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      24,000 BTU mini-split heat pump · MSAB series

      MDV MOD31-23HFN1-MT2Q1W

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

      Ranks #314 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $670 a year to run in a mixed climate like Atlanta.

      SEER2
      20.5 Cooling efficiency over a season
      Below average · beats 24%
      HSPF2
      9.2 Heating efficiency over a season
      Below average · beats 16%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Average · beats 44%
      Heat at 5°F
      18,100 BTU/h62% of its 47°F output
      Very good · beats 84%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,100 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.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications24,000 BTU, R-410A
      General
      BrandMDV
      Also sold asECO-AIR, Alsetria
      Outdoor unit modelMOD31-23HFN1-MT2Q1W
      SeriesMSAB series
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceOctober 12, 2022
      Last certifiedJune 3, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better20.5 (range 16.7-20.5)
      EER2Efficiency at 95°F outdoors11.7-12.5
      Cooling capacity23,000-24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.1-9.2
      Capacity at 47°F24,000-25,000 BTU/h
      Capacity at 17°F17,900-18,000 BTU/h
      Capacity at 5°F15,500-18,100 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.04-2.29
      ENERGY STAR cold climateYes
      Heating output as it gets colder62% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSABE-23HRFN1-MT2Q1W at the standard test temperatures, in BTU/h:

      Certified matchups4 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.
      MSABE-23HRFN1-MT2Q1W20.512.59.215,500207338222
      MSABE-23HRFN1-MT2Q1W ECO-AIR20.512.59.215,500208121857
      MSABE-23HRFN1-MT2Q1W Alsetria20.512.59.215,500208121894
      MVC-23HWFN1-MQ1W · cold climate16.711.79.118,100207785323
      Yearly running cost in 10 large cities$531-$1,658

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

      Questions5
      What is the SEER2 rating of the MDV MOD31-23HFN1-MT2Q1W?
      The MDV MOD31-23HFN1-MT2Q1W is rated at up to 20.5 SEER2 and 12.5 EER2 for cooling and up to 9.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 16.7-20.5.
      Is the MDV MOD31-23HFN1-MT2Q1W good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,100 BTU/h at 5°F with a COP of 2.29, so it is still 2.3 times as efficient as electric resistance heat at that temperature.
      How much does the MDV MOD31-23HFN1-MT2Q1W cost to run per year?
      At its rated efficiency it costs about $531-$1,658 a year in electricity in large U.S. cities, depending on climate and local rates - for example $687 in Phoenix and $1,410 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 MDV MOD31-23HFN1-MT2Q1W?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use MSABE-23HRFN1-MT2Q1W, ECO-AIR MSABE-23HRFN1-MT2Q1W, Alsetria MSABE-23HRFN1-MT2Q1W.
      What refrigerant does the MDV MOD31-23HFN1-MT2Q1W use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and 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 $699/yrYou save $519/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 MDV MOD31-23HFN1-MT2Q1W
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $699
      Current system, per year
      $1,219
      You save per year
      $519
      Payback
      16.4 years
      Net after 10 years
      -$3,306

      Cooling $395Heating $304Electricity used: 4,370 kWhSaved vs. a minimum-efficiency heat pump: $240

      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 June 3, 2026. How we use the data.