Review
The Goodman 3.5 ton combo system represents solid mid-market HVAC equipment designed for retrofit applications where space and cost constraints matter. Manufactured by Goodman, a trusted name in contractor-grade equipment, this downflow configuration delivers 100,000 BTU heating capacity paired with 42,000 BTU cooling output. The system uses R410A refrigerant and features an A-coil design typical of furnace-condenser combinations. It's positioned for homeowners upgrading from older single-stage units and contractors standardizing on reliable, affordable inventory.
Performance numbers tell the real story. The furnace hits 96% AFUE efficiency, meaning 96 cents of every gas dollar converts to usable heat, a significant jump from older 80-85% equipment. Cooling efficiency rates at 14 SEER, which translates to approximately 14 BTU removed per watt-hour consumed, delivering meaningful summer utility savings. The scroll compressor, single-stage design, and multi-speed blower motor provide stable operation. The 2000 CFM maximum airflow supports proper air circulation across typical 3.5 ton loads without oversizing complications.
Pros & Cons
Pros
- Exceptional 96% AFUE furnace efficiency minimizes gas waste and lowers winter utility bills substantially
- 14 SEER cooling provides mid-tier efficiency with 42,000 BTU capacity suitable for 3.5 ton loads
- Multi-speed blower motor allows balanced airflow and better humidity control than single-speed alternatives
- Downflow/horizontal configuration fits attic and basement installations where traditional upflow won't work
- PVC exhaust compatibility simplifies venting in tight spaces compared to metal ductwork requirements
Cons
- Not ENERGY STAR certified despite strong 96% AFUE rating, which may affect some utility rebates
- Single-stage burner and compressor mean less precise modulation compared to variable-capacity competitors
- 73 dBA noise level runs slightly louder than premium models, noticeable in quiet homes or bedroom areas
Who Should Buy
Best For
Contractors handling downflow furnace replacements in budget-conscious markets, and homeowners in attic or basement installations seeking reliable heating and cooling without premium pricing. This unit strikes the right balance between efficiency gains and affordability.
Consider Alternatives If
Anyone prioritizing ultra-quiet operation or needing variable-capacity staging should look at higher-tier models with modulating compressors and multi-stage burners.
Installation
Installation requires 208/230V single-phase electrical service with 22-35 amp breaker compatibility, standard in most residential settings. The downflow orientation means ductwork routes beneath the unit, ideal for attic and basement placement. Suction line uses 7/8 inch copper with 3/8 inch insulation, and liquid line requires 3/8 inch diameter. The PVC exhaust flue simplifies venting considerably. Unit dimensions are 32.5 inches tall, 29 inches wide, and 29 inches deep, with the flue on the right side.
Warranty & Reliability
Goodman provides 10 years parts coverage with online registration, a meaningful protection period that covers compressor and heat exchanger failures common in years 5-10. Registration is straightforward but essential, as unregistered units default to shorter terms. This warranty reflects confidence in the product's durability and gives contractors peace of mind on installations.
Specifications
| SKU | LS38783830 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 100,000 |
| Refrigerant | R410A |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Multi Speed |
| Maximum CFM | 2000 |
| Configuration | Upflow / Downflow |
| Flue Location | Right |
| Burner Stages | Single |
| Fuel Type | Gas |
| Height | 32.5" |
| Width | 29" |
| Depth | 29" |
| Resources | Goodman Installation Manual Goodman Specifications Goodman Brochure Goodman Warranty Information Goodman Service Instructions Goodman Kit Instructions Goodman Parts Manual 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. |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Tonnage | 3.5 Ton |
| Style | A-Coil |
| Energy Star | No |
| SEER1 (Efficiency) | 14 |
| Condenser Stages | Single Stage |
| Compressor Type | Scroll |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 7/8" |
| Max Breaker Size | 35 amps |
| Min. Breaker Size | 22 amps |
| Suction Line Insulation Thickness | 3/8" |
| Length | 30 feet |
Frequently Asked Questions
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