Review
The Goodman 3.5 ton downflow gas furnace and air conditioner system occupies a practical middle ground in the residential HVAC market. This 5-ton capacity unit combines serious heating performance with solid cooling efficiency, backed by Goodman's reputation for durable, serviceable equipment. At this price point and specification level, it competes directly with mid-range systems from Lennox and Carrier while undercutting premium brands.
Performance-wise, the 97% AFUE furnace with modulating burner is the real story here. That efficiency rating means only 3% of your fuel cost disappears as waste heat up the flue, compared to 15-20% in older units. The 80,000 BTU heating capacity handles most single-family homes, while the air conditioning side delivers 42,000 BTU cooling with 16 SEER1 efficiency. The variable-speed ECM blower motor actively manages airflow rather than running at fixed speeds, reducing electricity draw during partial-load operation.
Pros & Cons
Pros
- 97% AFUE furnace efficiency reduces heating costs versus 80-85% systems by 12-17% annually
- Modulating burner adjusts heat output in real time, eliminating on-off cycling and improving comfort
- Variable-speed ECM blower motor optimizes airflow and reduces electricity consumption
- ENERGY STAR certified air conditioner with 16 SEER1 rating for efficient cooling
- 10-year warranty with online registration provides solid long-term protection
- Scroll compressor is field-proven and widely available for service support
Cons
- Single-stage air conditioner cannot modulate like the furnace, limiting summer efficiency optimization
- 73 dBA noise level runs louder than higher-end variable-capacity systems
- Downflow configuration limits installation flexibility in cramped attics or tight spaces
Who Should Buy
Best For
Homeowners in heating-dominant climates who run furnaces 6-8 months yearly will recoup the higher upfront cost through reduced gas bills within 5-7 years. Contractors who value reliability and easy parts availability also prefer Goodman's established service ecosystem.
Consider Alternatives If
Buyers in mild climates with minimal heating needs won't see adequate ROI, and those seeking top-tier quiet operation should consider higher-end units with variable-capacity compressors.
Installation
The downflow configuration works well in basements and utility closets where ductwork runs beneath the unit. You'll need 115V single-phase power with a 23.5-40 amp breaker, standard in most homes. The A-coil style pairs easily with existing ductwork. PVC exhaust flue is required, and the right-side flue location provides flexibility in equipment room layouts. Most installations take 8-12 hours for experienced crews.
Warranty & Reliability
Goodman backs this system with a 10-year parts warranty when you register online, which takes five minutes. That covers compressor, heat exchanger, and coil failures but excludes wear items like blower motors and capacitors. Registration is critical, as the warranty defaults to five years without it. This coverage is competitive with mid-tier equipment but trails extended plans offered by some competitors.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 80,000 |
| 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 |
| 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 | 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 | 7424271 |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Product Features | Rebate Available |
| Furnace Efficiency / AFUE | 97% |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 1600 |
| Flue Location | Right |
| Burner Stages | Modulating |
| Fuel Type | Propane, Natural Gas |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
Frequently Asked Questions
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