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      3-ton central heat pump · Merit ML16KP2 SERIES

      Lennox ML16KP2-036-230A

      Average cooling efficiency and below average heating efficiency for a 3-ton central heat pump, but not rated for cold climates.

      Ranks #129 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,089 a year to run in a mixed climate like Atlanta.

      SEER2
      17.5 Cooling efficiency over a season
      Average · beats 58%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Very good · beats 89%
      Heat at 5°F
      19,100 BTU/h51% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want a choice of indoor units - 87 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications3 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelML16KP2-036-230A
      SeriesMerit ML16KP2 SERIES
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceMay 13, 2026
      Last certifiedSeptember 30, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.5 (range 15.2-17.5)
      EER2Efficiency at 95°F outdoors11.7-13.0
      Cooling capacity34,600-36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F34,000-36,000 BTU/h
      Capacity at 17°F20,600-23,800 BTU/h
      Capacity at 5°F15,700-19,100 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.84-2.10
      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 CBK45UHVT-036-230- at the standard test temperatures, in BTU/h:

      Certified matchups87 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 87 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CBK45UHVT-036-230--17.513.07.817,600218457596
      CK40DT-50/60C-**+TDREL297DF110XV60C*17.012.58.218,800218457672
      CK40DT-50/60C-**+TDREL297DF090XV60C*17.012.58.218,800218457671
      CK40DT-50/60C-**+TDRSLP99DF110XV60C*17.012.58.218,800218457670
      CK40DT-50/60C-**+TDRSL280DF110V60C*17.013.08.218,500218457666
      CK40DT-50/60C-**+TDRSL280DF090V60C*17.013.08.218,600218457665
      CBK45UHET-042-230--17.012.58.118,100218457645
      CBK45UHVT-042-230--17.012.58.017,700218457642
      CBK47UHET-042-230--17.013.08.015,700218457595
      CBK48MVT-036-230--17.013.08.017,100218457593
      CBK48MVT-042-230--17.013.08.015,700218457591
      CBK45UHET-036-230--17.013.07.817,800218457597
      CK40DT-50/60C-**+TDRML180DF110E60C*16.513.08.518,400218457660
      CBK43UHET-036-DV--16.512.58.217,900218457673
      CK40DT-50/60C-**+TDRSLP99DF090XV60C*16.512.58.218,800218457669
      CK40DT-50/60C-**+TDRSLP99DF090XV48C*16.512.58.218,500218457668
      CK40DT-50/60C-**+TDRSLP99DF090XV36C*16.513.08.218,300218457667
      CK40DT-50/60C-**+TDRML296DF090XV60C*16.512.58.218,900218457664
      CK40DT-50/60C-**+TDRML196DF090XE48C*16.513.08.218,300218457662
      CK40DT-50/60C-**+TDRML193DF090XE48C*16.513.08.218,400218457661
      CK40DT-50/60C-**+TDREL297DF090XE48C*16.513.08.218,300218457659
      CK40DT-50/60C-**+TDRSL280DF080NV60C*16.513.08.218,700218457658
      CK40HT-36C-**+TDREL297UH110XV60C*16.512.58.218,100218457641
      CK40HT-36C-**+TDRSLP99UH110XV60C*16.512.58.218,300218457623
      CK40HT-36C-**+TDRSL280UH090XV60C*16.512.58.218,000218457618
      CK40HT-36C-**+TDRSL280UH090V60C*16.512.58.218,000218457617
      CK40HT-36C-**+TDRML180UH110V60C*16.512.58.218,000218457606
      CK40HT-36C-**+TDREL280UH110E48C*16.512.58.218,100218457603
      CK40DT-50/60C-**+TDRML297DF090XV60C*16.513.08.218,400218732581
      CBK47UHET-030-230--16.513.07.816,800218457594
