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      5-ton central heat pump · Merit ML16KP2 SERIES

      Lennox ML16KP2-060-230A

      Below average cooling and heating efficiency for a 5-ton central heat pump, but not rated for cold climates.

      Ranks #61 of 100 5 ton central heat pumps for cooling efficiency, and costs about $1,884 a year to run in a mixed climate like Atlanta.

      SEER2
      15.8 Cooling efficiency over a season
      Below average · beats 18%
      HSPF2
      7.8 Heating efficiency over a season
      Below average · beats 5%
      EER2
      12.2 Cooling efficiency on a 95°F day
      Very good · beats 75%
      Heat at 5°F
      27,800 BTU/h51% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want a certified 5-ton central heat pump at a typical efficiency level.

      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 central heat pumps.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications5 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelML16KP2-060-230A
      SeriesMerit ML16KP2 SERIES
      TypeCentral heat pump
      Nominal size5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceMay 13, 2026
      Last certifiedJuly 17, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better15.8 (range 15.5-15.8)
      EER2Efficiency at 95°F outdoors12.0-12.2
      Cooling capacity57,500-58,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8
      Capacity at 47°F53,500-54,500 BTU/h
      Capacity at 17°F34,200 BTU/h
      Capacity at 5°F27,800 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder51% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CBK47UHET-060-230- 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.
      CBK47UHET-060-230-15.812.27.827,800218457521
      CBK48MVT-060-230-15.512.07.827,800218630629
      Yearly running cost in 10 large cities$1,737-$4,459

      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 ML16KP2-060-230A?
      The Lennox ML16KP2-060-230A is rated at up to 15.8 SEER2 and 12.2 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.5-15.8.
      Is the Lennox ML16KP2-060-230A 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 5-ton model.
      How much does the Lennox ML16KP2-060-230A cost to run per year?
      At its rated efficiency it costs about $1,737-$4,459 a year in electricity in large U.S. cities, depending on climate and local rates - for example $2,116 in Phoenix and $3,706 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 Lennox ML16KP2-060-230A?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use CBK47UHET-060-230-, CBK48MVT-060-230-.
      What refrigerant does the Lennox ML16KP2-060-230A use?
      It uses R-454B.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $2,086/yrYou save $865/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 ML16KP2-060-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $2,086
      Current system, per year
      $2,951
      You save per year
      $865
      Payback
      25.4 years
      Net after 10 years
      -$13,349

      Cooling $1,303Heating $783Electricity used: 13,037 kWhSaved vs. a minimum-efficiency heat pump: $168

      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 July 17, 2026. How we use the data.