Review
This Goodman combination system pairs a high-efficiency gas furnace with a standard air conditioning condenser in a downflow configuration. The 97% AFUE heating efficiency and modulating burner design place it firmly in the contractor-grade segment, competing against mid-tier units from Lennox and Carrier. The system carries ENERGY STAR certification, suggesting genuine efficiency gains over baseline models. Goodman's reputation centers on reliable, affordable equipment that performs solidly without premium pricing.
Performance specifications reveal a well-balanced unit for temperate climates. The furnace delivers 100,000 BTU heating output with a modulating burner that adjusts flame intensity rather than cycling on and off, reducing temperature swings. The variable-speed ECM blower motor ranges from 0 to 2000 CFM, matching airflow to actual heating demand. Cooling arrives via a scroll compressor at 45,500 BTU (approximately 3.8 tons), with 16 SEER1 efficiency. The 115V single-phase electrical design fits standard residential circuits with 23.9 to 40 amp breaker sizing.
Pros & Cons
Pros
- 97% AFUE modulating burner reduces heating costs compared to standard 80-85% units by approximately 15-20%
- Variable-speed ECM blower motor adjusts airflow from 0 to 2000 CFM, improving comfort and reducing noise
- ENERGY STAR certified with 16 SEER1 cooling efficiency on the air conditioner side
- Scroll compressor is proven reliable in residential applications with lower failure rates than reciprocating designs
- PVC plastic exhaust flue compatible with modern venting codes and retrofit installations
- Modulating gas valve provides better temperature control than single-stage burners
Cons
- Spec sheet lists 4 ton cooling capacity in title but shows 5 ton tonnage and 45,500 BTU cooling output, creating confusion about actual system size
- 73 dB noise level is moderately loud, higher than premium multi-stage systems at 68-70 dB
- Single-stage compressor cannot modulate cooling like the heating side, limiting part-load efficiency during mild weather
- No pricing information provided despite major purchasing decision factor
Who Should Buy
Best For
Contractors replacing failed furnaces in homes with existing ductwork compatible with downflow configuration, and homeowners in zones 4-6 seeking to cut heating bills without replacing entire HVAC systems. This suits retrofits where AC tonnage is less critical than furnace efficiency.
Consider Alternatives If
Anyone needing precise cooling capacity for hot climates should look elsewhere, as the single-stage compressor and conflicting cooling tonnage specs create uncertainty. Homeowners prioritizing ultra-quiet operation should consider premium brands with multi-stage compressors.
Installation
Downflow configuration suits homes with crawl spaces or basements and existing horizontal ductwork. The unit measures 34.5 inches tall, 21 inches wide, and 28.75 inches deep, fitting most utility closets or furnace rooms. Installation requires plastic PVC venting, standard copper lineset connections (3/8 inch liquid, 1 1/8 inch suction), and proper refrigerant charge. ECM blower integration simplifies wiring compared to older single-speed motors.
Warranty & Reliability
Goodman provides 10 years of parts warranty with online registration, a solid mid-range coverage period. This protects against compressor failure and heat exchanger cracks, the two costliest repair scenarios. Registration is essential, as many claims require proof. Compared to premium brands offering 12-year warranties, this represents reasonable protection for equipment typically lasting 15-18 years with maintenance.
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 | 7424272 |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Product Features | Rebate Available |
| Furnace Efficiency / AFUE | 97% |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 2000 |
| Burner Stages | Modulating |
| Fuel Type | Propane, Natural Gas |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
Frequently Asked Questions
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