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      42,000 BTU mini-split heat pump · MMPD Multi-Zone

      Lennox MMPD048S6M-1P

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

      Ranks #40 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $1,290 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      9.0 Heating efficiency over a season
      Below average · beats 10%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Below average · beats 16%
      Heat at 5°F
      31,400 BTU/h65% of its 47°F output
      Below average · beats 16%

      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.

      Calculate my running cost

      Details

      Specifications42,000 BTU, R-32
      General
      BrandLennox
      Also sold asSamsung
      Outdoor unit modelMMPD048S6M-1P
      SeriesMMPD Multi-Zone
      TypeMini-split heat pump
      Nominal size42,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceJanuary 1, 2025
      Last certifiedApril 17, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 20.0-21.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity43,000-46,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.6-9.0
      Capacity at 47°F46,500-48,500 BTU/h
      Capacity at 17°F28,400 BTU/h
      Capacity at 5°F31,000-31,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.81
      ENERGY STAR cold climateNo
      Heating output as it gets colder65% kept at 5°F

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

      Certified matchups3 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.
      - LENNOX21.011.79.031,400216760263
      - LENNOX20.511.78.831,200216760271
      - LENNOX20.011.78.631,000216760267
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the Lennox MMPD048S6M-1P: 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$1,004-$3,205

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

      Questions5
      What is the SEER2 rating of the Lennox MMPD048S6M-1P?
      The Lennox MMPD048S6M-1P is rated at up to 21.0 SEER2 and 11.7 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 3 certified matchups SEER2 ranges from 20.0-21.0.
      Is the Lennox MMPD048S6M-1P 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 Lennox MMPD048S6M-1P cost to run per year?
      At its rated efficiency it costs about $1,004-$3,205 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,310 in Phoenix and $2,733 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Lennox MMPD048S6M-1P the same as the Samsung AJ048DXJ5CG?
      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.
      What refrigerant does the Lennox MMPD048S6M-1P 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 $1,337/yrYou save $1,007/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 Lennox MMPD048S6M-1P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,337
      Current system, per year
      $2,344
      You save per year
      $1,007
      Payback
      16.4 years
      Net after 10 years
      -$6,434

      Cooling $746Heating $591Electricity used: 8,356 kWhSaved vs. a minimum-efficiency heat pump: $468

      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 17, 2026. How we use the data.