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We serve MA, NH, CT, RI, ME, VT, NJ, PA, and TX
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Standard
Dependable value for standard heating and cooling
The Goodman GSZC18 is the most affordable heat pump in our lineup, offering reliable two-stage heating and cooling at the lowest installed price. Backed by Goodman's 10-year warranty, it's a no-frills workhorse for homes in moderate climates.
HSPF2
9
SEER2
15.5
Min Temp
10°F
Noise
60 dB
Installed
$3,500–$8,500
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
Mild climate only — supplemental heat needed below freezing
Noise Level
60 dB
Standard — audible but typical for HVAC equipment
Compressor Warranty
10 Years
5-year parts warranty — register within 90 days of install
Installed Price Range
$3,500–$8,500
Includes equipment, labor, and permits — varies by size and complexity
Heating capacity, cooling capacity, and COP at standard AHRI test temperatures
| 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 | Est. Price |
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | $3,500 |
| 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 | $5,167 |
| 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 | $6,833 |
| 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 | $8,500 |
Capacity and COP values based on manufacturer-published data at AHRI standard conditions. Installed prices are estimates and may vary.
“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
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The Goodman GSZC18 costs between $3,500 and $8,500 fully installed by NuWatt Energy. The final price depends on your home’s size, the tonnage you need, and installation complexity. Note that the federal 25C heat pump tax credit expired at the end of 2025, so there is no federal credit available in 2026. However, state rebates and utility incentives may still apply.
The Goodman GSZC18 is available in 4 sizes from 2 to 5 ton. A general guideline is 1 ton per 500–600 square feet, but proper sizing depends on your home’s insulation, climate zone, and layout. NuWatt performs a Manual J load calculation during your free consultation to determine the exact size.
The Goodman GSZC18 operates down to 10°F, which covers many areas of southern New England (CT, RI, coastal MA). For northern NH, VT, or ME where temps regularly dip below 0°F, we recommend a cold-climate rated model like the Mitsubishi Hyper-Heat or Carrier Greenspeed instead.
The Goodman GSZC18 comes with a 10-year compressor warranty and a 5-year parts warranty. NuWatt also provides our own workmanship warranty covering installation labor. Be sure to register your product with Goodman within 90 days of installation to activate the full warranty.
The Goodman GSZC18 has an HSPF2 of 9 (heating) and SEER2 of 15.5 (cooling). For context, the minimum federal standard is 7.5 HSPF2 and 14.3 SEER2, so this unit is 20% more efficient for heating and 8% more efficient for cooling than the baseline. Higher efficiency means lower monthly energy bills.
The outdoor unit operates at 60 dB, which is moderate — comparable to background music or normal conversation levels. For comparison, the quietest unit in our lineup is 49 dB (Fujitsu Halcyon) and the loudest is 60 dB (Goodman GSZC18).
