MUZ-GS12NAHZ
MUZ-GS12NAHZ is in the certified data.
Its certified full-speed heating output at 5°F is 12,300 Btu/h3.60 kW, 100% of its 47°F rating (tests at different compressor speeds) across its certified pairings.
American Standard / Mitsubishi Electric, Mitsubishi Electric + 1 more · mini-split heat pump
MUZ-GS12NAHZ is in the certified data as of Sep 19, 2026.
- 12,000 Btu (1-ton)
- Mini-split
- Variable speed
- US and Canada
Certified heating and cooling
Heating at 47°F
12,3003.60NR
No 47°F rating for this pairing.
7,6002.23NR at 17°F
12,3003.60NR at 5°F
Btu/hkW, certified
1.84NR COP at 5°F
Heating and cooling by outdoor temperature
This pairing delivers 12,300 Btu/h3.60 kW of heat at 47°F, 7,600 Btu/h2.23 kW at 17°F, and 12,300 Btu/h3.60 kW at 5°F, 100% of its 47°F rating. It delivers 12,000 Btu/h3.52 kW of cooling at 95°F. At 5°F that is 3,300 Btu/h0.97 kW above the example heating load of 9,000 Btu/h2.64 kW; at 95°F it is 7,000 Btu/h2.05 kW above the example cooling load of 5,000 Btu/h1.47 kW.
Each bar is a separate certified test, drawn at its outdoor temperature, starting at zero. The 47°F figure is at normal speed; the 17 and 5°F figures are at full speed. The short dark line on each bar is the median of 1-ton mini-split models, one value per model. The shaded 17 to 45°F band is the frosting range: the outdoor coil can frost, and the unit pauses to defrost.
The dashed lines are example loads for a typical area of about 400 sq ft where winters reach 5°F: heating runs from 9,000 Btu/h2.64 kW at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 5,000 Btu/h1.47 kW at 95°F, at 1,000 sq ft per ton. A house in a hot climate or with large west-facing windows can need twice as much cooling. They are examples, not your building.
AHRI certificate 207679253 · listed by Mitsubishi Electric · certified Feb 24, 2025 · 3 pairings on 3 certificates share these values
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Threshold comparisons use the unit’s certified figures across its pairings. Programs also set service-area, installation, and product-list requirements.
Certified output and power use
| Outdoor temperature | Certified outputBtu/h | One scale | vs class median | COPat 5°F |
|---|---|---|---|---|
| 5°Ffull speed | 12,3003.60 kW | +34% | 1.84 | |
| 17°Ffull speed | 7,6002.23 kW | −22% | NR | |
| 47°Fnormal speed | 12,3003.60 kW | +3% | NR | |
| 95°Fcooling, full load | 12,0003.52 kW | — | NR |
EER2 13.05 in that test. SEER2 21.7 over the modeled cooling season.
Power use at each temperature
- Electrical input in the 5°F full-speed test
- 1.96kW
- Electrical input in the 95°F cooling test
- 0.92kW
- Seasonal average heating COP
- 2.81
These exclude backup resistance heat.
How it compares with other 12,000 Btu heat pumps
1-ton mini-split models
- This pairing at 5°F
- 12,300 Btu/h3.60 kWNR
- This unit at 5°F median across its pairings
- 12,300 Btu/h3.60 kW
- Median of 1-ton mini-split models at 5°F
- 9,200 Btu/h2.70 kW
- Models in this group
- 888
This unit is above 92% of them, at number 70 of 888 by heat at 5°F. The middle half of the group runs 8,400 to 11,300 Btu/h.
Closest models by heat at 5°F
- GRXTH12BVJNGoodman · 13,000 Btu/h
- AE-X12CUSharp · 12,700 Btu/h
- AE-X12CPUSharp · 12,500 Btu/h
- MUZ-GX12NLHZMitsubishi Electric · 12,300 Btu/h
- AIRY12HP230V1AOGree · 12,200 Btu/h
- AO-12U3T25PHisense · 12,200 Btu/h
Every 12,000 Btu (1-ton) unit, ranked by cooling efficiency, then heating efficiency
Certified values for MUZ-GS12NAHZ
3 pairings · 3 AHRI certificates
This pairing is the one shown above. Under all pairings, a single figure means every pairing agrees and a range means the pairing decides.
