Review
Goodman's 4-ton upflow gas furnace and air conditioner system positions itself squarely in the accessible mid-market segment. The unit combines an 80% AFUE furnace delivering 100,000 BTU heating output with a 16 SEER condenser rated for 45,500 BTU cooling. This Energy Star certified pairing appeals to homeowners seeking certified efficiency improvements without paying for premium variable-capacity technology. The system replaces the previous GSX16S481 model and maintains Goodman's reputation for straightforward, proven designs.
Performance metrics show solid real-world capability. The high-efficiency multi-speed blower motor reaches 2000 CFM maximum, enabling better temperature distribution than fixed-speed alternatives. The two-stage furnace burner cycles between capacity levels rather than on-off operation, reducing short-cycling and improving heating comfort. The scroll compressor with R410A refrigerant handles cooling loads reliably in moderate climates. However, the single-stage condenser design means full cooling capacity operates regardless of outdoor temperature, preventing the efficiency gains variable systems offer.
Pros & Cons
Pros
- 16 SEER air conditioner rating exceeds baseline efficiency requirements and qualifies for Energy Star status
- High-efficiency multi-speed blower motor improves comfort by reducing temperature swings and cycling frequency
- Two-stage burner on furnace provides better modulation during partial load conditions, reducing short-cycling
- Compact A-coil design fits tight spaces, with only 30 inches of height and 21-inch width and depth
- 10-year parts warranty with online registration offers solid peace of mind without premium tier costs
Cons
- 80% AFUE furnace lags behind high-efficiency 95%+ models, costing more to operate over 15-year lifespan
- Single-stage condenser cannot adjust cooling capacity, limiting ability to handle temperature swings efficiently
- 73 dB noise level is moderately loud during operation, noticeable in quiet neighborhoods or open-concept homes
Who Should Buy
Best For
Homeowners in transitional markets replacing 10-15 year old single-stage systems who value reliability over cutting-edge efficiency metrics. Contractors needing a trustworthy mid-market option for replacement jobs where a furnace change-out is also required.
Consider Alternatives If
Buyers in very hot climates requiring aggressive cooling capacity should compare 5-ton alternatives, and those focused on lowest operating costs over time should invest in 95%+ AFUE furnaces.
Installation
Installation requires metal exhaust flue compatibility and 208/230V single-phase 60Hz electrical supply. The compact 30-inch height and 21-inch width fit standard upflow and horizontal orientations in tight spaces. Minimum 23.9-amp breaker sizing accommodates most existing residential panels, though a 40-amp breaker slot ensures future flexibility. Suction line insulation thickness measures 1/2 inch, and lines extend 50 feet maximum.
Warranty & Reliability
Online registration activates a 10-year parts warranty covering furnace and air conditioner components. This warranty period meets industry standard expectations without requiring extended protection plans. The evaporator coil carries separate Goodman coverage. Registration is straightforward and essential for claim eligibility.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 45,500 |
| Heating BTU | 100,000 |
| Refrigerant | R410A |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 48.000000 |
| Feature | Spec |
| Airflow Direction | Upflow/Horizontal |
| Exhaust Flue Requirement | Metal |
| Furnace Efficiency / AFUE | 80% |
| Blower Motor | High Efficiency Multi-Speed |
| Maximum CFM | 2000 |
| Configuration | Upflow / Downflow |
| Burner Stages | Two |
| Fuel Type | Gas |
| Height | 30" |
| Width | 21" |
| Depth | 21" |
| Resources | CAPT Installation Manual CAPT Specifications Sheet Goodman Evaporator Coil 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. |
| Replaces | GSX16S481 |
| 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 | 23.9 amps |
| Tonnage | 5 Ton |
| Liquid Line | 3/8" |
| Suction Line | 1 1/8" |
| Style | A-Coil |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
Frequently Asked Questions
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