Review
The Goodman GSZ160421 represents the solid middle ground in residential heat pump condensers. At $2,819, it competes directly with units from Lennox and Carrier in the 16 SEER range, offering contractors a reliable option without premium pricing. Goodman's manufacturing reputation in commercial HVAC translates to residential equipment that handles heavy use without early failure. This unit brings proven scroll compressor technology to a mass-market price point, making it accessible to budget-conscious homeowners and production-volume contractors alike.
Performance specs confirm this is genuine mid-tier equipment. The unit delivers 42,000 BTU for both cooling and heating, matching most 3.5-ton system designs. Its 16 SEER1 rating reflects current efficiency standards, roughly 23 percent better than 13 SEER baseline units from a decade ago. The scroll compressor runs on standard 208/230V single-phase power with a 22.4 to 35-amp breaker range, fitting most residential electrical panels without upgrades. R410A refrigerant compatibility ensures this unit works with modern system designs and won't require transition fluids.
Pros & Cons
Pros
- 16 SEER efficiency rating meets ENERGY STAR standards, reducing operating costs by roughly 20-25% compared to older 13 SEER units
- 42,000 BTU capacity handles 3.5-ton cooling and heating loads, suitable for most single-family homes up to 2,000 square feet
- Single-stage scroll compressor design simplifies troubleshooting and reduces repair complexity versus multi-stage alternatives
- Compact dimensions (36 inches height, 29 by 29 inches footprint) fit standard outdoor unit pads and tight installation spaces
- Rebate eligibility available through manufacturer programs, potentially reducing out-of-pocket cost by $300-500
Cons
- 73 dB noise level is noticeably louder than two-stage competitors, which typically run 65-70 dB and may concern noise-sensitive neighbors
- Single-stage operation cycles on and off more frequently, causing higher compressor wear in very hot or very cold climates
- Sweat valve connections require brazing skills, meaning DIY installation impossible and contractor labor costs higher than push-fit alternatives
Who Should Buy
Best For
Contractors replacing units in moderate climate zones where efficiency matters but variable staging isn't critical, and homeowners upgrading from 13-14 SEER systems looking for straightforward equipment and modest rebates.
Consider Alternatives If
Buyers in extremely hot regions requiring constant cooling, noise-sensitive installations near bedrooms, or homeowners wanting whisper-quiet operation should explore two-stage models costing $300-600 more.
Installation
Installation complexity is moderate. The 3/8-inch liquid valve and 7/8-inch suction valve use sweat connections, requiring a certified technician with brazing equipment and refrigerant recovery certification. The 237-pound weight demands two technicians or mechanical lifting on roofs. Standard pad mounting works for most installations, though vibration isolation pads are recommended to reduce the 73 dB operating noise. Total installation time averages 4-6 hours for experienced crews.
Warranty & Reliability
Goodman includes a standard 10-year parts warranty upon online registration, covering compressor and major components. This is competitive with Lennox and Trane at this price tier. Registration is essential, as warranty voids without proof of purchase. Coverage excludes labor and damage from installation errors, meaning contractor selection matters. Ten years provides reasonable protection for equipment with typical 15-20 year lifespan.
Specifications
| SKU | GSZ160421 |
| Brand/Manufacturer | Goodman |
| Cooling BTU | 42,000 |
| Heating BTU | 42,000 |
| Refrigerant | R410A |
| Electrical | 208 / 230 V. 1 Phase 60 Hz |
| Warranty | 10 Years with Online Registration |
| Decibel Level (dBA) | 73 |
| Weight (in lbs) | 237.000000 |
| 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 | 35 amps |
| Min. Breaker Size | 22.4 amps |
| Tonnage | 3.5 Ton |
| Valve Type | Sweat |
| Height | 36" |
| Width | 29" |
| Depth | 29" |
| Resources | Goodman Specifications Goodman Customer Brochure Goodman Installation Instructions Goodman Kit Instructions Goodman Parts Manual Goodman Service Manual Goodman 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. |
Frequently Asked Questions
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