Review
Goodman's 4 ton downflow system represents the practical middle ground in residential HVAC equipment. This unit pairs an 80,000 BTU furnace with 45,500 BTU cooling capacity, delivering balanced performance for mixed heating and cooling climates. The system supports both natural gas and propane fuel, making it flexible for various installation environments. At this pricing level, contractors and homeowners expect solid efficiency without cutting corners on components, and this unit delivers on that promise with its variable-speed blower and two-stage heating.
The furnace's 96% AFUE rating genuinely improves operating costs, converting 96 cents of every fuel dollar into usable heat. The variable-speed ECM blower motor automatically adjusts to 1600 CFM maximum capacity, improving air distribution and reducing runtime. Cooling efficiency registers at 16 SEER, which is respectable but not leading-edge. The two-stage burner keeps the system from running at full capacity constantly, extending equipment lifespan and maintaining steadier indoor temperatures. The 208/230V single-phase electrical requirement fits standard residential service.
Pros & Cons
Pros
- 96% AFUE furnace efficiency reduces heating costs significantly compared to 90-92% models
- Variable-speed ECM blower motor optimizes airflow and reduces energy consumption
- Two-stage burner delivers better temperature control and comfort during partial-load heating
- Energy Star certified, qualifying for potential utility rebates in many regions
- Compact 21x21x30 inch footprint fits standard downflow and horizontal installations
Cons
- SEER 16 cooling efficiency lags behind newer 18+ SEER systems launching in 2024
- Single-stage condenser means cooling capacity doesn't modulate, only cycles on and off
- 73 dBA noise level is audible during operation, slightly louder than premium models
Who Should Buy
Best For
Homeowners in moderate climates seeking reliable heating with strong efficiency gains, and contractors who prioritize straightforward installation in mixed-fuel markets. This unit makes sense for customers wanting 96% AFUE performance without premium pricing.
Consider Alternatives If
Buyers in hot climates prioritizing cooling efficiency, or those seeking cutting-edge SEER ratings above 18, should explore newer multi-stage compressor systems instead.
Installation
Downflow configuration allows flexible placement in attics, basements, or utility closets with horizontal ducting runs. The unit requires plastic or PVC exhaust flue, which simplifies venting compared to metal-only systems. At 48 pounds, it's manageable for two-person installation. Standard electrical connections use 23.9 to 40 amp breakers. Refrigerant lines use 3/8 inch liquid and 1 1/8 inch suction connections with 1/2 inch insulation for up to 50 feet of line set.
Warranty & Reliability
Goodman provides 10 years parts and labor coverage upon online registration. This warranty compares favorably to industry baseline five-year terms but trails premium manufacturers offering 10-year warranties as standard. Registration is simple but mandatory to activate full coverage. The warranty covers compressor, furnace heat exchanger, and coil defects, protecting your investment against major component failures.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 45,500 |
| Heating BTU | 80,000 |
| Refrigerant | R410A or R22 |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 48.000000 |
| Feature | Spec |
| AHRI Certificate Number | 7368843 |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Product Features | Rebate Available |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 1600 |
| Configuration | Upflow / Downflow |
| Energy Star | Yes |
| Burner Stages | Two |
| Fuel Type | Propane, Natural Gas |
| Height | 30" |
| Width | 21" |
| Depth | 21" |
| Resources | CAPF Installation Manual CAPF Specifications Sheet Goodman Evaporator Coil 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. |
| Replaces | GSX16S481 |
| 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 |
| Liquid Line | 3/8" |
| Suction Line | 1 1/8" |
| Style | A-Coil |
| 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.