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      12,000 BTU mini-split heat pump · airHome 400

      Hitachi RAC-DJ12WHAA

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

      Ranks #371 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $337 a year to run in a mixed climate like Atlanta.

      SEER2
      19.5 Cooling efficiency over a season
      Below average · beats 12%
      HSPF2
      9.2 Heating efficiency over a season
      Below average · beats 16%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      9,200 BTU/h77% of its 47°F output
      Very good · beats 72%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 9,200 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.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-32
      General
      BrandHitachi
      Outdoor unit modelRAC-DJ12WHAA
      SeriesairHome 400
      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 4, 2026
      Last certifiedMay 6, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.5 (range 19.5)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.2
      Capacity at 47°F12,000 BTU/h
      Capacity at 17°F8,400 BTU/h
      Capacity at 5°F9,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.13
      ENERGY STAR cold climateYes
      Heating output as it gets colder77% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RAK-DJ12PHAA 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.
      RAK-DJ12PHAA · cold climate19.512.09.29,200215224720
      RAK-DJ12RHAA · cold climate19.512.09.29,200216759656
      Yearly running cost in 10 large cities$290-$814

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

      Questions5
      What is the SEER2 rating of the Hitachi RAC-DJ12WHAA?
      The Hitachi RAC-DJ12WHAA is rated at up to 19.5 SEER2 and 12.0 EER2 for cooling and up to 9.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Hitachi RAC-DJ12WHAA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 9,200 BTU/h at 5°F with a COP of 2.13, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the Hitachi RAC-DJ12WHAA cost to run per year?
      At its rated efficiency it costs about $290-$814 a year in electricity in large U.S. cities, depending on climate and local rates - for example $363 in Phoenix and $684 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 Hitachi RAC-DJ12WHAA?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use RAK-DJ12PHAA, RAK-DJ12RHAA.
      What refrigerant does the Hitachi RAC-DJ12WHAA 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 $363/yrYou save $256/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 Hitachi RAC-DJ12WHAA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $363
      Current system, per year
      $619
      You save per year
      $256
      Payback
      17.6 years
      Net after 10 years
      -$1,940

      Cooling $217Heating $146Electricity used: 2,267 kWhSaved vs. a minimum-efficiency heat pump: $112

      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 May 6, 2026. How we use the data.