      CBK48MVT-030-230--16.513.07.816,800218457592
      CBK47UHET-036-230--16.412.68.017,000218457519
      CK40DT-50/60C-**+TDRML196DF110XE60C*16.013.08.218,700218457663
      CK40HT-36C-**+TDREL297UH110XV48C*16.012.58.217,800218457640
      CK40HT-36C-**+TDREL297UH090XV60C*16.012.58.218,100218457638
      CK40HT-36C-**+TDREL297UH090XV48C*16.012.58.217,900218457637
      CK40HT-36C-**+TDREL297UH090XV36C*16.012.58.217,800218457636
      CK40HT-36C-**+TDREL297UH090XE48C*16.012.58.217,900218457635
      CK40HT-36C-**+TDRSLP99UH090XV60C*16.012.58.218,200218457634
      CK40HT-36C-**+TDRSL297UH080NV60C*16.012.08.218,400218457633
      CK40HT-36C-**+TDRML196UH090XE36C*16.012.58.218,000218457632
      CK40HT-36C-**+TDRML196UH070XE36B*16.012.08.218,100218457631
      CK40HT-36C-**+TDRML193UH110XE60C*16.012.58.218,200218457629
      CK40HT-36C-**+TDRML180UH070E36B*16.012.58.218,100218457626
      CK40HT-36C-**+TDRSLP99UH090XV48C*16.012.58.217,900218457622
      CK40HT-36C-**+TDRSLP99UH090XV36C*16.012.58.218,000218457621
      CK40HT-36C-**+TDRSL280UH100NV60C*16.012.58.218,200218457619
      CK40HT-36C-**+TDRSL280UH080NV60C*16.012.58.218,000218457616
      CK40HT-36C-**+TDRML296UH110XV60C*16.012.58.218,000218457615
      CK40HT-36C-**+TDRML296UH090XV48C*16.012.58.218,000218457614
      CK40HT-36C-**+TDRML196UH090XE60C*16.012.58.218,200218457612
      CK40HT-36C-**+TDRML196UH090XE48C*16.012.58.217,800218457611
      CK40HT-36C-**+TDRML193UH110XE48C*16.012.58.217,700218457610
      CK40HT-36C-**+TDRML193UH090XE48C*16.012.58.217,800218457609
      CK40HT-36C-**+TDRML193UH090XE36C*16.012.58.217,900218457608
      CK40HT-36C-**+TDRML180UH110XE60C*16.012.58.218,000218457607
      CK40HT-36C-**+TDRML180UH110E60C*16.012.58.218,000218457605
      CK40HT-36C-**+TDREL196UH110XE60C*16.012.58.218,300218457602
      CK40HT-36C-**+TDREL196UH090XE48C*16.012.58.217,800218457601
      CK40HT-36C-**+TDREL195UH080NE48C*16.012.08.218,400218457599
      Yearly running cost in 10 large cities$967-$2,610

      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 ML16KP2-036-230A?
      The Lennox ML16KP2-036-230A is rated at up to 17.5 SEER2 and 13.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 87 certified matchups SEER2 ranges from 15.2-17.5.
      Is the Lennox ML16KP2-036-230A 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 3-ton model.
      How much does the Lennox ML16KP2-036-230A cost to run per year?
      At its rated efficiency it costs about $967-$2,610 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,195 in Phoenix and $2,183 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 ML16KP2-036-230A?
      ENERGY STAR lists 87 certified combinations for this outdoor unit. The highest-rated ones use CBK45UHVT-036-230-, CK40DT-50/60C-**+TDR, CBK45UHET-042-230-.
      What refrigerant does the Lennox ML16KP2-036-230A 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 $1,188/yrYou save $655/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 ML16KP2-036-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,188
      Current system, per year
      $1,843
      You save per year
      $655
      Payback
      20.6 years
      Net after 10 years
      -$6,948

      Cooling $724Heating $464Electricity used: 7,425 kWhSaved vs. a minimum-efficiency heat pump: $224

      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 September 30, 2026. How we use the data.