Review
The Goodman 3 Ton 13 SEER horizontal system occupies a practical middle ground in the residential HVAC market. This unit combines a 96% AFUE gas furnace with a 36,000 BTU/hour air conditioner in a compact downflow configuration designed for tight installation spaces. The horizontal A-coil layout solves a genuine problem for contractors and homeowners facing spatial constraints in attics or basements where traditional vertical systems create clearance issues. Goodman's reputation for straightforward engineering and affordable pricing attracts budget-conscious buyers and volume installers alike.
Performance metrics show solid but unspectacular numbers. The 96% AFUE furnace delivers 100,000 BTU heating output with efficient combustion, while the 13 SEER condenser achieves 36,000 cooling BTU at single-stage compression. The multi-speed blower motor adjusts between 0 and 2000 CFM, allowing technicians to balance airflow for different ductwork configurations. At 74 decibels, the unit runs within acceptable residential noise limits, though not whisper-quiet. Electrical requirements stay modest at 115V, 60 Hz single phase, with breaker sizing between 19.1 and 30 amps, compatible with standard residential panels.
Pros & Cons
Pros
- 96% AFUE furnace efficiency reduces heating costs compared to 80-90% baseline units, translating to $200-400 annual savings in cold climates
- 13 SEER cooling efficiency meets ENERGY STAR eligibility thresholds and qualifies for utility rebates in most regions
- Horizontal downflow configuration fits cramped attic and basement installations where standard units create space conflicts
- Multi-speed blower motor adjusts airflow from 0-2000 CFM, preventing temperature swings and improving comfort consistency
- 10-year parts warranty with online registration provides solid coverage for compressor and heat exchanger failures
Cons
- Single-stage compressor and burner lack modulation, causing efficiency losses during partial-load operation typical in shoulder seasons
- 74 dB noise level runs slightly louder than high-efficiency models, noticeable during cooling cycles in adjacent rooms
- Reciprocating compressor design is less efficient than scroll compressors found in premium Goodman units at comparable price points
Who Should Buy
Best For
Homeowners in zones 4-7 replacing aging 10-13 SEER systems who have space constraints favoring horizontal configuration. Contractors installing in retrofit situations with tight attic clearance or basement placement where standard vertical coils won't fit.
Consider Alternatives If
Buyers in very hot climates needing 14+ SEER cooling, or those seeking variable-speed equipment should explore higher-tier Goodman models or competitors like Lennox or Carrier.
Installation
Installation requires standard refrigerant lines with 3/8 inch liquid and 7/8 inch suction connections, both sweat-type valves. The horizontal configuration demands proper slope for drainage and vibration isolation to minimize noise transmission. PVC flue piping from the right-side exhaust outlet connects to exterior termination. Ductwork connection points need sealing per manual specs. Most experienced HVAC contractors complete installation in 4-6 hours, though first-time horizontal installations may require additional planning time.
Warranty & Reliability
Online Supply provides 10 years of parts coverage upon online registration, protecting compressor and heat exchanger failures. Labor warranty typically runs 1-2 years through installers. Registration is straightforward but mandatory for full coverage activation. This warranty period matches industry standards for mid-tier equipment and offers genuine protection against manufacturing defects.
Specifications
| SKU | LS38783830 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 36,000 |
| Heating BTU | 100,000 |
| Refrigerant | R410A or R22 |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 74 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Replaces | GSX130362, GSX130363, GSX130365 |
| Energy Star | No |
| SEER1 (Efficiency) | 13 |
| Condenser Stages | Single Stage |
| Compressor Type | Reciprocating |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 3/4" |
| Max Breaker Size | 30 amps |
| Min. Breaker Size | 19.1 amps |
| Tonnage | 3.5 Ton |
| Valve Type | Sweat |
| 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 | 7/8" |
| Style | A-Coil |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Multi Speed |
| Maximum CFM | 2000 |
| Flue Location | Right |
| Burner Stages | Single |
| Fuel Type | Gas |
| Suction Line Insulation Thickness | 3/8" |
| Length | 30 feet |
Frequently Asked Questions
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