Review
Goodman's TX3N4 hits a sweet spot in the entry-to-mid market, pairing a gas furnace and air conditioner as a complete system for under $750. The upflow configuration works in basements and crawlspaces, while PVC exhaust keeps installation straightforward. With Energy Star certification and two-stage operation on both heating and cooling, this unit appeals to budget-conscious buyers without sacrificing fundamental efficiency standards.
The furnace delivers 100,000 BTU heating capacity at 96% AFUE, meaning minimal waste up the flue. Cooling runs at 35,000 BTU with an 18 SEER2 rating, roughly 25% more efficient than 10-year-old units. The ECM multi-speed blower handles up to 1,600 CFM, adjusting output to prevent the short cycles that plague oversized systems. Two-stage operation on both sides means the system ramps down during mild days, extending equipment life.
Pros & Cons
Pros
- 96% AFUE furnace efficiency recovers nearly all fuel energy, translating to lower heating bills for homeowners in cold climates
- 18 SEER2 cooling rating qualifies for Energy Star certification and runs quieter at 71 dB compared to older units
- Multi-speed ECM blower motor adapts to demand, reducing runtime and noise versus single-speed alternatives
- Two-stage burner and two-stage condenser allow modulated operation for better comfort and efficiency
- PVC exhaust flue compatibility simplifies venting in modern homes without masonry chimneys
- 10-year warranty with online registration provides genuine protection for parts and labor
Cons
- 71 dB noise level is moderate, so noise-sensitive homeowners may notice operation during quiet hours
- Weight reaches 2,500 lbs, requiring proper structural support and professional installation equipment
- 3.5-ton actual tonnage runs slightly oversized for a 3-ton nominal rating, which can cause short cycling if not properly commissioned
Who Should Buy
Best For
Homeowners replacing 15+ year old furnace-AC combos in moderate climates and contractors building rental properties or spec homes where upfront cost matters. The 96% AFUE and 18 SEER2 deliver real energy savings without luxury pricing.
Consider Alternatives If
Anyone needing ultra-quiet operation below 68 dB or seeking variable-capacity compressors should explore higher-tier Goodman models or competitors like Lennox.
Installation
Installation requires 208/230V single-phase power with a 21.9 to 35-amp breaker, standard for most homes. The 30-inch height fits typical basement utility spaces. PVC exhaust routing eliminates costly chimney modifications. Weight at 2,500 lbs demands proper framing and handling equipment. Refrigerant line sizing uses 3/8-inch liquid and 7/8-inch suction connections with sweat valve fittings, requiring certified HVAC technicians.
Warranty & Reliability
Goodman backs this unit with a 10-year parts warranty when you register online, typical for the brand and segment. Coverage includes the scroll compressor, heat exchanger, and control board. Labor warranties vary by installer, so confirm terms at purchase. This protection level is respectable but not exceptional compared to premium brands offering 12-year coverage.
Specifications
| SKU | TX3N4 |
| Brand/Manufacturer | Goodman |
| Cooling BTU | 35,000 |
| Heating BTU | 100,000 |
| Refrigerant | R410A |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 71 |
| Weight (in lbs) | 2.500000 |
| Feature | Spec |
| Airflow Direction | Upflow/Horizontal |
| Exhaust Flue Requirement | Plastic / PVC |
| Furnace Efficiency / AFUE | 96% |
| Blower Motor | Multi-Speed - ECM |
| Maximum CFM | 1600 |
| Configuration | Upflow / Downflow |
| Flue Location | Right |
| Energy Star | Yes |
| Burner Stages | Two |
| Fuel Type | 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) | 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 |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Style | A-Coil |
Frequently Asked Questions
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