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      12,000 BTU mini-split heat pump · NV-Series

      Trane / Mitsubishi Electric NTXSKH12A112AA

      Below average cooling and heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #346 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $375 a year to run in a mixed climate like Atlanta.

      SEER2
      20.8 Cooling efficiency over a season
      Below average · beats 26%
      HSPF2
      9.5 Heating efficiency over a season
      Below average · beats 24%
      EER2
      12.7 Cooling efficiency on a 95°F day
      Average · beats 54%
      Heat at 5°F
      13,800 BTU/h100% of its 47°F output
      Average · beats 58%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,800 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Cooling cost matters most - its SEER2 is below average for mini-splits.
      • You mainly need heat - its HSPF2 is below average for mini-splits.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-410A
      General
      BrandTrane / Mitsubishi Electric
      Outdoor unit modelNTXSKH12A112AA
      SeriesNV-Series
      TypeMini-split heat pump
      Nominal size12,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceDecember 1, 2022
      Last certifiedJanuary 8, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better20.8 (range 20.0-20.8)
      EER2Efficiency at 95°F outdoors12.7-13.9
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.0-9.5
      Capacity at 47°F13,800-15,000 BTU/h
      Capacity at 17°F8,300-8,900 BTU/h
      Capacity at 5°F6,400-13,800 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.83-2.01
      ENERGY STAR cold climateYes
      Heating output as it gets colder100% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with SLZ-KF12NA at the standard test temperatures, in BTU/h:

      Certified matchups3 indoor units

      The same outdoor unit scores differently with each indoor unit. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      SLZ-KF12NA · cold climate20.812.79.013,800206328151
      NTXAMT12A11220.013.99.56,400211497087
      SVZ-KP12NA20.013.99.56,400206331354
      Yearly running cost in 10 large cities$274-$945

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions5
      What is the SEER2 rating of the Trane / Mitsubishi Electric NTXSKH12A112AA?
      The Trane / Mitsubishi Electric NTXSKH12A112AA is rated at up to 20.8 SEER2 and 12.7 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.0-20.8.
      Is the Trane / Mitsubishi Electric NTXSKH12A112AA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,800 BTU/h at 5°F with a COP of 2.01, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Trane / Mitsubishi Electric NTXSKH12A112AA cost to run per year?
      At its rated efficiency it costs about $274-$945 a year in electricity in large U.S. cities, depending on climate and local rates - for example $368 in Phoenix and $812 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Which indoor units work with the Trane / Mitsubishi Electric NTXSKH12A112AA?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use SLZ-KF12NA, NTXAMT12A112, SVZ-KP12NA.
      What refrigerant does the Trane / Mitsubishi Electric NTXSKH12A112AA use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $380/yrYou save $288/yrSee details ↓
      1. Where you live
      Adjust heating and cooling hours

      Filled in from your city's climate. Change them if you run the system much more or less than usual.

      2. The heat pump Trane / Mitsubishi Electric NTXSKH12A112AA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $380
      Current system, per year
      $668
      You save per year
      $288
      Payback
      15.6 years
      Net after 10 years
      -$1,621

      Cooling $203Heating $177Electricity used: 2,374 kWhSaved vs. a minimum-efficiency heat pump: $139

      Estimates use the unit's rated SEER2 and HSPF2, full-load hours derived from NOAA 1991-2020 degree days, average residential electricity prices from the U.S. EIA (12 months to July 2026) and fuel prices from EIA (2025 for natural gas, week of 2026-10-05 for propane and heating oil). Very cold days that need backup heat are not modelled. Federal minimum for comparison: 14.3 SEER2 / 7.5 HSPF2.

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of January 8, 2026. How we use the data.