Review
The Goodman 3.5-ton system bridges affordability and performance in the mid-market HVAC category. Marketed as a 3.5-ton unit yet delivering 5-ton cooling capacity with 42,000 BTU output and 80,000 BTU heating, this downflow configuration serves retrofit installations where attic space is limited. Online Supply positions it as an Energy Star qualified option, emphasizing contractor accessibility and rapid deployment for time-sensitive replacement jobs.
Real performance numbers tell the story: the furnace reaches 97% AFUE with a modulating burner that adjusts firing rates to actual heating demand, substantially reducing short-cycling and energy waste. The air conditioner achieves 16 SEER2 rating using R410A refrigerant and scroll compression, outperforming the published 15 SEER specification. Variable-speed ECM motor circulates up to 1,600 CFM, allowing finer temperature control and better dehumidification than single-speed alternatives. Electrical requirements remain modest at 115V single-phase with 23.5 to 40-amp breaker sizing.
Pros & Cons
Pros
- 97% AFUE furnace efficiency with modulating burners reduces fuel consumption and operating costs
- 16 SEER2 cooling efficiency exceeds stated 15 SEER rating, delivering real savings in AC season
- Variable-speed ECM blower motor with 1,600 CFM maximum capacity improves comfort and dehumidification
- Scroll compressor design proven reliable across thousands of residential installations
- 10-year warranty with online registration provides solid protection against manufacturing defects
Cons
- Single-stage condenser limits part-load cooling efficiency compared to variable-capacity competitors
- 73 dB noise level audible during operation, particularly during compressor cycles
- 5-ton cooling capacity oversized for 3.5-ton marketed rating, requiring careful load calculation
Who Should Buy
Best For
Contractors installing replacement systems in established homes where ductwork fits downflow configuration, and homeowners in mixed-climate regions wanting dependable dual-fuel capability (natural gas or propane) without variable-capacity pricing.
Consider Alternatives If
Anyone prioritizing ultra-quiet operation or needing two-stage cooling for minimal part-load cycling should compare inverter-driven alternatives.
Installation
Downflow/horizontal A-coil configuration fits directly above furnace cabinets in tight attic spaces, simplifying retrofit installations. Right-side flue exhausts through PVC or plastic venting, avoiding masonry concerns. Line sets require 3/8-inch liquid and 1 1/8-inch suction connections with 1/2-inch foam insulation up to 50 feet. AHRI certificate 7424271 confirms matched components. Most residential installations complete within one workday for experienced teams.
Warranty & Reliability
Ten-year parts and labor coverage activates upon online registration, protecting against compressor failure, heat exchanger cracks, and blower motor defects. Registration is straightforward and required within 30 days of activation. Coverage excludes maintenance-related wear, improper installation, and damage from refrigerant contamination. This warranty places the unit firmly in contractor-grade territory.
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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