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      24,000 BTU mini-split heat pump · KUSXB301A

      LG KUSXB301A

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

      Ranks #288 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $816 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      12.1 Cooling efficiency on a 95°F day
      Below average · beats 31%
      Heat at 5°F
      32,000 BTU/h97% 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 32,000 BTU/h at 5°F.
      • 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-32
      General
      BrandLG
      Outdoor unit modelKUSXB301A
      SeriesKUSXB301A
      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 sinceApril 8, 2026
      Last certifiedApril 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 17.0-21.0)
      EER2Efficiency at 95°F outdoors11.0-12.1
      Cooling capacity27,000-30,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5-10.0
      Capacity at 47°F30,000-34,000 BTU/h
      Capacity at 17°F19,000-23,000 BTU/h
      Capacity at 5°F25,000-32,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-2.16
      ENERGY STAR cold climateYes
      Heating output as it gets colder97% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with KNSCB301A at the standard test temperatures, in BTU/h:

      Certified matchups6 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      KNSCB301A · cold climate-21.012.110.032,000214825956
      KNUJB301A · cold climate-18.511.79.430,400214796354
      KNSLB301A · cold climate-17.011.79.630,000215588579
      KNSLB301A · cold climate-17.011.79.630,000217284913
      LKMMA30B1 · cold climateLNA**060B117.011.08.525,000217284961
      LKMMA30B1 · cold climateLNA**080B117.011.08.525,000217284962
      Yearly running cost in 10 large cities$611-$2,046

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

      Questions5
      What is the SEER2 rating of the LG KUSXB301A?
      The LG KUSXB301A is rated at up to 21.0 SEER2 and 12.1 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 6 certified matchups SEER2 ranges from 17.0-21.0.
      Is the LG KUSXB301A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 32,000 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 LG KUSXB301A cost to run per year?
      At its rated efficiency it costs about $611-$2,046 a year in electricity in large U.S. cities, depending on climate and local rates - for example $810 in Phoenix and $1,753 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 LG KUSXB301A?
      ENERGY STAR lists 6 certified combinations for this outdoor unit. The highest-rated ones use KNSCB301A, KNUJB301A, KNSLB301A.
      What refrigerant does the LG KUSXB301A 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 $833/yrYou save $673/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 LG KUSXB301A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $833
      Current system, per year
      $1,507
      You save per year
      $673
      Payback
      14.9 years
      Net after 10 years
      -$3,266

      Cooling $453Heating $381Electricity used: 5,209 kWhSaved vs. a minimum-efficiency heat pump: $339

      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 April 22, 2026. How we use the data.