Review
The Goodman 3.5-ton horizontal gas furnace and air conditioner system lands squarely in the contractor-friendly, value-focused segment of the market. With a 100,000 BTU heating capacity and 42,000 BTU cooling output, this unit handles typical mid-size residential applications reliably. Online Supply positions this as a no-frills workhorse for professionals and homeowners who prioritize proven performance over innovation. Single-stage operation keeps costs down while maintaining industry-standard reliability that contractors have trusted for decades.
Efficiency numbers tell an honest story here. The furnace delivers 96% AFUE, meaning only 4% of fuel escapes unused, placing it well above the 90% minimum many states now require. The air conditioning side produces a 13 SEER rating, respectable but not exceptional by today's standards where 16+ SEER systems are common. The multi-speed blower motor, adjustable from zero to 2000 CFM, lets installers optimize comfort and runtime efficiency for specific installations. These specs represent steady, proven performance rather than best-in-class efficiency.
Pros & Cons
Pros
- 96% AFUE furnace efficiency reduces heating costs compared to older 80% AFUE units
- 13 SEER cooling rating balances efficiency with affordability in mid-range market
- Multi-speed blower motor allows precise airflow control from 0 to 2000 CFM
- Horizontal A-coil configuration suits tight attic or crawlspace installations
- 10-year warranty with online registration provides solid long-term protection
- Single-stage reciprocating compressor uses proven, serviceable technology
Cons
- 13 SEER is dated, SEER2 ratings now standard, so comparison shopping gets tricky
- Single-stage burner and compressor mean less efficiency than two-stage units in mild weather
- 75 dB noise level is noticeably louder than high-end variable-speed systems
- No Energy Star certification limits rebate eligibility in some regions
- Requires 23.9 to 40 amp breaker, standard but verify existing electrical capacity
Who Should Buy
Best For
Contractors working on residential retrofits where space constraints exist and homeowners want proven Goodman reliability without premium pricing. This system suits homes in areas with both heating and cooling demands where the horizontal coil orientation makes installation simpler.
Consider Alternatives If
Buyers seeking ENERGY STAR certification, variable-capacity systems, or the quietest operation should look at competitors like Lennox or Carrier's higher-tier offerings instead.
Installation
This horizontal A-coil configuration installs in tight spaces like attics and crawlspaces where standard upflow models fail. The unit weighs 30 pounds, light enough for one technician to handle. Requires 115V single-phase 60Hz power with 23.9 to 40 amp breaker compatibility. Refrigerant lines use standard 3/8 inch liquid and 7/8 inch suction connections with sweat-valve configuration. Plastic PVC flue exhaust vents through the right side, simplifying ductwork design on many homes.
Warranty & Reliability
Goodman backs this system with a 10-year warranty when you register online after purchase. Coverage includes parts and labor through most authorized dealers, though specific exclusions apply to wear items and improper installation. Ten years provides reasonable protection for residential use. Registration is mandatory to activate this coverage, so don't skip that step after installation.
Specifications
| SKU | LS38783830 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 100,000 |
| Refrigerant | R410A or R22 |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 75 |
| Weight (in lbs) | 30.000000 |
| Feature | Spec |
| Energy Star | No |
| SEER1 (Efficiency) | 13 |
| Condenser Stages | Single Stage |
| Compressor Type | Reciprocating |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Liquid Valve Size | 3/8" |
| Max Breaker Size | 40 amps |
| Min. Breaker Size | 23.9 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 |
| 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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