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

      AUX ASW-H24F8A2/*R3DI-C7

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

      Ranks #193 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $603 a year to run in a mixed climate like Atlanta.

      SEER2
      22.0 Cooling efficiency over a season
      Average · beats 48%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      20,800 BTU/h87% 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 20,800 BTU/h at 5°F.
      • 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

      Specifications24,000 BTU, R-32
      General
      BrandAUX
      Also sold asAUFIT
      Outdoor unit modelASW-H24F8A2/*R3DI-C7
      SeriesM-Series
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceJanuary 5, 2026
      Last certifiedJune 25, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better22.0 (range 22.0)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity23,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0
      Capacity at 47°F24,000 BTU/h
      Capacity at 17°F22,400 BTU/h
      Capacity at 5°F20,800 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder87% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with ASW-H24F8A2/*R3DI-C7 at the standard test temperatures, in BTU/h:

      Certified matchups2 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.
      ASW-H24F8A2/*R3DI-C7 · cold climate22.012.010.020,800215405091
      ASW-H24F8A2/*R3DI-C7 AUFIT · cold climate22.012.010.020,800217902884
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the AUX ASW-H24F8A2/*R3DI-C7: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      • AUX ASW-H24F8A2/**R3DI-C7
      Yearly running cost in 10 large cities$494-$1,477

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

      Questions6
      What is the SEER2 rating of the AUX ASW-H24F8A2/*R3DI-C7?
      The AUX ASW-H24F8A2/*R3DI-C7 is rated at up to 22.0 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the AUX ASW-H24F8A2/*R3DI-C7 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,800 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 AUX ASW-H24F8A2/*R3DI-C7 cost to run per year?
      At its rated efficiency it costs about $494-$1,477 a year in electricity in large U.S. cities, depending on climate and local rates - for example $630 in Phoenix and $1,251 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the AUX ASW-H24F8A2/*R3DI-C7 the same as the AUX ASW-H24F8A2/**R3DI-C7?
      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 AUX ASW-H24F8A2/*R3DI-C7?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use ASW-H24F8A2/*R3DI-C7, AUFIT ASW-H24F8A2/*R3DI-C7.
      What refrigerant does the AUX ASW-H24F8A2/*R3DI-C7 use?
      It uses 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 $637/yrYou save $566/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 AUX ASW-H24F8A2/*R3DI-C7
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $637
      Current system, per year
      $1,202
      You save per year
      $566
      Payback
      15.0 years
      Net after 10 years
      -$2,845

      Cooling $368Heating $269Electricity used: 3,980 kWhSaved vs. a minimum-efficiency heat pump: $288

      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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      See all 430 24,000 BTU mini-splits, ranked

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