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      18,000 BTU mini-split heat pump · MCBU series

      MDV MOX430-17HFN1-MT0W

      Average cooling efficiency and very good heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #195 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $430 a year to run in a mixed climate like Atlanta.

      SEER2
      22.0 Cooling efficiency over a season
      Average · beats 48%
      HSPF2
      11.3 Heating efficiency over a season
      Very good · beats 81%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Average · beats 62%
      Heat at 5°F
      18,000 BTU/h96% of its 47°F output
      Very good · beats 78%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 81% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 28 certified pairings.

      Think twice if…

      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-410A
      General
      BrandMDV
      Also sold asAlsetria, ECO-AIR, DIRECT AIR
      Outdoor unit modelMOX430-17HFN1-MT0W
      SeriesMCBU series
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceDecember 18, 2019
      Last certifiedJune 25, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better22.0 (range 15.2-22.0)
      EER2Efficiency at 95°F outdoors11.0-13.0
      Cooling capacity16,000-18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.9-11.3
      Capacity at 47°F17,000-20,000 BTU/h
      Capacity at 17°F10,900-15,800 BTU/h
      Capacity at 5°F14,600-18,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75-2.20
      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 MSAG11D-18HRFN1-MT8W at the standard test temperatures, in BTU/h:

      Certified matchups28 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.
      MSAG11D-18HRFN1-MT8W · cold climate22.013.010.617,200206361862
      MSEPC-18HRFN1-MU0W · cold climate21.512.511.318,000205993854
      MSEPC-18HRFN1-MU0W ECO-AIR · cold climate21.512.511.318,000208121866
      MSEPC-18HRFN1-MU0W Alsetria · cold climate21.512.511.318,000208121903
      MUEU-18HRFN1-M(C) · cold climate20.512.59.816,800206330130
      MUEU-18HRFN1-M(C) DIRECT AIR · cold climate20.512.59.816,800206377758
      MFA2U-16HRFN1-MV0W · cold climate20.211.08.916,700209248928
      MCA3U-18HRFN1-M(C) · cold climate20.012.59.516,000206330131
      CCA3U-18HRFN1-M(C) DIRECT AIR · cold climate20.012.59.516,000206377759
      CCA3U-18HRFN1-M(C) Alsetria · cold climate20.012.59.516,000211644045
      CCA3U-18HRFN1-M(C) ECO-AIR · cold climate20.012.59.516,000211644070
      MCBU-18HRFN1-MW-CA · cold climate19.812.511.216,700210857292
      MCBU-18HRFN1-MU2W · cold climate19.812.511.216,700209270214
      MCBU-18HRFN1-MU2W ECO-AIR · cold climate19.812.511.216,700211644095
      MCBU-18HRFN1-MU2W Alsetria · cold climate19.812.511.216,700211644101
      CS11M-18HRFN1-MT0W19.412.510.016,400205746254
      CS11M-18HRFN1-MT0W DIRECT AIR19.412.510.016,400205816491
      MTI-18HWFN1-MSP0 · cold climate18.012.110.818,000210299845
      MTIU-24HWFN1-M-CA · cold climate18.012.110.516,000207801583
      MTIU-24HWFN1-M · cold climate18.012.110.516,000207614049
      MTIU-18HWFN1-M · cold climate18.011.79.517,700206330129
      MTIU-18HWFN1-M DIRECT AIR · cold climate18.011.79.517,700206377760
      MTIU-18HWFN1-M Alsetria · cold climate18.011.79.517,700211644039
      MTIU-18HWFN1-M ECO-AIR · cold climate18.011.79.517,700211644064
      MVC-18HWFN1-MW(GA) · cold climate17.611.79.617,000207803596
      MVC-18HWFN1-MW(GA) · cold climate17.611.79.617,000211644106
      MVC-18HWFN1-MW(GA) · cold climate17.611.79.617,000211644112
      MAC-24HWDN1-MN0-N · cold climate15.211.79.514,600210321396
      Yearly running cost in 10 large cities$364-$1,045

      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 MOX430-17HFN1-MT0W?
      The MDV MOX430-17HFN1-MT0W is rated at up to 22.0 SEER2 and 13.0 EER2 for cooling and up to 11.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 28 certified matchups SEER2 ranges from 15.2-22.0.
      Is the MDV MOX430-17HFN1-MT0W good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the MDV MOX430-17HFN1-MT0W cost to run per year?
      At its rated efficiency it costs about $364-$1,045 a year in electricity in large U.S. cities, depending on climate and local rates - for example $459 in Phoenix and $880 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 MOX430-17HFN1-MT0W?
      ENERGY STAR lists 28 certified combinations for this outdoor unit. The highest-rated ones use MSAG11D-18HRFN1-MT8W, MSEPC-18HRFN1-MU0W, ECO-AIR MSEPC-18HRFN1-MU0W.
      What refrigerant does the MDV MOX430-17HFN1-MT0W 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 $460/yrYou save $449/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 MOX430-17HFN1-MT0W
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $460
      Current system, per year
      $909
      You save per year
      $449
      Payback
      14.5 years
      Net after 10 years
      -$2,010

      Cooling $272Heating $188Electricity used: 2,877 kWhSaved vs. a minimum-efficiency heat pump: $242

      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.

      Similar 18,000 BTU models

      See all 465 18,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 25, 2026. How we use the data.