Review
The Goodman 4-ton combo system (SKU LS381183850) sits squarely in the practical middle ground of residential HVAC equipment. This downflow configuration pairs an 80,000 BTU furnace with a 48,000 BTU air conditioning condenser in one compact footprint measuring 30 inches high by 21 inches wide and deep. It's designed for homeowners and contractors seeking straightforward replacement systems without premium pricing, typically installed in existing downflow or horizontal applications where space and installation complexity matter.
The furnace delivers 96% AFUE efficiency, meaning 96 cents of every heating dollar converts to usable warmth. The cooling side rates 13 SEER1, providing moderate efficiency without the advanced staging found in 14+ SEER systems. A multi-speed blower motor reaching 1600 CFM maximum CFM allows some temperature control flexibility during part-load operation. The reciprocating compressor operates at 76 dBA, which is functional but notably louder than inverter-driven competitors. Both heating and cooling use single-stage operation, meaning full-capacity output with no gradual modulation.
Pros & Cons
Pros
- 96% AFUE furnace efficiency reduces heating costs significantly compared to older 80% units
- 13 SEER cooling efficiency meets modern baseline standards at competitive pricing
- Multi-speed blower motor (1600 CFM max) provides better temperature control than single-stage alternatives
- Flexible refrigerant compatibility with R410A or R22 simplifies system matching
- PVC flue capability eliminates expensive masonry vent requirements in many installations
Cons
- Single-stage compressor lacks variable capacity for gradual cooling adjustments
- 76 dBA noise level is louder than premium inverter-driven systems, which run 70-73 dBA
- Not ENERGY STAR certified despite reasonable efficiency ratings, suggesting mid-tier performance positioning
- Spec sheet lists conflicting tonnage (4 ton in title, 5 ton in specs) creating confusion
- 115V single-phase electrical requirement limits placement options in some commercial applications
Who Should Buy
Best For
Homeowners in moderate climates replacing functional but aging split systems who prioritize upfront cost savings over premium features. Contractors installing retrofit systems in existing downflow configurations where ductwork and flue setup align with this unit's specifications.
Consider Alternatives If
Buyers seeking ENERGY STAR certification, ultra-quiet operation below 72 dBA, or variable-capacity compressors for precise humidity control should explore Carrier or Lennox alternatives in higher efficiency tiers.
Installation
This unit requires 115V single-phase 60Hz electrical service with breaker capacity between 26.3 and 45 amps, making it suitable for standard residential circuits. The downflow configuration demands proper ductwork return and supply alignment. Refrigerant line sizing uses 3/8-inch liquid and 1 1/8-inch suction lines with 1/2-inch insulation on the suction side. PVC flue compatibility eliminates masonry vent costs in most installs. Technicians should verify existing duct dimensions match the 1600 CFM maximum airflow.
Warranty & Reliability
The system includes a 10-year warranty activated through online registration with Online Supply. This provides parts coverage but typically excludes labor and refrigerant. Registration is mandatory for the full term, so homeowners must complete this step at installation. This warranty period is standard for mid-tier equipment, positioning it between budget and premium brands.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 48,000 |
| Heating BTU | 80,000 |
| Refrigerant | R410A or R22 |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 76 |
| Weight (in lbs) | 48.000000 |
| Feature | Spec |
| Replaces | GSX130483, GSX130484, GSX130485 |
| Energy Star | No |
| SEER1 (Efficiency) | 13 |
| Condenser Stages | Single Stage |
| Compressor Type | Reciprocating |
| Liquid Line | 3/8" |
| Suction Line | 1 1/8" |
| Liquid Valve Size | 3/8" |
| Max Breaker Size | 45 amps |
| Min. Breaker Size | 26.3 amps |
| Tonnage | 5 Ton |
| Valve Type | Sweat |
| 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. |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Multi Speed |
| Maximum CFM | 1600 |
| Configuration | Upflow / Downflow |
| Flue Location | Right |
| Burner Stages | Single |
| Fuel Type | Gas |
| Style | A-Coil |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
Frequently Asked Questions
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