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      24,000 BTU mini-split heat pump · MSF Series

      Midea MO1AS-H24B-2A

      Below average cooling and heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #422 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $745 a year to run in a mixed climate like Atlanta.

      SEER2
      17.0 Cooling efficiency over a season
      Below average · beats 2%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 2%
      EER2
      9.0 Cooling efficiency on a 95°F day
      Below average · beats 1%
      Heat at 5°F
      17,100 BTU/h71% of its 47°F output
      Average · beats 58%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 17,100 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

      Specifications24,000 BTU, R-454B
      General
      BrandMidea
      Also sold asMDV, Blueridge, Innovair, Mitsutomo, Wells, PerfectAire, KERR, DUCTLESSAIRE
      Outdoor unit modelMO1AS-H24B-2A
      SeriesMSF Series
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceSeptember 5, 2024
      Last certifiedMarch 4, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better17.0 (range 17.0)
      EER2Efficiency at 95°F outdoors9.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5
      Capacity at 47°F24,000 BTU/h
      Capacity at 17°F17,100 BTU/h
      Capacity at 5°F17,100 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.01
      ENERGY STAR cold climateYes
      Heating output as it gets colder71% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSFNS-H24B-2A 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.
      MSFNS-H24B-2A MIDEA · cold climate17.09.08.517,100215471364
      Same unit, other model numbers9

      These model numbers have exactly the same certified ratings and matchups as the Midea MO1AS-H24B-2A: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$664-$1,782

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

      Questions6
      What is the SEER2 rating of the Midea MO1AS-H24B-2A?
      The Midea MO1AS-H24B-2A is rated at up to 17.0 SEER2 and 9.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Midea MO1AS-H24B-2A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 17,100 BTU/h at 5°F with a COP of 2.01, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Midea MO1AS-H24B-2A cost to run per year?
      At its rated efficiency it costs about $664-$1,782 a year in electricity in large U.S. cities, depending on climate and local rates - for example $819 in Phoenix and $1,489 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Midea MO1AS-H24B-2A the same as the MDV MOX430-24HFN10-M1L?
      Yes, as far as the certified ratings go. ENERGY STAR lists 10 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the Midea MO1AS-H24B-2A?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MIDEA MSFNS-H24B-2A.
      What refrigerant does the Midea MO1AS-H24B-2A use?
      It uses R-454B.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $813/yrYou save $424/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 Midea MO1AS-H24B-2A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $813
      Current system, per year
      $1,238
      You save per year
      $424
      Payback
      21.2 years
      Net after 10 years
      -$4,757

      Cooling $497Heating $316Electricity used: 5,082 kWhSaved vs. a minimum-efficiency heat pump: $136

      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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      See all 430 24,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 4, 2025. How we use the data.