pros & Cons
Pros
- Two-stage compressor and burner reduce cycling and improve part-load efficiency for milder weather operation
- 18 SEER2 cooling efficiency qualifies for Energy Star, beating the baseline 14 SEER2 minimum
- 80% AFUE furnace meets modern efficiency standards with two-stage burner for cleaner operation
- Variable-speed blower motor adapts airflow from 0 to 2000 CFM, reducing noise and energy waste
- 3.5-ton cooling capacity handles humid climates well with 35,000 BTU at reasonable 72 dBA sound level
- Scroll compressor technology offers proven reliability and quieter operation than rotary designs
- Sweat connections and standard 3/8 inch and 7/8 inch line sizes simplify installation
Cons
- 80% AFUE furnace trails high-efficiency 95% AFUE models by 15 points, costing more to heat over 15-20 years
- 18 SEER2 lags premium units at 20+ SEER2, so cooling efficiency gains plateau after moderate usage
- Metal exhaust flue requirement limits installation flexibility compared to condensing furnaces
Who Should Buy
Best For
Homeowners in moderate climates replacing 10-plus year old systems want reliable performance at reasonable cost. Contractors valuing straightforward installation and good parts availability appreciate this Goodman configuration.
Consider Alternatives If
High-efficiency seekers in cold climates should explore 95% AFUE furnaces, and those prioritizing peak cooling efficiency above all should consider 20+ SEER2 standalone heat pumps.
Installation
Installation favors experienced technicians and trained DIY installers. The upflow A-coil configuration suits attic or closet placement with adequate headroom (34.5 inches tall). Line sets require 3/8 inch liquid and 7/8 inch suction connections with 3/4 inch insulation over 50 feet maximum. Metal exhaust flue is mandatory. Electrical demands are moderate at 120V single-phase 60Hz with 21.9 to 35 amp breaker sizing, fitting most residential panels without major upgrades.
Warranty & Reliability
Goodman covers the unit for 10 years with online registration, standard industry practice for mid-tier equipment. This covers compressor, parts, and labor during the period. Registration is essential, not automatic, so buyers must complete it immediately upon installation. Warranty does not cover damage from improper installation, refrigerant mischarge, or frozen coils from neglected filters.
Specifications
| SKU | LS38783850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 35,000 |
| Heating BTU | 100,000 |
| Refrigerant | R410A |
| Electrical | 120 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 72 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Product Features | Two Stage Condenser |
| Energy Star | Yes |
| SEER1 (Efficiency) | 18 |
| Condenser Stages | Two Stage |
| Compressor Type | Scroll |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 7/8" |
| Max Breaker Size | 35 amps |
| Min. Breaker Size | 21.9 amps |
| Tonnage | 3.5 Ton |
| Valve Type | Sweat |
| Height | 34.5" |
| Width | 21" |
| Depth | 28.75" |
| Resources | Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual Goodman Technical Information Goodman User Information Goodman Warranty You will need Adobe® Acrobat® Reader to view PDF documents. |
| Safety Information | PROPOSITION 65 WARNING This product and many products on our site may contain a chemical know to the state of California to cause cancer or birth defects or other reproductive harm. For more information about Proposition 65 please Click Here. |
| Configuration | Upflow/Horizontal |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Style | A-Coil |
| Airflow Direction | Upflow/Horizontal |
| Exhaust Flue Requirement | Metal |
| Furnace Efficiency / AFUE | 80% |
| Blower Motor | Variable Speed |
| Maximum CFM | 2000 |
| Burner Stages | Two |
| Fuel Type | Propane, Natural Gas |
| Suction Line Insulation Thickness | 3/4" |
| Length | 50 feet |
Frequently Asked Questions
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