MUZ-FS18NA
MUZ-FS18NA is in the certified data.
Its certified full-speed heating output at 5°F is 22,400 Btu/h6.56 kW, 118% 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-FS18NA is in the certified data as of Sep 19, 2026.
- 18,000 Btu (1.5-ton)
- Mini-split
- Variable speed
- United States
Certified heating and cooling
Heating at 47°F
19,0005.57NR
No 47°F rating for this pairing.
12,8003.75NR at 17°F
22,4006.56NR at 5°F
Btu/hkW, certified
2.00NR COP at 5°F
Heating and cooling by outdoor temperature
This pairing delivers 19,000 Btu/h5.57 kW of heat at 47°F, 12,800 Btu/h3.75 kW at 17°F, and 22,400 Btu/h6.56 kW at 5°F, 118% of its 47°F rating. It delivers 17,200 Btu/h5.04 kW of cooling at 95°F. At 5°F that is 8,400 Btu/h2.46 kW above the example heating load of 14,000 Btu/h4.10 kW; at 95°F it is 10,200 Btu/h2.99 kW above the example cooling load of 7,000 Btu/h2.05 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 1.5-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 600 sq ft where winters reach 5°F: heating runs from 14,000 Btu/h4.10 kW at 5°F to 0 at 65°F, and cooling runs from 0 at 65°F to 7,000 Btu/h2.05 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 209832207 · 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 | 22,4006.56 kW | +58% | 2.00 | |
| 17°Ffull speed | 12,8003.75 kW | −14% | NR | |
| 47°Fnormal speed | 19,0005.57 kW | +6% | NR | |
| 95°Fcooling, full load | 17,2005.04 kW | — | NR |
EER2 12.5 in that test. SEER2 21.0 over the modeled cooling season.
Power use at each temperature
- Electrical input in the 5°F full-speed test
- 3.28kW
- Electrical input in the 95°F cooling test
- 1.38kW
- Seasonal average heating COP
- 3.14
These exclude backup resistance heat.
How it compares with other 18,000 Btu heat pumps
1.5-ton mini-split models
- This pairing at 5°F
- 22,400 Btu/h6.56 kWNR
- This unit at 5°F median across its pairings
- 22,400 Btu/h6.56 kW
- Median of 1.5-ton mini-split models at 5°F
- 14,200 Btu/h4.16 kW
- Models in this group
- 1,110
This unit is above 97% of them, at number 37 of 1,110 by heat at 5°F. The middle half of the group runs 13,000 to 18,000 Btu/h.
Closest models by heat at 5°F
- D5CPRAH18AAAirquest, Arcoaire + 9 more · 22,600 Btu/h
- MO1SS-H18B-2AMidea · 22,600 Btu/h
- MOD30-18HFN10-M1HMDV · 22,600 Btu/h
- MUZ-FS18NAHAmerican Standard / Mitsubishi Electric, Mitsubishi Electric + 1 more · 22,400 Btu/h
- AOU18RLXFZHFujitsu · 22,000 Btu/h
- AOUH18KWAH2Fujitsu · 22,000 Btu/h
Every 18,000 Btu (1.5-ton) unit, ranked by cooling efficiency, then heating efficiency
Certified values for MUZ-FS18NA
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 | 19,000 Btu/h5.57 kWNR | 19,000 Btu/h5.57 kW |
| Heat output at 17°F full speed | 12,800 Btu/h3.75 kWNR | 12,800 Btu/h3.75 kW |
| Heat output at 5°F full speed | 22,400 Btu/h6.56 kWNR | 22,400 Btu/h6.56 kW |
| Heat output below 5°F | NR | NR |
| Cold output 5°F output as a % of the 47°F rating | 118%NR | |
| COP at 5°F full speed | 2.00NR | 2.00 |
| HSPF2 Region IV | 10.7NR | 10.7 |
| Cooling | ||
| Cooling capacity at 95°F full-load test | 17,200 Btu/h5.04 kWNR | 17,200 Btu/h5.04 kW |
| EER2 at 95°F | 12.5NR | 12.5 |
| SEER2 cooling season | 21.0NR | 21.0 |
| Cooling at other temperatures | NR | NR |
| Equipment and listing | ||
| Refrigerant | R-410A | |
| Compressor | Variable speed | |
| Indoor unit | MSZ-FS18NA*** | 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 | United States | United States |
| Model string as certified | MUZ-FS18NA*** | |
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-FS18NA*** (the pairing on screen) Mitsubishi Electric 22,400 Btu/h6.56 kWat 5°F, full speed
-
NAXWPH18B112A* (the pairing on screen) American Standard / Mitsubishi Electric 22,400 Btu/h6.56 kWat 5°F, full speed
-
NTXWPH18B112A* (the pairing on screen) Trane / Mitsubishi Electric 22,400 Btu/h6.56 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-FS18NA*** (the pairing on screen) | Mitsubishi Electric | 22,4006.56 | 19,0005.57 | 17,2005.04 | 118% | 2.00 | Yes | 1 |
| NAXWPH18B112A* (the pairing on screen) | American Standard / Mitsubishi Electric | 22,4006.56 | 19,0005.57 | 17,2005.04 | 118% | 2.00 | Yes | 1 |
| NTXWPH18B112A* (the pairing on screen) | Trane / Mitsubishi Electric | 22,4006.56 | 19,0005.57 | 17,2005.04 | 118% | 2.00 | 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-FS18NA*** 3 pairings
Variants of the same model number
3 units in this group. Basis: identical certified values in the certified data. This grouping is our inference, not a field in the certified data.
2 of 3 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