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      42,000 BTU mini-split heat pump · P-Series

      Trane / Mitsubishi Electric PUZ-HA42NKA1

      Below average cooling and heating efficiency for a 42,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #58 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $1,467 a year to run in a mixed climate like Atlanta.

      SEER2
      16.3 Cooling efficiency over a season
      Below average · beats 1%
      HSPF2
      9.3 Heating efficiency over a season
      Below average · beats 18%
      EER2
      10.7 Cooling efficiency on a 95°F day
      Below average · beats 7%
      Heat at 5°F
      48,000 BTU/h89% of its 47°F output
      Below average · beats 27%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 48,000 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.
      • You mainly need heat - its HSPF2 is below average for mini-splits.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications42,000 BTU, R-410A
      General
      BrandTrane / Mitsubishi Electric
      Also sold asMitsubishi Electric
      Outdoor unit modelPUZ-HA42NKA1
      SeriesP-Series
      TypeMini-split heat pump
      Nominal size42,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceDecember 1, 2022
      Last certifiedDecember 2, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.3 (range 15.4-16.3)
      EER2Efficiency at 95°F outdoors9.8-10.7
      Cooling capacity42,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.9-9.3
      Capacity at 47°F54,000 BTU/h
      Capacity at 17°F38,500-40,500 BTU/h
      Capacity at 5°F48,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75-1.90
      ENERGY STAR cold climateYes
      Heating output as it gets colder89% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TPLA0A0421EA70A at the standard test temperatures, in BTU/h:

      Certified matchups7 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.
      TPLA0A0421EA70A · cold climate16.310.79.048,000206717862
      PLA-A42EA Mitsubishi Electric · cold climate16.310.79.048,000211273266
      TPCA0A0421KA70A · cold climate15.510.09.048,000206717860
      PCA-A42KA Mitsubishi Electric · cold climate15.510.09.048,000211259280
      TPEADA0421AA · cold climate15.510.48.948,000207702799
      TPVA0A0421AA70A · cold climate15.49.89.348,000206717863
      PVA-A42AA Mitsubishi Electric · cold climate15.49.89.348,000211259282
      Yearly running cost in 10 large cities$1,216-$3,585

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

      Questions5
      What is the SEER2 rating of the Trane / Mitsubishi Electric PUZ-HA42NKA1?
      The Trane / Mitsubishi Electric PUZ-HA42NKA1 is rated at up to 16.3 SEER2 and 10.7 EER2 for cooling and up to 9.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 7 certified matchups SEER2 ranges from 15.4-16.3.
      Is the Trane / Mitsubishi Electric PUZ-HA42NKA1 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 48,000 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the Trane / Mitsubishi Electric PUZ-HA42NKA1 cost to run per year?
      At its rated efficiency it costs about $1,216-$3,585 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,545 in Phoenix and $3,031 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 Trane / Mitsubishi Electric PUZ-HA42NKA1?
      ENERGY STAR lists 7 certified combinations for this outdoor unit. The highest-rated ones use TPLA0A0421EA70A, Mitsubishi Electric PLA-A42EA, TPCA0A0421KA70A.
      What refrigerant does the Trane / Mitsubishi Electric PUZ-HA42NKA1 use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and 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 $1,557/yrYou save $805/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 Trane / Mitsubishi Electric PUZ-HA42NKA1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,557
      Current system, per year
      $2,362
      You save per year
      $805
      Payback
      19.9 years
      Net after 10 years
      -$7,953

      Cooling $907Heating $650Electricity used: 9,733 kWhSaved vs. a minimum-efficiency heat pump: $283

      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 December 2, 2025. How we use the data.