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      12,000 BTU mini-split heat pump · MSH Series

      Multi MFG MSH-12HD-B

      Very good cooling and heating efficiency for a 12,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #105 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $266 a year to run in a mixed climate like Atlanta.

      SEER2
      25.0 Cooling efficiency over a season
      Very good · beats 83%
      HSPF2
      11.6 Heating efficiency over a season
      Very good · beats 86%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Average · beats 44%
      Heat at 5°F
      12,000 BTU/h94% of its 47°F output
      Average · beats 48%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 83% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 12,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 86% 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

      Specifications12,000 BTU, R-454B
      General
      BrandMulti MFG
      Outdoor unit modelMSH-12HD-B
      SeriesMSH Series
      TypeMini-split heat pump
      Nominal size12,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 20, 2025
      Last certifiedMay 28, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better25.0 (range 20.0-25.0)
      EER2Efficiency at 95°F outdoors12.0-13.2
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0-11.6
      Capacity at 47°F12,000-12,500 BTU/h
      Capacity at 17°F9,600-12,000 BTU/h
      Capacity at 5°F11,300-12,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder94% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 12FCHP0-C-M-B at the standard test temperatures, in BTU/h:

      Certified matchups5 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.
      12FCHP0-C-M-B · cold climate25.012.510.511,300216760107
      12HWMS0-C-M-B · cold climate24.013.210.511,500216760069
      12CCHP0-C-S-B · cold climate22.212.511.611,500216760080
      12HHHP0-C-M-B · cold climate20.012.010.612,000216760099
      12HCHP0-C-M-B · cold climate20.012.010.011,800216760089
      Yearly running cost in 10 large cities$226-$644

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

      Questions5
      What is the SEER2 rating of the Multi MFG MSH-12HD-B?
      The Multi MFG MSH-12HD-B is rated at up to 25.0 SEER2 and 12.5 EER2 for cooling and up to 11.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 5 certified matchups SEER2 ranges from 20.0-25.0.
      Is the Multi MFG MSH-12HD-B good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 12,000 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Multi MFG MSH-12HD-B cost to run per year?
      At its rated efficiency it costs about $226-$644 a year in electricity in large U.S. cities, depending on climate and local rates - for example $284 in Phoenix and $542 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 Multi MFG MSH-12HD-B?
      ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use 12FCHP0-C-M-B, 12HWMS0-C-M-B, 12CCHP0-C-S-B.
      What refrigerant does the Multi MFG MSH-12HD-B 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 $285/yrYou save $334/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 Multi MFG MSH-12HD-B
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $285
      Current system, per year
      $619
      You save per year
      $334
      Payback
      13.5 years
      Net after 10 years
      -$1,161

      Cooling $169Heating $116Electricity used: 1,780 kWhSaved vs. a minimum-efficiency heat pump: $190

      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 28, 2026. How we use the data.