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

      Midea MO1BS-H24B-2A

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

      Ranks #401 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $696 a year to run in a mixed climate like Atlanta.

      SEER2
      18.5 Cooling efficiency over a season
      Below average · beats 6%
      HSPF2
      9.0 Heating efficiency over a season
      Below average · beats 10%
      EER2
      9.6 Cooling efficiency on a 95°F day
      Below average · beats 4%
      Heat at 5°F
      17,000 BTU/h71% of its 47°F output
      Very good · beats 71%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 17,000 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 asBlueridge, ZERO, AI AIR CONDITIONING, TRUST AIR CONDITIONERS, Mitsutomo, SLIMAIR, Elios, ECO-AIR, Sea Breeze, NG Trade, EMI, Capella, Stelpro, Bluefin
      Outdoor unit modelMO1BS-H24B-2A
      SeriesMSG 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 certifiedMay 6, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.5 (range 18.5)
      EER2Efficiency at 95°F outdoors9.6
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.0
      Capacity at 47°F24,000 BTU/h
      Capacity at 17°F20,800 BTU/h
      Capacity at 5°F17,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.11
      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 MSGNS-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.
      MSGNS-H24B-2A MIDEA · cold climate18.59.69.017,000215471370
      Same unit, other model numbers15

      These model numbers have exactly the same certified ratings and matchups as the Midea MO1BS-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$610-$1,674

      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 MO1BS-H24B-2A?
      The Midea MO1BS-H24B-2A is rated at up to 18.5 SEER2 and 9.6 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Midea MO1BS-H24B-2A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 17,000 BTU/h at 5°F with a COP of 2.11, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the Midea MO1BS-H24B-2A cost to run per year?
      At its rated efficiency it costs about $610-$1,674 a year in electricity in large U.S. cities, depending on climate and local rates - for example $758 in Phoenix and $1,403 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Midea MO1BS-H24B-2A the same as the Blueridge BMS2419YC?
      Yes, as far as the certified ratings go. ENERGY STAR lists 16 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 MO1BS-H24B-2A?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MIDEA MSGNS-H24B-2A.
      What refrigerant does the Midea MO1BS-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 $755/yrYou save $482/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 MO1BS-H24B-2A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $755
      Current system, per year
      $1,238
      You save per year
      $482
      Payback
      18.7 years
      Net after 10 years
      -$4,178

      Cooling $457Heating $299Electricity used: 4,721 kWhSaved vs. a minimum-efficiency heat pump: $194

      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.