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      18,000 BTU mini-split heat pump · MMPD Mini-Split

      Lennox MMPD018S6S-1P

      Very good cooling efficiency and below average heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #103 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $505 a year to run in a mixed climate like Atlanta.

      SEER2
      23.8 Cooling efficiency over a season
      Very good · beats 72%
      HSPF2
      9.3 Heating efficiency over a season
      Below average · beats 18%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Average · beats 62%
      Heat at 5°F
      16,000 BTU/h80% of its 47°F output
      Below average · beats 9%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 72% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 16,000 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You mainly need heat - its HSPF2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-32
      General
      BrandLennox
      Also sold asSamsung
      Outdoor unit modelMMPD018S6S-1P
      SeriesMMPD Mini-Split
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceSeptember 27, 2024
      Last certifiedApril 27, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better23.8 (range 16.5-23.8)
      EER2Efficiency at 95°F outdoors10.0-13.0
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.1-9.3
      Capacity at 47°F20,000 BTU/h
      Capacity at 17°F11,600-12,700 BTU/h
      Capacity at 5°F16,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder80% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with M33D018S6-1P 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.
      M33D018S6-1P LENNOX · cold climate23.813.09.316,000215810034
      MDDD018S6-1P LENNOX · cold climate18.010.58.516,000215810037
      MMD018S6-1P LENNOX · cold climate16.510.08.116,000216581336
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the Lennox MMPD018S6S-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$360-$1,280

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

      Questions6
      What is the SEER2 rating of the Lennox MMPD018S6S-1P?
      The Lennox MMPD018S6S-1P is rated at up to 23.8 SEER2 and 13.0 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 3 certified matchups SEER2 ranges from 16.5-23.8.
      Is the Lennox MMPD018S6S-1P good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 16,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the Lennox MMPD018S6S-1P cost to run per year?
      At its rated efficiency it costs about $360-$1,280 a year in electricity in large U.S. cities, depending on climate and local rates - for example $488 in Phoenix and $1,103 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Lennox MMPD018S6S-1P the same as the Samsung AC018DXADCG?
      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 Lennox MMPD018S6S-1P?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use LENNOX M33D018S6-1P, LENNOX MDDD018S6-1P, LENNOX MMD018S6-1P.
      What refrigerant does the Lennox MMPD018S6S-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 $507/yrYou save $454/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 MMPD018S6S-1P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $507
      Current system, per year
      $961
      You save per year
      $454
      Payback
      15.4 years
      Net after 10 years
      -$2,462

      Cooling $266Heating $241Electricity used: 3,169 kWhSaved vs. a minimum-efficiency heat pump: $235

      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 27, 2026. How we use the data.