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      12,000 BTU mini-split heat pump · OTERRA

      Daikin RXF12AXVJU

      Below average cooling efficiency and average heating efficiency for a 12,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #332 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $331 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      10.2 Heating efficiency over a season
      Average · beats 53%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Average · beats 44%
      Heat at 5°F
      6,600 BTU/h49% of its 47°F output
      Very good · beats 88%

      A good fit if…

      • 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.
      • Cooling cost matters most - its SEER2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-32
      General
      BrandDaikin
      Outdoor unit modelRXF12AXVJU
      SeriesOTERRA
      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 sinceJanuary 29, 2024
      Last certifiedNovember 20, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 21.0)
      EER2Efficiency at 95°F outdoors12.5
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.2
      Capacity at 47°F13,500 BTU/h
      Capacity at 17°F8,500 BTU/h
      Capacity at 5°F6,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.32
      ENERGY STAR cold climateNo
      Heating output as it gets colder49% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FTXF12AXVJU 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.
      FTXF12AXVJU DAIKIN21.012.510.26,600213895720
      Yearly running cost in 10 large cities$270-$813

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

      Questions5
      What is the SEER2 rating of the Daikin RXF12AXVJU?
      The Daikin RXF12AXVJU is rated at up to 21.0 SEER2 and 12.5 EER2 for cooling and up to 10.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Daikin RXF12AXVJU 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 12,000 BTU model.
      How much does the Daikin RXF12AXVJU cost to run per year?
      At its rated efficiency it costs about $270-$813 a year in electricity in large U.S. cities, depending on climate and local rates - for example $345 in Phoenix and $689 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 Daikin RXF12AXVJU?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DAIKIN FTXF12AXVJU.
      What refrigerant does the Daikin RXF12AXVJU 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 $349/yrYou save $294/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 Daikin RXF12AXVJU
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $349
      Current system, per year
      $643
      You save per year
      $294
      Payback
      15.3 years
      Net after 10 years
      -$1,561

      Cooling $201Heating $148Electricity used: 2,184 kWhSaved vs. a minimum-efficiency heat pump: $148

      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 November 20, 2025. How we use the data.