Review
The Goodman 3.5-ton heat pump system (model HKSC20DB) sits squarely in the contractor's sweet spot, offering proven technology without exotic features or pricing that strains project budgets. With Energy Star certification and a 16 SEER1 rating, this unit competes against mid-range heat pumps from manufacturers like Lennox and Trane. The scroll compressor and single-stage design represent time-tested engineering that installers understand and service technicians can troubleshoot quickly.
Performance specs show 42,000 BTU cooling capacity and 68,200 BTU heating output, addressing moderate residential loads effectively. The variable-speed ECM blower motor delivers up to 1,840 CFM, automatically matching airflow to demand rather than running at constant speed like older models. Running on R410A refrigerant with a 3/8-inch liquid line and 1 1/8-inch suction line, it requires standard field piping. The 73 dB noise level is reasonable for a single-stage compressor, though quieter options exist for noise-sensitive applications.
Pros & Cons
Pros
- 16 SEER1 efficiency rating with Energy Star certification for lower operating costs
- Variable-speed ECM blower motor adjusts airflow from 0 to 1,840 CFM for comfort and efficiency
- Strong heating capacity at 68,200 BTU, making it viable for transitional climates
- Single-stage scroll compressor is proven reliable technology with minimal maintenance
- 10-year warranty with online registration provides solid long-term protection
- Accepts up to 20 kilowatts of electric backup heat for supplemental winter heating
Cons
- Single-stage compressor limits part-load efficiency compared to two-stage or variable-capacity models
- 73 dB noise level is moderately loud, higher than quieter variable-capacity competitors
- No specification for AHRI ratings or SEER2 conversion, making direct comparisons difficult
- Requires 57 to 60 amp breaker on circuit 1, demanding substantial electrical service
Who Should Buy
Best For
Contractors building spec homes in moderate climates and homeowners replacing older systems who prioritize reliability and straightforward installation over cutting-edge technology. Budget-conscious buyers will appreciate the Energy Star rating without premium pricing.
Consider Alternatives If
Anyone in extreme climates needing maximum heating output should explore higher-tonnage or variable-capacity models, and noise-sensitive homeowners should audition units rated below 70 dB.
Installation
Installation demands 208/230/240-volt single-phase power with a dedicated 60-amp primary breaker and 50-amp secondary breaker, necessitating electrical service assessment before ordering. The unit measures 58 inches tall by 24.5 inches wide by 21 inches deep, fitting standard equipment pads. Refrigerant line sets up to 50 feet with 1/2-inch suction line insulation are supported. Sweat valve connections require soldering skills, placing this outside DIY territory.
Warranty & Reliability
Goodman backs this unit with a 10-year parts warranty when you register online within 60 days of installation, covering compressor and sealed components. This is respectable for the price tier, though premium competitors offer 12-year coverage. Warranty claims process is straightforward through Goodman's dealer network, making it accessible for homeowners.
Specifications
| SKU | HKSC20DB |
| Brand/Manufacturer | Goodman |
| Cooling BTU | 42,000 |
| Heating BTU | 68,200 |
| Refrigerant | R410A |
| Electrical | 208 / 230 / 240 Volts / 1 Phase |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 9.000000 |
| Feature | Spec |
| Product Features | Rebate Available |
| 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 | Circuit 1: 60 amps / Circuit 2: 50 amps |
| Min. Breaker Size | Circuit 1: 57 amps / Circuit 2: 50 amps |
| Tonnage | 4 Ton |
| Valve Type | Sweat |
| Height | 58" |
| Width | 24.5" |
| Depth | 21" |
| 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. |
| 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 | 1 1/8" |
| Fuel Type | Electric |
| Suction Line Insulation Thickness | 1/2" |
| Length | 50 feet |
| Electric Heat | 20 Kilowatts |
| Phase | Single Phase |
Frequently Asked Questions
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