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      9,000 BTU mini-split heat pump · MSAG series

      MDV MOX330-09HFN10-M1X

      Excellent cooling and heating efficiency for a 9,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #58 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $184 a year to run in a mixed climate like Atlanta.

      SEER2
      27.5 Cooling efficiency over a season
      Excellent · beats 96%
      HSPF2
      13.8 Heating efficiency over a season
      Excellent · beats 97%
      EER2
      15.5 Cooling efficiency on a 95°F day
      Excellent · beats 94%
      Heat at 5°F
      11,900 BTU/h96% of its 47°F output
      Below average · beats 22%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 96% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 11,900 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 97% of mini-splits.
      • 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

      Specifications9,000 BTU, R-454B
      General
      BrandMDV
      Outdoor unit modelMOX330-09HFN10-M1X
      SeriesMSAG series
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 4, 2024
      Last certifiedMay 6, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better27.5 (range 20.5-27.5)
      EER2Efficiency at 95°F outdoors13.4-15.5
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.9-13.8
      Capacity at 47°F9,000-12,000 BTU/h
      Capacity at 17°F9,000-12,000 BTU/h
      Capacity at 5°F10,600-11,900 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.89
      ENERGY STAR cold climateYes
      Heating output as it gets colder96% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSEPB-09HRFN10-M1 at the standard test temperatures, in BTU/h:

      Certified matchups25 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.
      MSEPB-09HRFN10-M1 · cold climate27.515.512.511,500214311110
      MSEPBM-12HRFN10-M1 · cold climate27.515.512.511,500214311111
      MSEPB-09HRFN10-M1-D · cold climate27.415.412.511,500214855559
      MFA2-09HRFN10-M1 · cold climate27.315.210.911,300214855407
      MFA2M-12HRFN10-M1 · cold climate27.315.210.911,300214855408
      MFA2M-12HRFN10-M1-D · cold climate27.215.110.911,300214855508
      MFA2-09HRFN10-M1-D · cold climate27.215.110.911,300214855562
      MSAG11B-09HRFN10-M1 · cold climate26.015.012.511,500214311107
      MSAG11BM-12HRFN10-M1 · cold climate26.015.012.511,500214311108
      MCB-09HRFN10-M1 · cold climate24.014.712.210,600214855403
      MCBM-12HRFN10-M1 · cold climate24.014.712.210,600214855404
      MCB-09HRFN10-M1-D · cold climate24.014.612.110,600214855506
      MCBM-12HRFN10-M1-D · cold climate24.014.612.110,600214855560
      MCA4-09HRFN10-M1 · cold climate22.714.012.211,000214855405
      MCA4M-12HRFN10-M1 · cold climate22.714.012.211,000214855406
      MCA4-09HRFN10-M1-D · cold climate22.614.012.111,000214855507
      MCA4M-12HRFN10-M1-D · cold climate22.614.012.111,000214855561
      MTI-09HWFN10-M1 · cold climate21.513.512.511,200214855409
      MTIM-12HWFN10-M1 · cold climate21.513.512.511,200214861924
      MTI-09HWFN10-M1-D · cold climate21.413.412.511,200214861936
      MTIM-12HWFN10-M1-D · cold climate21.413.412.511,200214861937
      MTJ-09HWFN10-M1 · cold climate20.614.013.811,900214861925
      MTJM-12HWFN10-M1 · cold climate20.614.013.811,900214861926
      MTJ-09HWFN10-M1-D · cold climate20.514.013.811,900214861938
      MTJM-12HWFN10-M1-D · cold climate20.514.013.811,900214861939
      Yearly running cost in 10 large cities$154-$449

      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 MOX330-09HFN10-M1X?
      The MDV MOX330-09HFN10-M1X is rated at up to 27.5 SEER2 and 15.5 EER2 for cooling and up to 13.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 25 certified matchups SEER2 ranges from 20.5-27.5.
      Is the MDV MOX330-09HFN10-M1X good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 11,900 BTU/h at 5°F with a COP of 1.89, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the MDV MOX330-09HFN10-M1X cost to run per year?
      At its rated efficiency it costs about $154-$449 a year in electricity in large U.S. cities, depending on climate and local rates - for example $195 in Phoenix and $379 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 MOX330-09HFN10-M1X?
      ENERGY STAR lists 25 certified combinations for this outdoor unit. The highest-rated ones use MSEPB-09HRFN10-M1, MSEPBM-12HRFN10-M1, MSEPB-09HRFN10-M1-D.
      What refrigerant does the MDV MOX330-09HFN10-M1X 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 $196/yrYou save $284/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 MOX330-09HFN10-M1X
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $196
      Current system, per year
      $480
      You save per year
      $284
      Payback
      12.3 years
      Net after 10 years
      -$659

      Cooling $115Heating $81Electricity used: 1,227 kWhSaved vs. a minimum-efficiency heat pump: $175

      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.