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      15,000 BTU mini-split heat pump · M-Series

      Mitsubishi Electric MUZ-GS15NAH

      Below average cooling efficiency and average heating efficiency for a 15,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #39 of 62 15,000 BTU mini-splits for cooling efficiency, and costs about $418 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      10.4 Heating efficiency over a season
      Average · beats 57%
      EER2
      12.8 Cooling efficiency on a 95°F day
      Average · beats 55%
      Heat at 5°F
      14,000 BTU/h78% of its 47°F output
      Average · beats 59%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 14,000 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 want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications15,000 BTU, R-410A
      General
      BrandMitsubishi Electric
      Outdoor unit modelMUZ-GS15NAH
      SeriesM-Series
      TypeMini-split heat pump
      Nominal size15,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceNovember 21, 2022
      Last certifiedApril 7, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 21.0)
      EER2Efficiency at 95°F outdoors12.8
      Cooling capacity14,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.4
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F12,100 BTU/h
      Capacity at 5°F14,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.03
      ENERGY STAR cold climateYes
      Heating output as it gets colder78% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MSZ-GS15NA 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.
      MSZ-GS15NA · cold climate21.012.810.414,000207679249
      Yearly running cost in 10 large cities$316-$1,044

      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 MUZ-GS15NAH?
      The Mitsubishi Electric MUZ-GS15NAH is rated at up to 21.0 SEER2 and 12.8 EER2 for cooling and up to 10.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Mitsubishi Electric MUZ-GS15NAH good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,000 BTU/h at 5°F with a COP of 2.03, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Mitsubishi Electric MUZ-GS15NAH cost to run per year?
      At its rated efficiency it costs about $316-$1,044 a year in electricity in large U.S. cities, depending on climate and local rates - for example $417 in Phoenix and $894 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 MUZ-GS15NAH?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses MSZ-GS15NA.
      What refrigerant does the Mitsubishi Electric MUZ-GS15NAH 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 $429/yrYou save $359/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 MUZ-GS15NAH
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $429
      Current system, per year
      $787
      You save per year
      $359
      Payback
      15.3 years
      Net after 10 years
      -$1,912

      Cooling $235Heating $194Electricity used: 2,678 kWhSaved vs. a minimum-efficiency heat pump: $185

      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 7, 2025. How we use the data.