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      9,000 BTU mini-split heat pump · NV-Series

      Trane / Mitsubishi Electric NTXSKS09A112AA

      Very good cooling efficiency and average heating efficiency for a 9,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #208 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $256 a year to run in a mixed climate like Atlanta.

      SEER2
      24.0 Cooling efficiency over a season
      Very good · beats 75%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      13.4 Cooling efficiency on a 95°F day
      Very good · beats 72%
      Heat at 5°F
      5,200 BTU/h47% of its 47°F output
      Below average · beats 16%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 75% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications9,000 BTU, R-410A
      General
      BrandTrane / Mitsubishi Electric
      Outdoor unit modelNTXSKS09A112AA
      SeriesNV-Series
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceDecember 1, 2022
      Last certifiedMarch 24, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better24.0 (range 24.0)
      EER2Efficiency at 95°F outdoors13.4
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0
      Capacity at 47°F11,000 BTU/h
      Capacity at 17°F6,900 BTU/h
      Capacity at 5°F5,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.81
      ENERGY STAR cold climateNo
      Heating output as it gets colder47% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with SLZ-KF09NA at the standard test temperatures, in BTU/h:

      Certified matchups1 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-KF09NA24.013.410.05,200214236392
      Yearly running cost in 10 large cities$179-$652

      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 NTXSKS09A112AA?
      The Trane / Mitsubishi Electric NTXSKS09A112AA is rated at up to 24.0 SEER2 and 13.4 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Trane / Mitsubishi Electric NTXSKS09A112AA good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 9,000 BTU model.
      How much does the Trane / Mitsubishi Electric NTXSKS09A112AA cost to run per year?
      At its rated efficiency it costs about $179-$652 a year in electricity in large U.S. cities, depending on climate and local rates - for example $245 in Phoenix and $563 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 NTXSKS09A112AA?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses SLZ-KF09NA.
      What refrigerant does the Trane / Mitsubishi Electric NTXSKS09A112AA 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 $255/yrYou save $242/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 NTXSKS09A112AA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $255
      Current system, per year
      $497
      You save per year
      $242
      Payback
      14.5 years
      Net after 10 years
      -$1,084

      Cooling $132Heating $123Electricity used: 1,595 kWhSaved vs. a minimum-efficiency heat pump: $131

      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 March 24, 2026. How we use the data.