Review
The Goodman CAPF3743C6 represents solid mid-market positioning for combo gas furnace and air conditioning systems. At $736, this downflow unit targets homeowners seeking balanced efficiency without premium pricing. The product ships as a 3.5-ton condenser paired with an 80,000 BTU furnace, covering both heating and cooling in one integrated system. Goodman's reputation for reliability backs the offering, though specs require careful reading to match expectations.
Heating efficiency is the standout here, with a 96% AFUE rating and two-stage burner that adjusts to actual demand. The AC side delivers 18 SEER2 cooling with a scroll compressor and two-stage condenser operating at 71 dB, quiet enough for residential settings. A variable-speed ECM blower motor cycles intelligently, reducing runtime and noise during partial-load conditions. The 115V single-phase 60 Hz electrical requirement fits standard home circuits, though the 35 amp maximum breaker is on the higher end for older panels.
Pros & Cons
Pros
- 96% AFUE furnace efficiency with dual-stage burner cuts heating costs measurably in winter-heavy climates
- 18 SEER2 cooling rating exceeds the title spec, offering better-than-advertised AC performance
- Variable-speed ECM blower motor adapts to load, improving comfort and reducing energy waste
- Two-stage compressor on the condenser unit provides quieter operation at 71 dB
- Energy Star certified with 10-year warranty via online registration, no hidden catches
Cons
- Title advertises 17 SEER but specs show 18 SEER2, creating minor confusion on marketing accuracy
- 35 amp breaker requirement means some older electrical panels may need upgrades
- Cooling capacity of 35,000 BTU matches 3-ton rating but slightly underperforms the 80,000 BTU heating claim proportionally
Who Should Buy
Best For
Homeowners in northern regions seeking a furnace-heavy system where heating season matters far more than summer cooling. Budget-conscious contractors doing multi-unit residential replacements will appreciate the 10-year warranty and straightforward two-stage design.
Consider Alternatives If
Anyone in hot climates prioritizing AC performance over heating, or customers wanting a single-stage simpler system should compare more basic models.
Installation
This downflow configuration suits basements and tight attic spaces where upflow units won't fit. PVC plastic exhaust flue is required, standard for modern furnaces. Refrigerant lines use 3/8 inch liquid and 7/8 inch suction ports, typical sweat connections requiring soldering skills. Most contractors complete installation in a full day, though electrical upgrades may add cost if your panel lacks adequate capacity.
Warranty & Reliability
The 10-year parts warranty activates with free online registration, a consumer-friendly approach. Coverage includes the furnace, condenser, and evaporator coil. This is substantial protection for a budget-tier system. No labor coverage means you pay service calls out-of-pocket, but ten years of parts replacement provides real safety net for mechanical failures.
Specifications
| SKU | CAPF3743C6 |
| Brand/Manufacturer | Goodman |
| Cooling BTU | 35,000 |
| Heating BTU | 80,000 |
| Refrigerant | R410A or R22 |
| Electrical | 115 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 71 |
| Weight (in lbs) | 63.000000 |
| Feature | Spec |
| Energy Star | Yes |
| SEER1 (Efficiency) | 18 |
| Condenser Stages | Two Stage |
| Compressor Type | Scroll |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 7/8" |
| Max Breaker Size | 35 amps |
| Min. Breaker Size | 21.9 amps |
| Tonnage | 3.5 Ton |
| Valve Type | Sweat |
| 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. |
| AHRI Certificate Number | 7368843 |
| Airflow Direction | Downflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Product Features | Rebate Available |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 1600 |
| Configuration | Upflow / Downflow |
| Burner Stages | Two |
| Fuel Type | Propane, Natural Gas |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Style | A-Coil |
Frequently Asked Questions
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