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

      Trane / Mitsubishi Electric PUZ-A42NKA7

      Below average cooling and heating efficiency for a 42,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #30 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $1,229 a year to run in a mixed climate like Atlanta.

      SEER2
      21.5 Cooling efficiency over a season
      Below average · beats 39%
      HSPF2
      9.4 Heating efficiency over a season
      Below average · beats 19%
      EER2
      11.6 Cooling efficiency on a 95°F day
      Below average · beats 14%
      Heat at 5°F
      20,000 BTU/h42% of its 47°F output
      Average · beats 60%

      A good fit if…

      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • 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-A42NKA7
      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 certifiedOctober 17, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better21.5 (range 21.5)
      EER2Efficiency at 95°F outdoors11.6
      Cooling capacity42,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.4
      Capacity at 47°F48,000 BTU/h
      Capacity at 17°F28,000 BTU/h
      Capacity at 5°F20,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.05
      ENERGY STAR cold climateNo
      Heating output as it gets colder42% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TPLA0A0421EA70 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.
      TPLA0A0421EA7021.511.69.420,000206720361
      PLA-A42EA Mitsubishi Electric21.511.69.420,000201754482
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the Trane / Mitsubishi Electric PUZ-A42NKA7: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$927-$3,078

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

      Questions6
      What is the SEER2 rating of the Trane / Mitsubishi Electric PUZ-A42NKA7?
      The Trane / Mitsubishi Electric PUZ-A42NKA7 is rated at up to 21.5 SEER2 and 11.6 EER2 for cooling and up to 9.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Trane / Mitsubishi Electric PUZ-A42NKA7 good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 42,000 BTU model.
      How much does the Trane / Mitsubishi Electric PUZ-A42NKA7 cost to run per year?
      At its rated efficiency it costs about $927-$3,078 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,226 in Phoenix and $2,635 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Trane / Mitsubishi Electric PUZ-A42NKA7 the same as the Trane / Mitsubishi Electric TRUZA0421KA70?
      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 Trane / Mitsubishi Electric PUZ-A42NKA7?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use TPLA0A0421EA70, Mitsubishi Electric PLA-A42EA.
      What refrigerant does the Trane / Mitsubishi Electric PUZ-A42NKA7 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 $1,260/yrYou save $1,004/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-A42NKA7
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,260
      Current system, per year
      $2,264
      You save per year
      $1,004
      Payback
      15.9 years
      Net after 10 years
      -$5,957

      Cooling $688Heating $572Electricity used: 7,872 kWhSaved vs. a minimum-efficiency heat pump: $491

      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 October 17, 2025. How we use the data.