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      9,000 BTU mini-split heat pump · 45M Series

      Carrier 37MARAQ09AA3

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

      Ranks #115 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $187 a year to run in a mixed climate like Atlanta.

      SEER2
      26.0 Cooling efficiency over a season
      Excellent · beats 91%
      HSPF2
      13.9 Heating efficiency over a season
      Excellent · beats 98%
      EER2
      16.3 Cooling efficiency on a 95°F day
      Excellent · beats 98%
      Heat at 5°F
      8,600 BTU/h96% of its 47°F output
      Excellent · beats 90%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 91% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 8,600 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 98% 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
      BrandCarrier
      Also sold asBryant, Payne, WeatherMaker, Midea
      Outdoor unit model37MARAQ09AA3
      Series45M 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 sinceNovember 15, 2018
      Last certifiedApril 21, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better26.0 (range 19.6-26.0)
      EER2Efficiency at 95°F outdoors12.8-16.3
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better11.0-13.9
      Capacity at 47°F9,000-11,000 BTU/h
      Capacity at 17°F7,900-9,300 BTU/h
      Capacity at 5°F8,000-8,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.17-2.36
      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 45MBFAQ09XA3 at the standard test temperatures, in BTU/h:

      Certified matchups32 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.
      45MBFAQ09XA3 CARRIER · cold climate26.016.313.98,600215323819
      45MBFAQ09XA3 BRYANT · cold climate26.016.313.98,600215323880
      45MBFAQ09XA3 PAYNE · cold climate26.016.313.98,600215323941
      45MBFAQ09XA3 Weathermaker · cold climate26.016.313.98,600215324002
      45MBFAQ09XA3 MIDEA · cold climate26.016.313.98,600215324063
      45MAHAQ09XA3 CARRIER · cold climate26.014.912.58,000215323749
      615AHAQ09XA3 BRYANT · cold climate26.014.912.58,000215323760
      D5MAHAQ09XA3 PAYNE · cold climate26.014.912.58,000215323771
      D5MAHAQ09XA3 Weathermaker · cold climate26.014.912.58,000215323782
      D5MAHAQ09XA3 MIDEA · cold climate26.014.912.58,000215323793
      D5MAHAQ09XA3 BRYANT · cold climate26.014.912.58,000218139569
      D5MAHAQ09XA3 CARRIER · cold climate26.014.912.58,000218139556
      45MCCAQ12XA3 CARRIER · cold climate22.214.411.88,000217542246
      45MCCAQ12XA3 BRYANT · cold climate22.214.411.88,000217542253
      45MCCAQ12XA3 PAYNE · cold climate22.214.411.88,000217542254
      45MCCAQ12XA3 Weathermaker · cold climate22.214.411.88,000217542255
      45MCCAQ12XA3 MIDEA · cold climate22.214.411.88,000217542256
      45MBCAQ12XA3 CARRIER · cold climate21.714.311.38,300215323818
      45MBCAQ12XA3 BRYANT · cold climate21.714.311.38,300215323879
      45MBCAQ12XA3 PAYNE · cold climate21.714.311.38,300215323940
      45MBCAQ12XA3 Weathermaker · cold climate21.714.311.38,300215324001
      45MBCAQ12XA3 MIDEA · cold climate21.714.311.38,300215324062
      45MBDAQ12XH3 CARRIER · cold climate19.813.011.58,300215323821
      45MBDAQ12XH3 BRYANT · cold climate19.813.011.58,300215323882
      45MBDAQ12XH3 PAYNE · cold climate19.813.011.58,300215323943
      45MBDAQ12XH3 Weathermaker · cold climate19.813.011.58,300215324004
      45MBDAQ12XH3 MIDEA · cold climate19.813.011.58,300215324065
      45MBDAQ12XA3 CARRIER · cold climate19.612.811.08,600215323820
      45MBDAQ12XA3 BRYANT · cold climate19.612.811.08,600215323881
      45MBDAQ12XA3 PAYNE · cold climate19.612.811.08,600215323942
      45MBDAQ12XA3 Weathermaker · cold climate19.612.811.08,600215324003
      45MBDAQ12XA3 MIDEA · cold climate19.612.811.08,600215324064
      Yearly running cost in 10 large cities$163-$451

      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 37MARAQ09AA3?
      The Carrier 37MARAQ09AA3 is rated at up to 26.0 SEER2 and 16.3 EER2 for cooling and up to 13.9 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 32 certified matchups SEER2 ranges from 19.6-26.0.
      Is the Carrier 37MARAQ09AA3 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,600 BTU/h at 5°F with a COP of 2.36, so it is still 2.4 times as efficient as electric resistance heat at that temperature.
      How much does the Carrier 37MARAQ09AA3 cost to run per year?
      At its rated efficiency it costs about $163-$451 a year in electricity in large U.S. cities, depending on climate and local rates - for example $203 in Phoenix and $378 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 37MARAQ09AA3?
      ENERGY STAR lists 32 certified combinations for this outdoor unit. The highest-rated ones use CARRIER 45MBFAQ09XA3, BRYANT 45MBFAQ09XA3, PAYNE 45MBFAQ09XA3.
      What refrigerant does the Carrier 37MARAQ09AA3 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 $202/yrYou save $278/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 37MARAQ09AA3
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $202
      Current system, per year
      $480
      You save per year
      $278
      Payback
      12.6 years
      Net after 10 years
      -$720

      Cooling $122Heating $81Electricity used: 1,265 kWhSaved vs. a minimum-efficiency heat pump: $168

      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 9,000 BTU models

      See all 395 9,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 21, 2026. How we use the data.