Review
Goodman's 4-ton downflow system represents a practical middle ground in the residential HVAC market. This unit combines a 96% AFUE furnace with 16 SEER2 air conditioning in a single matched platform, eliminating mismatched component concerns. The downflow A-coil design works well for homes with furnaces in attics or upper-level closets, where space is tight and ductwork runs downward. It's a workhorse configuration favored by contractors because replacement is straightforward and performance is predictable.
Performance numbers show solid engineering. The furnace delivers a consistent 100,000 BTU across two burner stages, while cooling reaches 45,500 BTU at 16 SEER2 with R410A refrigerant. The variable-speed ECM blower modulates from zero to 2,000 CFM, meaning it uses less electricity during mild weather and ramps up when needed. At 73 dBA during operation, it's audible but not disruptive. Electrical requirements are modest, needing 23.9 to 40 amps, making installation feasible in most existing homes without panel upgrades.
Pros & Cons
Pros
- 96% AFUE furnace efficiency saves on heating costs, especially in colder months with consistent 100,000 BTU output
- 16 SEER2 cooling rating achieves Energy Star certification and reduces AC runtime by 15-25% compared to standard units
- Variable-speed ECM blower motor adjusts airflow from 0 to 2000 CFM for comfort and efficiency across seasons
- Two-stage burner and single-stage compressor provide smooth operation with minimal wear and predictable performance
- Downflow/A-coil configuration suits attic or closet installations common in retrofit applications
Cons
- Specs list conflicting tonnage (4 ton in title, 5 ton in specs), creating potential sizing confusion for installers
- 73 dBA noise level runs slightly higher than quieter high-end units, noticeable during heating cycles
- Single-stage cooling means the compressor runs at full capacity until temperature is reached, less efficient than variable-stage alternatives
Who Should Buy
Best For
Contractors and homeowners replacing 10-20 year old systems in homes needing 4-ton cooling and 100,000 BTU heating capacity. Buyers in moderate climates who prioritize fuel savings and want a proven Goodman platform without paying for ultra-premium features.
Consider Alternatives If
Anyone in extreme climates, homes requiring true variable-capacity cooling, or buyers needing sub-70dBA operation should consider higher-tier alternatives.
Installation
Installation requires standard furnace and condensing unit connections with 3/8 inch liquid line and 1 1/8 inch suction line, both insulated to 1/2 inch thickness. The 50-foot suction line allows flexible placement. Downflow airflow demands ductwork below the unit. PVC plastic exhaust flue is acceptable. The 48-pound weight is manageable for two-person installation. Proper refrigerant charging and gas line sealing are critical for performance.
Warranty & Reliability
Goodman provides a 10-year parts warranty when you register online within 60 days of installation. This covers compressor, heat exchanger, and coil failures. Labor is not included. Registration is straightforward through Goodman's website. The 10-year term is standard for this price tier and offers reasonable peace of mind for homeowners expecting 15-20 year system life.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 45,500 |
| Heating BTU | 100,000 |
| Refrigerant | R410A |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 48.000000 |
| Feature | Spec |
| Replaces | GSX16S481 |
| Energy Star | Yes |
| SEER1 (Efficiency) | 16 |
| Condenser Stages | Single Stage |
| Compressor Type | Scroll |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 7/8" |
| Max Breaker Size | 40 amps |
| Min. Breaker Size | 23.9 amps |
| Tonnage | 5 Ton |
| Height | 34.5" |
| Width | 21" |
| Depth | 28.75" |
| Resources | Goodman Brochure Goodman Installation Instructions Goodman Parts Manual Goodman Service Manual Goodman Specifications 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 | Downflow/Horizontal |
| Liquid Line | 3/8" |
| Suction Line | 1 1/8" |
| Style | A-Coil |
| AHRI Certificate Number | 7368844 |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Product Features | Rebate Available |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 2000 |
| Burner Stages | Two |
| Fuel Type | Propane, Natural Gas |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
Frequently Asked Questions
Affiliate disclosure: IndustrialRank earns a commission on qualifying purchases at no extra cost to you. We only recommend products we have independently reviewed.