Review
The Goodman 3 Ton horizontal furnace-AC combination represents the no-frills middle ground of residential HVAC replacement. This system pairs an 80,000 BTU gas furnace with a 36,000 BTU air conditioner in a compact horizontal case designed for tight attic or crawlspace installations. Goodman's reputation centers on affordability and reliability rather than cutting-edge efficiency, making this unit a practical choice for cost-conscious contractors and homeowners facing equipment replacement deadlines.
Performance numbers are straightforward and honest about what you're getting. The 80% AFUE rating means 80 cents of every heating dollar converts to home warmth, leaving 20% lost through the flue, which is respectable for standard efficiency but behind modern condensing furnaces at 95% AFUE. The 13 SEER cooling efficiency is competitive at this price point, delivering adequate summer comfort in moderate climates. A single-stage burner and reciprocating compressor mean simplified operation but no part-load efficiency optimization that variable-capacity systems provide.
Pros & Cons
Pros
- 80,000 BTU heating capacity with 80% AFUE efficiency is standard reliable performance for gas furnaces
- 13 SEER cooling rating delivers respectable air conditioning efficiency without premium pricing
- Horizontal configuration with 27.5-inch height fits cramped attic installations where vertical units won't fit
- Multi-speed PSC blower motor provides flexibility for different ductwork static pressures
- Single-stage burner and compressor design means fewer components to service and lower repair costs
- 10-year warranty with online registration provides adequate coverage for a mid-tier system
Cons
- 80% AFUE is below modern 95%+ standards, costing more to operate than high-efficiency alternatives
- 13 SEER doesn't qualify for ENERGY STAR certification, missing potential rebate programs
- 74 dB noise level is moderately loud during operation, noticeable in living spaces with poor ductwork return
- Single-stage cooling and heating means the system runs full capacity or off, less efficient than two-stage designs
- R410A refrigerant requires certified technicians, adding to future service costs if leaks occur
Who Should Buy
Best For
Contractors upgrading legacy 10-15 year old furnace-AC splits in homes where attic space is severely limited and horizontal mounting is the only option. Homeowners in moderate climates spending less than $5,000 on replacement equipment who prioritize upfront cost savings over reduced operating expenses.
Consider Alternatives If
Homeowners in very cold climates, high-efficiency-focused buyers, and anyone in regions offering substantial rebates tied to 15+ SEER or 90%+ AFUE equipment should compare premium models first.
Installation
Horizontal installation requires adequate clearance in attic or crawlspace with proper support framing for the 30-pound unit. The top flue exit demands metal ducting per code, and you'll need 208/230 volt single-phase power within 30 amps breaker capacity. Sweat-type refrigerant connections use standard 3/8-inch liquid and 7/8-inch suction lines with 3/8-inch insulation thickness. Professional installation by certified technicians is strongly recommended for proper charging and safety compliance.
Warranty & Reliability
Goodman's 10-year parts warranty requires online registration after installation, protecting against manufacturing defects on compressor, heat exchanger, and electrical components. This coverage is standard across the brand's entry-level lineup but significantly shorter than premium manufacturer warranties lasting 12-15 years. Labor warranty details vary by installer, so clarify coverage with your local contractor before purchase.
Specifications
| SKU | LS38783830 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 36,000 |
| Heating BTU | 80,000 |
| Refrigerant | R410A |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 74 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Airflow Direction | Upflow/Horizontal |
| Exhaust Flue Requirement | Metal |
| Furnace Efficiency / AFUE | 80% |
| Blower Motor | Multi Speed - PSC |
| Maximum CFM | 2000 |
| Configuration | Horizontal |
| Flue Location | Top |
| Burner Stages | Single |
| Fuel Type | Gas |
| Height | 27.5" |
| Width | 26" |
| Depth | 26" |
| Resources | Goodman Installation Manual Goodman Specifications Goodman Technical Manual Goodman Warranty Information Goodman Brochure Goodman Service Instructions Goodman Kit Instructions Goodman Parts Manual 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. |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Tonnage | 3 Ton |
| Style | A-Coil |
| 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 |
| Valve Type | Sweat |
| Suction Line Insulation Thickness | 3/8" |
| Length | 30 feet |
Frequently Asked Questions
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