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      24,000 BTU mini-split heat pump · P series

      Mitsubishi Electric PUZ-AK24NLHZ2

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

      Ranks #124 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $605 a year to run in a mixed climate like Atlanta.

      SEER2
      22.8 Cooling efficiency over a season
      Average · beats 58%
      HSPF2
      10.8 Heating efficiency over a season
      Very good · beats 71%
      EER2
      16.1 Cooling efficiency on a 95°F day
      Excellent · beats 96%
      Heat at 5°F
      26,000 BTU/h100% 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 26,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 71% 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

      Specifications24,000 BTU, R-454B
      General
      BrandMitsubishi Electric
      Outdoor unit modelPUZ-AK24NLHZ2
      SeriesP 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 sinceOctober 1, 2026
      Last certifiedAugust 11, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better22.8 (range 17.0-22.8)
      EER2Efficiency at 95°F outdoors12.1-16.1
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.6-10.8
      Capacity at 47°F25,000-26,000 BTU/h
      Capacity at 17°F16,400-20,800 BTU/h
      Capacity at 5°F25,000-26,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.90-2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder100% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with PLA-AE24NL at the standard test temperatures, in BTU/h:

      Certified matchups9 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.
      PLA-AE24NL · cold climate22.816.110.826,000218697024
      PKA-AK24NL · cold climate21.814.510.126,000218697025
      PCA-AK24NL · cold climate20.014.19.826,000218697026
      PVA-AA24NL · cold climate19.713.69.726,000218697028
      PEAD-AA24NL · cold climate19.313.49.625,000218697027
      PAA-BA24NL · cold climate17.012.19.726,000218697036
      PAA-BA24NL · cold climate17.012.19.726,000218697035
      PAA-AA24NL · cold climate17.012.19.726,000218697034
      PAA-AA24NL · cold climate17.012.19.726,000218697033
      Yearly running cost in 10 large cities$497-$1,483

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

      Questions5
      What is the SEER2 rating of the Mitsubishi Electric PUZ-AK24NLHZ2?
      The Mitsubishi Electric PUZ-AK24NLHZ2 is rated at up to 22.8 SEER2 and 16.1 EER2 for cooling and up to 10.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 9 certified matchups SEER2 ranges from 17.0-22.8.
      Is the Mitsubishi Electric PUZ-AK24NLHZ2 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 26,000 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 Mitsubishi Electric PUZ-AK24NLHZ2 cost to run per year?
      At its rated efficiency it costs about $497-$1,483 a year in electricity in large U.S. cities, depending on climate and local rates - for example $634 in Phoenix and $1,255 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 Mitsubishi Electric PUZ-AK24NLHZ2?
      ENERGY STAR lists 9 certified combinations for this outdoor unit. The highest-rated ones use PLA-AE24NL, PKA-AK24NL, PCA-AK24NL.
      What refrigerant does the Mitsubishi Electric PUZ-AK24NLHZ2 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 $640/yrYou save $630/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 Mitsubishi Electric PUZ-AK24NLHZ2
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $640
      Current system, per year
      $1,270
      You save per year
      $630
      Payback
      14.3 years
      Net after 10 years
      -$2,699

      Cooling $371Heating $270Electricity used: 4,001 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 August 11, 2026. How we use the data.