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

      MDV MOX230-09HFN1-BW0Q1W

      Very good cooling and heating efficiency for a 9,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #168 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $222 a year to run in a mixed climate like Atlanta.

      SEER2
      25.0 Cooling efficiency over a season
      Very good · beats 83%
      HSPF2
      10.8 Heating efficiency over a season
      Very good · beats 71%
      EER2
      14.5 Cooling efficiency on a 95°F day
      Very good · beats 88%
      Heat at 5°F
      6,400 BTU/h65% of its 47°F output
      Below average · beats 36%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 83% of mini-splits.
      • It will heat most of the year - its HSPF2 beats 71% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications9,000 BTU, R-410A
      General
      BrandMDV
      Also sold asCoast air
      Outdoor unit modelMOX230-09HFN1-BW0Q1W
      SeriesMSAB series
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceOctober 31, 2022
      Last certifiedMarch 4, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better25.0 (range 25.0)
      EER2Efficiency at 95°F outdoors14.5
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.8
      Capacity at 47°F9,900 BTU/h
      Capacity at 17°F8,000 BTU/h
      Capacity at 5°F6,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.96
      ENERGY STAR cold climateNo
      Heating output as it gets colder65% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSABB-09HRFN1-BW0Q1W 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.
      MSABB-09HRFN1-BW0Q1W25.014.510.86,400209847238
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the MDV MOX230-09HFN1-BW0Q1W: 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$171-$555

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

      Questions6
      What is the SEER2 rating of the MDV MOX230-09HFN1-BW0Q1W?
      The MDV MOX230-09HFN1-BW0Q1W is rated at up to 25.0 SEER2 and 14.5 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the MDV MOX230-09HFN1-BW0Q1W good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 9,000 BTU model.
      How much does the MDV MOX230-09HFN1-BW0Q1W cost to run per year?
      At its rated efficiency it costs about $171-$555 a year in electricity in large U.S. cities, depending on climate and local rates - for example $224 in Phoenix and $474 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the MDV MOX230-09HFN1-BW0Q1W the same as the Coast air A-CAD09-0A?
      Yes, as far as the certified ratings go. ENERGY STAR lists both 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 MDV MOX230-09HFN1-BW0Q1W?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MSABB-09HRFN1-BW0Q1W.
      What refrigerant does the MDV MOX230-09HFN1-BW0Q1W 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 $229/yrYou save $249/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 MOX230-09HFN1-BW0Q1W
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $229
      Current system, per year
      $479
      You save per year
      $249
      Payback
      14.0 years
      Net after 10 years
      -$1,006

      Cooling $127Heating $103Electricity used: 1,434 kWhSaved vs. a minimum-efficiency heat pump: $140

      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 March 4, 2025. How we use the data.