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Standard
Dependable value for standard heating and cooling
The Goodman GSZC18 offers two-stage heating and cooling with a straightforward control platform. Backed by Goodman's 10-year warranty, it is designed for homes in moderate climates.
HSPF2
9
SEER2
15.5
Min Temp
10°F
Noise
60 dB
Configuration
standard
HSPF2 (Heating Efficiency)
9
Good — federal minimum is 7.5 HSPF2
SEER2 (Cooling Efficiency)
15.5
Good — federal minimum is 14.3 SEER2
Min Operating Temperature
10°F
Operating limit only; verify matched-system capacity at the local design temperature.
Noise Level
60 dB
Catalog sound value; check mode, distance and measurement basis before comparing models.
Compressor Warranty
10 Years
Catalog parts term: 5 years. Registration deadlines and coverage conditions vary; see the exact certificate.
Project Pricing
Calculated for your home
Address, system type, tonnage, zones, and installation scope determine the range
Catalog planning comparison of heating capacity, cooling capacity and COP. Verify each value against the exact manufacturer match before equipment selection.
| Size | Heating @ 47°F | Heating @ 17°F | Heating @ 5°F | Heating @ -5°F | Cooling @ 95°F | COP @ 47°F | COP @ 17°F | COP @ 5°F | COP @ -5°F |
|---|---|---|---|---|---|---|---|---|---|
| 2 Ton | 24,000 BTU/h | 14,400 BTU/h | 10,200 BTU/h | 6,600 BTU/h | 23,500 BTU/h | 3.4 | 2.1 | 1.5 | 1.1 |
| 3 Ton | 36,000 BTU/h | 21,600 BTU/h | 15,300 BTU/h | 9,900 BTU/h | 35,500 BTU/h | 3.3 | 2 | 1.4 | 1 |
| 4 Ton | 47,000 BTU/h | 28,200 BTU/h | 20,000 BTU/h | 12,900 BTU/h | 46,000 BTU/h | 3.2 | 1.9 | 1.3 | 0.9 |
| 5 Ton | 56,000 BTU/h | 33,600 BTU/h | 23,800 BTU/h | 15,400 BTU/h | 55,000 BTU/h | 3.1 | 1.8 | 1.2 | 0.8 |
Product-family catalog values are not an AHRI certificate or a site design. Final equipment selection requires current matched-system documentation.
Our installer-grounded read on the Goodman GSZC18, computed from how its specs compare against the rest of the equipment NuWatt installs.
The Goodman GSZC18 is a mainstream-tier heat pump in the lineup NuWatt installs — a balanced pick when budget matters but you still want a real warranty and proven hardware. Its SEER2 of 15.5 is 3.5 points below the median — fine for cooler-summer regions like coastal Maine, but not the unit we lead with for hot Texas summers. HSPF2 of 9 trails the median by 2.0 — expect higher winter electric usage than the cold-climate leaders. A 10°F minimum operating temperature is the wrong fit for the bulk of NuWatt's territory; we typically pair this kind of unit with backup heat or limit it to milder shoulder-season service.
Selection method: DOE Building America cold-climate sizing guidance. Confirm the exact matched equipment and design heat loss before deciding on backup heat.
The 10°F operating floor means homes in northern Vermont, New Hampshire, and inland Maine will need backup heat for the coldest stretches. Mass Save, Efficiency Maine, and Efficiency Vermont all favor true cold-climate units in their highest rebate tiers, so this product may not unlock the largest incentives. SEER2 of 15.5 sits below the ENERGY STAR threshold of 16, which disqualifies this unit from the headline tiers of most state and utility heat-pump incentive programs (Mass Save, Energize CT, NJ Clean Energy, RI Clean Heat). That can leave thousands of dollars in rebates on the table compared to a higher-efficiency pick. At 60 dB this unit is louder than most condensers we install. On a tight urban lot or against a bedroom wall, that can be the deciding factor.
SEER2
-3.5
vs catalog median
HSPF2
-2.0
vs catalog median
Min temp
+20°F
vs catalog median
Compressor warranty
median
vs catalog median
Rebate amounts vary by equipment and income. See what you qualify for.
Check My Eligibility“The Goodman GSZC18 is the most straightforward install in our lineup. Standard copper linesets, conventional wiring, and universal compatibility with air handlers and thermostats keep the job simple and fast. Often completed in under a day.”
— NuWatt Energy Install Team
A heat pump increases your electricity usage by 3,000–6,000 kWh per year. Offset that cost with solar panels and power your heating with free sunshine. NuWatt designs integrated solar + heat pump systems for maximum savings.
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Installed cost depends on the exact tonnage, number of indoor and outdoor units, ductwork, electrical work, access, and local incentives. Use NuWatt's address-based heat-pump calculator for a preliminary project range; a site visit is required before a firm quote.
The catalog shows 2 to 5 ton options. Do not choose tonnage from floor area alone: use room-by-room Manual J loads, the local design temperature, duct airflow and the exact matched system's heating and cooling capacity. Ask for the sizing calculation and AHRI match with the proposal.
The catalog operating limit is 10°F. That does not prove whole-home heating capacity at that temperature or rule out backup heat. Compare the exact AHRI match and low-temperature output with the home's design heat loss before selecting backup or all-electric operation.
Our catalog lists 10-year compressor and 5-year parts terms. Verify the current manufacturer's certificate for the exact model, registration deadline, location, ownership transfer and maintenance conditions. Parts coverage is not automatically installation-labor coverage; request both terms in writing.
Our catalog lists 9 HSPF2 for heating and 15.5 SEER2 for cooling. These are seasonal ratings, not a guaranteed percentage reduction in your bill. Verify the exact AHRI-rated indoor/outdoor combination and applicable equipment category. Compare low-temperature capacity, the local climate, controls, duct losses and the actual electricity and replacement-fuel rates before estimating operating cost.
Our catalog lists an outdoor sound rating of 60 dB. Compare the exact model's manufacturer sound data using the same operating speed, measurement distance and sound-power or sound-pressure basis. Placement, reflections and nighttime operation affect what you hear; a catalog number alone cannot establish which system will be quietest at your home.
