Review
The Goodman 3.5-ton downflow furnace with air conditioner system represents a solid middle-ground choice for contractors and homeowners seeking efficiency without premium pricing. Branded through Online Supply and certified under AHRI #7424271, this unit emphasizes modulating heating and variable-speed blower technology. At 97% AFUE and ENERGY STAR certified, it competes respectably against mid-tier alternatives while maintaining familiar Goodman reliability and serviceability in the field.
Performance metrics show a 97% AFUE furnace with 80,000 BTU heating output paired to a 42,000 BTU cooling section (SEER 16). The modulating burner stages fuel input to match demand, while the ECM variable-speed blower optimizes CFM from 0 to 1,600. Sound output reaches 73 dBA at rated capacity. Refrigerant options include R410A or R22, with 3/8 inch liquid and 1 1/8 inch suction lines over 50 feet maximum length.
Pros & Cons
Pros
- 97% AFUE furnace efficiency means minimal heat waste compared to standard 80-85% units
- Modulating burner automatically adjusts heat output to match demand, reducing short-cycling and improving comfort
- Variable-speed ECM blower can scale airflow between 0 and 1,600 CFM, lowering electrical draw during partial load operation
- PVC exhaust compatibility simplifies venting in retrofit applications and reduces installation cost
- 10-year warranty with online registration provides solid protection for both parts and labor
Cons
- SEER rating spec shows conflicting data: title claims 15 SEER but specs list 16 SEER1, creating confusion about actual cooling efficiency
- Single-stage condenser means the outdoor unit doesn't modulate, limiting part-load cooling efficiency and comfort in shoulder seasons
- Tonnage mismatch exists: furnace delivers 80,000 BTU (6.7 tons) while system is marketed as 3.5-ton with 42,000 BTU cooling capacity
Who Should Buy
Best For
Contractors building new systems in cold climates or replacing furnaces in existing homes where PVC venting is feasible. Homeowners in gas service areas who prioritize heating efficiency and want measurable energy savings without spending on high-end two-stage equipment.
Consider Alternatives If
Anyone needing balanced cooling capacity should look elsewhere, since this 3.5-ton system pairs unequal heating and cooling BTU output. Those in very humid climates benefit more from two-stage condensers.
Installation
This downflow unit measures 30 inches tall by 21 inches wide and deep, fitting standard mechanical closets and attic spaces. PVC exhaust flue requirement simplifies venting through exterior walls. Right-side flue outlet allows flexible ductwork routing. Electrical demand runs 208/230V single-phase 60Hz with 23.5 to 40 amp breaker sizing. Variable-speed blower integration requires compatible thermostat or control module for full modulation capability.
Warranty & Reliability
Goodman covers this system for 10 years on parts and labor when registered online within 30 days of installation. Compressor and evaporator coil receive additional coverage under Goodman's extended warranty program. Registration is straightforward but required to activate full protection, so contractors should confirm homeowner completion before final billing.
Specifications
| SKU | LS381183850 |
| Brand/Manufacturer | Online Supply |
| Cooling BTU | 42,000 |
| Heating BTU | 80,000 |
| Refrigerant | R410A or R22 |
| 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 |
| 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 |
| Configuration | Upflow / Downflow |
| Flue Location | Right |
| Energy Star | Yes |
| Burner Stages | Modulating |
| Fuel Type | Propane, Natural Gas |
| Height | 30" |
| Width | 21" |
| Depth | 21" |
| Resources | CAPF Installation Manual CAPF 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. |
| 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 |
| 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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