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      24,000 BTU mini-split heat pump · 45M Series

      Carrier 37MARAQ24AA3

      Average cooling efficiency and very good heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #87 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $558 a year to run in a mixed climate like Atlanta.

      SEER2
      23.1 Cooling efficiency over a season
      Average · beats 66%
      HSPF2
      11.7 Heating efficiency over a season
      Very good · beats 87%
      EER2
      14.0 Cooling efficiency on a 95°F day
      Very good · beats 82%
      Heat at 5°F
      19,600 BTU/h78% of its 47°F output
      Excellent · beats 98%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,600 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 87% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 27 certified pairings.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications24,000 BTU, R-454B
      General
      BrandCarrier
      Also sold asBryant, Payne, WeatherMaker, Midea
      Outdoor unit model37MARAQ24AA3
      Series45M Series
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 15, 2018
      Last certifiedJune 1, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better23.1 (range 19.0-23.1)
      EER2Efficiency at 95°F outdoors11.7-14.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.0-11.7
      Capacity at 47°F24,400-25,000 BTU/h
      Capacity at 17°F17,600-22,400 BTU/h
      Capacity at 5°F18,000-19,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.20-2.54
      ENERGY STAR cold climateYes
      Heating output as it gets colder78% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 45MAHAQ24XA3 at the standard test temperatures, in BTU/h:

      Certified matchups27 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.
      45MAHAQ24XA3 CARRIER · cold climate23.114.011.719,600215323752
      615AHAQ24XA3 BRYANT · cold climate23.114.011.719,600215323763
      D5MAHAQ24XA3 PAYNE · cold climate23.114.011.719,600215323774
      D5MAHAQ24XA3 Weathermaker · cold climate23.114.011.719,600215323785
      D5MAHAQ24XA3 MIDEA · cold climate23.114.011.719,600215323796
      D5MAHAQ24XA3 BRYANT · cold climate23.114.011.719,600218139572
      D5MAHAQ24XA3 CARRIER · cold climate23.114.011.719,600218139559
      45MBCAQ24XA3 CARRIER · cold climate22.112.010.518,500215323833
      45MBCAQ24XA3 BRYANT · cold climate22.112.010.518,500215323894
      45MBCAQ24XA3 MIDEA · cold climate22.112.010.518,500215324077
      45MBCAQ24XA3 PAYNE · cold climate22.112.010.518,500215323955
      45MBCAQ24XA3 Weathermaker · cold climate22.112.010.518,500215324016
      45MCFAQ24XA3 CARRIER · cold climate21.212.211.118,600215323834
      45MCFAQ24XA3 BRYANT · cold climate21.212.211.118,600215323895
      45MCFAQ24XA3 MIDEA · cold climate21.212.211.118,600215324078
      45MCFAQ24XA3 PAYNE · cold climate21.212.211.118,600215323956
      45MCFAQ24XA3 Weathermaker · cold climate21.212.211.118,600215324017
      45MBAAQ24XB3 · cold climate19.811.79.018,000215318768
      45MBAAQ24XB3 · cold climate19.811.79.018,000215318796
      45MBAAQ24XB3 · cold climate19.811.79.018,000215318824
      45MBAAQ24XB3 · cold climate19.811.79.018,000215318880
      45MBAAQ24XB3 · cold climate19.811.79.018,000215318852
      45MBDAQ24XH3 CARRIER · cold climate19.012.511.019,000215323835
      45MBDAQ24XH3 BRYANT · cold climate19.012.511.019,000215323896
      45MBDAQ24XH3 MIDEA · cold climate19.012.511.019,000215324079
      45MBDAQ24XH3 PAYNE · cold climate19.012.511.019,000215323957
      45MBDAQ24XH3 Weathermaker · cold climate19.012.511.019,000215324018
      Yearly running cost in 10 large cities$489-$1,341

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

      Questions5
      What is the SEER2 rating of the Carrier 37MARAQ24AA3?
      The Carrier 37MARAQ24AA3 is rated at up to 23.1 SEER2 and 14.0 EER2 for cooling and up to 11.7 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 27 certified matchups SEER2 ranges from 19.0-23.1.
      Is the Carrier 37MARAQ24AA3 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,600 BTU/h at 5°F with a COP of 2.54, so it is still 2.5 times as efficient as electric resistance heat at that temperature.
      How much does the Carrier 37MARAQ24AA3 cost to run per year?
      At its rated efficiency it costs about $489-$1,341 a year in electricity in large U.S. cities, depending on climate and local rates - for example $607 in Phoenix and $1,124 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 Carrier 37MARAQ24AA3?
      ENERGY STAR lists 27 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MAHAQ24XA3, BRYANT 615AHAQ24XA3, PAYNE D5MAHAQ24XA3.
      What refrigerant does the Carrier 37MARAQ24AA3 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 $605/yrYou save $649/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 Carrier 37MARAQ24AA3
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $605
      Current system, per year
      $1,254
      You save per year
      $649
      Payback
      13.9 years
      Net after 10 years
      -$2,512

      Cooling $366Heating $239Electricity used: 3,781 kWhSaved vs. a minimum-efficiency heat pump: $359

      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 1, 2026. How we use the data.