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      12,000 BTU mini-split heat pump · ATMOSPHERA

      Daikin RXM12WVJU

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

      Ranks #100 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $304 a year to run in a mixed climate like Atlanta.

      SEER2
      25.2 Cooling efficiency over a season
      Very good · beats 85%
      HSPF2
      10.7 Heating efficiency over a season
      Average · beats 68%
      EER2
      13.2 Cooling efficiency on a 95°F day
      Average · beats 69%
      Heat at 5°F
      13,600 BTU/h100% of its 47°F output
      Below average · beats 9%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 85% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,600 BTU/h at 5°F.
      • 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
      BrandDaikin
      Outdoor unit modelRXM12WVJU
      SeriesATMOSPHERA
      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 sinceSeptember 3, 2025
      Last certifiedSeptember 10, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better25.2 (range 25.2)
      EER2Efficiency at 95°F outdoors13.2
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.7
      Capacity at 47°F13,600 BTU/h
      Capacity at 17°F8,600 BTU/h
      Capacity at 5°F13,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      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 FTXM12WVJU 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.
      FTXM12WVJU DAIKIN · cold climate25.213.210.713,600212494258
      Yearly running cost in 10 large cities$226-$764

      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 RXM12WVJU?
      The Daikin RXM12WVJU is rated at up to 25.2 SEER2 and 13.2 EER2 for cooling and up to 10.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Daikin RXM12WVJU good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,600 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the Daikin RXM12WVJU cost to run per year?
      At its rated efficiency it costs about $226-$764 a year in electricity in large U.S. cities, depending on climate and local rates - for example $301 in Phoenix and $655 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 RXM12WVJU?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses DAIKIN FTXM12WVJU.
      What refrigerant does the Daikin RXM12WVJU 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 $310/yrYou save $335/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 RXM12WVJU
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $310
      Current system, per year
      $645
      You save per year
      $335
      Payback
      13.4 years
      Net after 10 years
      -$1,150

      Cooling $168Heating $142Electricity used: 1,937 kWhSaved vs. a minimum-efficiency heat pump: $189

      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 September 10, 2025. How we use the data.