| This pairing | All pairings | |
|---|---|---|
| Heating | ||
| Heat output at 47°F normal speed | 12,300 Btu/h3.60 kWNR | 12,300 Btu/h3.60 kW |
| Heat output at 17°F full speed | 7,600 Btu/h2.23 kWNR | 7,600 Btu/h2.23 kW |
| Heat output at 5°F full speed | 12,300 Btu/h3.60 kWNR | 12,300 Btu/h3.60 kW |
| Heat output below 5°F | NR | NR |
| Cold output 5°F output as a % of the 47°F rating | 100%NR | |
| COP at 5°F full speed | 1.84NR | 1.84 |
| HSPF2 Region IV | 9.6NR | 9.6 |
| Cooling | ||
| Cooling capacity at 95°F full-load test | 12,000 Btu/h3.52 kWNR | 12,000 Btu/h3.52 kW |
| EER2 at 95°F | 13.05NR | 13.05 |
| SEER2 cooling season | 21.7NR | 21.7 |
| Cooling at other temperatures | NR | NR |
| Equipment and listing | ||
| Refrigerant | R-410A | |
| Compressor | Variable speed | |
| Indoor unit | MSZ-GS12NA*** | 3 indoor units |
| Furnace | No furnace | None |
| Cold-climate designation EPA's designation, as published | Yes | On every pairing |
| ENERGY STAR Most Efficient EPA's designation, as published | Yes | On every pairing |
| Where it is sold | US and Canada | US and Canada |
| Model string as certified | MUZ-GS12NAHZ*** | |
Pairings, by indoor-unit class
3 indoor units · 3 certified pairings
One row per indoor unit certified with this outdoor unit.
Ductless indoor · 3 indoor units
-
MSZ-GS12NA*** (the pairing on screen) Mitsubishi Electric 12,300 Btu/h3.60 kWat 5°F, full speed
-
NAXWST12B112** (the pairing on screen) American Standard / Mitsubishi Electric 12,300 Btu/h3.60 kWat 5°F, full speed
-
NTXWST12B112** (the pairing on screen) Trane / Mitsubishi Electric 12,300 Btu/h3.60 kWat 5°F, full speed
| Indoor unit | Brand | At 5°FBtu/hkW · full speed | At 47°FBtu/hkW · normal speed | At 95°FBtu/hkW · cooling | Cold output% of 47°F rating | COP 5°Ffull speed | Cold climate | Pairings |
|---|---|---|---|---|---|---|---|---|
| MSZ-GS12NA*** (the pairing on screen) | Mitsubishi Electric | 12,3003.60 | 12,3003.60 | 12,0003.52 | 100% | 1.84 | Yes | 1 |
| NAXWST12B112** (the pairing on screen) | American Standard / Mitsubishi Electric | 12,3003.60 | 12,3003.60 | 12,0003.52 | 100% | 1.84 | Yes | 1 |
| NTXWST12B112** (the pairing on screen) | Trane / Mitsubishi Electric | 12,3003.60 | 12,3003.60 | 12,0003.52 | 100% | 1.84 | Yes | 1 |
Sold as, and units with identical certified values
Brands listing this model number
- American Standard / Mitsubishi Electric1 pairing
- Mitsubishi Electric1 pairing
- Trane / Mitsubishi Electric1 pairing
Other brands that list these model numbers
- American Standard / Mitsubishi Electric vs Trane / Mitsubishi Electric33 shared model numbers
- American Standard / Mitsubishi Electric vs Mitsubishi Electric24 shared model numbers
- Are Mitsubishi Electric and Trane / Mitsubishi Electric the same?48 shared model numbers
Model number as listed
- MUZ-GS12NAHZ*** 3 pairings
Variants of the same model number
2 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.
1 of 2 shown.
Other model numbers with identical certified values
2 units share this record. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.
1 of 2 shown.
What affects the price
We don't have prices. These things drive the cost.
- The size of the unit, and the indoor equipment on the same certificate.
- Whether existing ductwork is reused, altered, or replaced.
- The electrical work: a circuit, a disconnect, and sometimes a panel change.
- Refrigerant line length and how the outdoor unit is mounted.
- Permits and inspection, which vary by municipality.
- Removing and disposing of the old equipment.
- Local labor rates and how busy the season is.
- Rebates and tax credits, which change and have deadlines.
History and definitions
History
- First certified record
- Most recent certified record
- Measurements reported
- Feb 24, 2025
- Status
- In the certified data
Field definitions
- COP
- Heat delivered for each unit of electricity used. A COP of 2.5 gives 2.5 times the heat of an electric baseboard heater.
- HSPF2
- Heating efficiency over a typical season. Higher uses less electricity.
- SEER2
- Cooling efficiency over a typical season. Higher uses less electricity.
- EER2
- Cooling output divided by electrical input in the 95°F full-load test, in Btu/h per watt.
- Cold output
- Heat output at 5°F as a percentage of the 47°F rating.
- % of rating at 17°F
- Heat output at 17°F as a percentage of the 47°F rating.
NR not in the certified dataNC not cold-climate certifiedSP single pairing onlyVP varies by pairing; see the pairings tableWD withdrawn since the certified data was last read