Review
The Goodman 3.5/5-ton horizontal system bridges practical heating and cooling needs for residential installations across diverse fuel environments. Combining a 120,000 BTU furnace with a 42,000 BTU cooling capacity, this unit operates on propane or natural gas while delivering ENERGY STAR certification. Online Supply positions this as a mid-market option for contractors and homeowners seeking dependable performance without premium pricing, backed by Goodman's established service network and documented reliability history.
Heating efficiency reaches 96% AFUE through a two-stage burner that modulates output based on demand, reducing cycling losses. The air conditioner's 16 SEER1 rating and R410A refrigerant compatibility exceed baseline efficiency standards, qualifying buyers for regional utility rebates. The variable-speed ECM blower automatically adjusts airflow between 0-2000 CFM, minimizing energy waste during partial-load operation while maintaining consistent comfort across 120-square-foot to 150-square-foot spaces.
Pros & Cons
Pros
- 96% AFUE heating efficiency reduces winter fuel costs by 10-15% compared to 80% units
- 16 SEER1 cooling rating exceeds ENERGY STAR requirements and qualifies for utility rebates
- Variable-speed ECM blower motor adapts to load, improving comfort and reducing runtime energy use
- Two-stage burner provides quiet operation at part-load and better temperature modulation
- Dual-fuel capability (natural gas and propane) adds flexibility for diverse installation scenarios
Cons
- 73 dB noise level is moderately loud, comparable to older equipment, not quieter than premium alternatives
- Single-stage compressor means cooling runs at one fixed capacity rather than modulating efficiency
- Specs show conflicting tonnage data (3.5 tons in title, 5 tons in specs), creating confusion on actual capacity
Who Should Buy
Best For
Homeowners in rural or propane-dependent areas who value dual-fuel capability and strong heating efficiency. Contractors seeking reliable, rebate-qualified equipment for residential retrofit projects where cost-effectiveness and two-stage comfort matter.
Consider Alternatives If
Buyers prioritizing quiet operation or those seeking advanced variable-capacity cooling, which requires two-stage compressors not found in this unit.
Installation
This horizontal A-coil configuration mounts in attics or crawlspaces with 50 feet of suction line insulation (0.5 inch thickness). Requires 115V single-phase power and 23.5 to 40-amp breaker sizing. PVC or plastic exhaust flue compatibility simplifies venting. Most installations take 4-6 hours for experienced technicians, assuming ducting already exists.
Warranty & Reliability
Goodman provides a lifetime warranty on the heat exchanger (major component protection) and 10-year parts coverage with online registration. This strong heat exchanger guarantee reflects confidence in build quality, though registration is mandatory to activate it. Typical labor remains customer responsibility, which is standard in the market.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 120,000 |
| Refrigerant | R410A or R22 |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | Lifetime Heat Exchanger and 10 Years Parts with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 48.000000 |
| Feature | Spec |
| 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 | 23.5 amps |
| Tonnage | 5 Ton |
| Height | 34.5" |
| Width | 24.5" |
| Depth | 28.75" |
| Resources | Goodman Brochure Goodman Install 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 | Upflow/Horizontal |
| Liquid Line | 3/8" |
| Suction Line | 1 1/8" |
| Style | A-Coil |
| AHRI Certificate Number | 7368842 |
| Airflow Direction | Upflow/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
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