HVAC Rated
    Menu

      12,000 BTU mini-split heat pump · AIRSTAGE H series

      Fujitsu AOUH12KMAS1

      Excellent cooling efficiency and very good heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #22 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $293 a year to run in a mixed climate like Atlanta.

      SEER2
      27.5 Cooling efficiency over a season
      Excellent · beats 96%
      HSPF2
      11.2 Heating efficiency over a season
      Very good · beats 79%
      EER2
      13.5 Cooling efficiency on a 95°F day
      Very good · beats 74%
      Heat at 5°F
      10,600 BTU/h76% of its 47°F output
      Excellent · beats 91%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 96% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 10,600 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 79% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-32
      General
      BrandFujitsu
      Outdoor unit modelAOUH12KMAS1
      SeriesAIRSTAGE H series
      TypeMini-split heat pump
      Nominal size12,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceMay 7, 2024
      Last certifiedApril 17, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better27.5 (range 27.5)
      EER2Efficiency at 95°F outdoors13.5
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better11.2
      Capacity at 47°F14,000 BTU/h
      Capacity at 17°F8,700 BTU/h
      Capacity at 5°F10,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.38
      ENERGY STAR cold climateYes
      Heating output as it gets colder76% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with ASUH12KMAS at the standard test temperatures, in BTU/h:

      Certified matchups2 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.
      ASUH12KMAS FUJITSU · cold climate27.513.511.210,600214390708
      ASUH12KMBS FUJITSU · cold climate27.513.511.210,600218381289
      Yearly running cost in 10 large cities$208-$743

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

      Questions5
      What is the SEER2 rating of the Fujitsu AOUH12KMAS1?
      The Fujitsu AOUH12KMAS1 is rated at up to 27.5 SEER2 and 13.5 EER2 for cooling and up to 11.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Fujitsu AOUH12KMAS1 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 10,600 BTU/h at 5°F with a COP of 2.38, so it is still 2.4 times as efficient as electric resistance heat at that temperature.
      How much does the Fujitsu AOUH12KMAS1 cost to run per year?
      At its rated efficiency it costs about $208-$743 a year in electricity in large U.S. cities, depending on climate and local rates - for example $282 in Phoenix and $641 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 Fujitsu AOUH12KMAS1?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use FUJITSU ASUH12KMAS, FUJITSU ASUH12KMBS.
      What refrigerant does the Fujitsu AOUH12KMAS1 use?
      It uses 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 $294/yrYou save $358/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 Fujitsu AOUH12KMAS1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $294
      Current system, per year
      $651
      You save per year
      $358
      Payback
      12.6 years
      Net after 10 years
      -$921

      Cooling $154Heating $140Electricity used: 1,835 kWhSaved vs. a minimum-efficiency heat pump: $211

      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.

      Similar 12,000 BTU models

      See all 394 12,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 17, 2026. How we use the data.