Review
The Goodman 3-ton variable-speed split system positions itself as the practical choice for cost-conscious homeowners and contractors. Delivering 35,000 BTU of cooling and 68,200 BTU of heating capability, this unit handles mid-sized residential applications effectively. At 18 SEER efficiency with ENERGY STAR certification, it represents a meaningful upgrade path from aging single-stage equipment without premium pricing that approaches high-end rivals.
Performance data shows the ECM variable-speed blower manages airflow at 1,840 CFM maximum, adjusting dynamically to reduce energy waste during partial-load conditions. The two-stage scroll compressor operates at 71 dBA, providing quieter operation than single-stage alternatives during moderate cooling demand. Optional electric heat strips ranging 5kW to 20kW offer flexible retrofit integration for homes transitioning from fossil fuel heat, though the standard unit ships without backup heating.
Pros & Cons
Pros
- 18 SEER efficiency exceeds ENERGY STAR standards, reducing cooling costs by 15-20% versus older systems
- Two-stage condenser with variable-speed ECM blower adapts to load conditions, minimizing short-cycling and noise at 71 dBA
- Scroll compressor technology is proven reliable with lower maintenance needs than rotary designs
- Optional electric backup heat from 5kW to 20kW covers most retrofit applications without additional equipment
- Modest footprint of 35.5" x 35.5" x 38.25" fits standard outdoor pads in tight spaces
Cons
- 18 SEER1 rating trails newer 19-24 SEER2 units by 1-2 efficiency points, narrowing long-term savings gap
- 71 dBA output is audible during peak operation, potentially noticeable in quiet neighborhoods or near bedrooms
- Limited to single-phase 208/240V electrical service, ruling out three-phase commercial applications
Who Should Buy
Best For
Homeowners in warm-to-moderate climates upgrading from 10-13 SEER systems who want measurable efficiency gains without overspending on premium models. Contractors managing replacement projects with tight budgets while maintaining solid equipment reliability and warranty protection.
Consider Alternatives If
Buyers in extreme climates seeking maximum efficiency, those needing three-phase power, or anyone sensitive to operational noise above 68 dBA.
Installation
Installation requires standard refrigeration practices with 3/8-inch liquid line and 7/8-inch suction line connections using sweat fittings. Electrical demands run 208/240V single-phase service with 57-60 amp breakers for circuit one and 50-amp breaker for circuit two. The 9,000-pound weight demands proper outdoor pad preparation, and ducting must accommodate maximum 1,840 CFM without restriction.
Warranty & Reliability
Goodman backs this unit with 10-year full coverage when registered online, a standard industry practice that protects compressor and component failures. Registration is straightforward through Goodman's website and provides coverage documentation for HVAC contractors handling service calls. This warranty duration matches mid-tier competitor offerings but trails premium brands offering 12-15 year terms.
Specifications
| SKU | HKSC20DB |
| Brand/Manufacturer | Goodman |
| Cooling BTU | 35,000 |
| Heating BTU | 68,200 |
| Refrigerant | R410A |
| Electrical | 208 / 230 / 240 Volts / 1 Phase |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 71 |
| Weight (in lbs) | 9.000000 |
| Feature | Spec |
| Blower Motor | Variable Speed - ECM |
| Maximum CFM | 1,840 |
| Electric Backup Heat Capabilities (Optional) | 5 Kilowatts, 8 Kilowatts, 10 Kilowatts, 15 Kilowatts, 20 Kilowatts |
| Filter Size | 23" x 20" |
| Liquid Line | 3/8" |
| Suction Line | 7/8" |
| Max Breaker Size | Circuit 1: 60 amps / Circuit 2: 50 amps |
| Min. Breaker Size | Circuit 1: 57 amps / Circuit 2: 50 amps |
| Tonnage | 3 Ton |
| Fuel Type | Electric |
| Height | 38.25" |
| Width | 35.5" |
| Depth | 35.5" |
| Resources | Goodman Installation Manual Goodman Specifications Goodman Parts Manual Goodman Service Manual Goodman Kit Installation Manual 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. |
| Energy Star | Yes |
| SEER1 (Efficiency) | 18 |
| Condenser Stages | Two Stage |
| Compressor Type | Scroll |
| Liquid Valve Size | 3/8" |
| Suction Valve Size | 7/8" |
| Valve Type | Sweat |
| Electric Heat | 20 Kilowatts |
| Phase | Single Phase |
Frequently Asked Questions
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