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

      KEEN Home KEENUMHP24AA

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

      Ranks #320 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $567 a year to run in a mixed climate like Atlanta.

      SEER2
      20.4 Cooling efficiency over a season
      Below average · beats 23%
      HSPF2
      12.1 Heating efficiency over a season
      Excellent · beats 91%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      24,200 BTU/h93% of its 47°F output
      Very good · beats 74%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 24,200 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 91% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Cooling cost matters most - its SEER2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications24,000 BTU, R-454B
      General
      BrandKEEN Home
      Outdoor unit modelKEENUMHP24AA
      SeriesKEEN 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 sinceJuly 4, 2025
      Last certifiedJuly 17, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better20.4 (range 20.4)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity22,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better12.1
      Capacity at 47°F26,000 BTU/h
      Capacity at 17°F20,200 BTU/h
      Capacity at 5°F24,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.16
      ENERGY STAR cold climateYes
      Heating output as it gets colder93% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with KEENFCAH24AA at the standard test temperatures, in BTU/h:

      Certified matchups1 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.
      KEENFCAH24AA · cold climate20.412.012.124,200217596903
      Yearly running cost in 10 large cities$507-$1,357

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

      Questions5
      What is the SEER2 rating of the KEEN Home KEENUMHP24AA?
      The KEEN Home KEENUMHP24AA is rated at up to 20.4 SEER2 and 12.0 EER2 for cooling and up to 12.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the KEEN Home KEENUMHP24AA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 24,200 BTU/h at 5°F with a COP of 2.16, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the KEEN Home KEENUMHP24AA cost to run per year?
      At its rated efficiency it costs about $507-$1,357 a year in electricity in large U.S. cities, depending on climate and local rates - for example $625 in Phoenix and $1,134 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 KEEN Home KEENUMHP24AA?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses KEENFCAH24AA.
      What refrigerant does the KEEN Home KEENUMHP24AA 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 $620/yrYou save $580/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 KEEN Home KEENUMHP24AA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $620
      Current system, per year
      $1,200
      You save per year
      $580
      Payback
      14.7 years
      Net after 10 years
      -$2,704

      Cooling $380Heating $241Electricity used: 3,877 kWhSaved vs. a minimum-efficiency heat pump: $310

      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 24,000 BTU models

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

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 17, 2025. How we use the data.