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      3-ton central heat pump · MERIT ML14KP1 Series

      Lennox ML14KP1-036-230A

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

      Ranks #202 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,136 a year to run in a mixed climate like Atlanta.

      SEER2
      16.5 Cooling efficiency over a season
      Average · beats 40%
      HSPF2
      8.1 Heating efficiency over a season
      Below average · beats 20%
      EER2
      13.8 Cooling efficiency on a 95°F day
      Excellent · beats 97%
      Heat at 5°F
      17,600 BTU/h51% of its 47°F output
      Average · beats 51%

      A good fit if…

      • You want a choice of indoor units - 109 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.
      • Comfort and noise matter - a single-stage compressor runs only full-on or off.

      Calculate my running cost

      Details

      Specifications3 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelML14KP1-036-230A
      SeriesMERIT ML14KP1 Series
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerSingle stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceOctober 1, 2024
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.5 (range 15.2-16.5)
      EER2Efficiency at 95°F outdoors12.5-13.8
      Cooling capacity35,400-36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F31,400-35,600 BTU/h
      Capacity at 17°F20,000-21,200 BTU/h
      Capacity at 5°F15,700-17,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.90-2.06
      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 CK40[C,U]T-36C-**+TDR at the standard test temperatures, in BTU/h:

      Certified matchups109 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 109 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CK40[C,U]T-36C-**+TDRSL280UH090XV60C*16.513.88.117,300218073832
      CK40[C,U]T-36C-**+TDRSL280UH090V60C*16.513.88.117,300218073831
      CK40[C,U]T-36C-**+TDRML180UH110V60C*16.513.68.117,300218073828
      CK40[C,U]T-36C-**+TDREL297UH110XV48C*16.513.68.017,100218073839
      CK40[C,U]T-36C-**+TDRML180UH090E60C*16.513.68.017,100218073824
      CK40[C,U]T-36C-**+TDRML196UH090XE60C*16.513.68.017,100218073819
      CK40[C,U]T-36C-**+TDREL280UH110XE60C*16.513.88.017,200218073818
      CK40[C,U]T-36C-**+TDREL280UH110E60C*16.513.88.017,200218073817
      CK40[C,U]T-36C-**+TDRML193UH110XE60C*16.513.68.017,100218073816
      CK40[C,U]T-36C-**+TDRML193UH110XE48C*16.513.68.017,100218073815
      CK40[C,U]T-36C-**+TDREL280UH110E48C*16.513.88.017,000218073811
      CK40[C,U]T-36C-**+TDREL196UH110XE60C*16.513.68.017,200218073810
      CK40[C,U]T-36C-**+TDREL297UH090XV36C*16.513.67.817,100218073842
      CK40[C,U]T-36C-**+TDREL297UH090XE48C*16.513.67.817,000218073822
      CK40[C,U]T-36C-**+TDRML180UH110XE60C*16.513.67.817,000218073813
      CK40[C,U]T-36C-**+TDRML180UH110E60C*16.513.67.817,000218073812
      CK40[C,U]T-36C-**+TDRML196UH090XE48C*16.013.68.017,200218073846
      CK40[C,U]T-36C-**+TDRML296UH090XV48C*16.013.48.017,300218073845
      CK40[C,U]T-36C-**+TDRML296UH110XV60C*16.013.68.017,200218073843
      CK40[C,U]T-36C-**+TDREL297UH090XV60C*16.013.48.017,400218073840
      CK40[C,U]T-36C-**+TDREL297UH110XV60C*16.013.68.017,400218073838
      CK40[C,U]T-36C-**+TDRSLP99UH110XV60C*16.013.68.017,300218073837
      CK40[C,U]T-36C-**+TDRSLP99UH090XV48C*16.013.48.017,200218073836
      CK40[C,U]T-36C-**+TDRSLP99UH090XV36C*16.013.48.017,300218073835
      CK40[C,U]T-36C-**+TDRSLP99UH090XV60C*16.013.48.017,500218073834
      CK40[C,U]T-36C-**+TDRML196UH090XE36C*16.013.48.017,300218073833
      CK40[C,U]T-36C-**+TDREL196UH090XE48C*16.013.68.017,200218073830
      CK40[C,U]T-36C-**+TDRML196UH110XE60C*16.013.68.017,200218073829
      CK40[C,U]T-36C-**+TDRSL280UH100NV60C*16.013.48.017,400218073821
      CK40[C,U]T-36C-**+TDRSL280UH080NV60C*16.013.68.017,300218073820
      CK40[C,U]T-36C-**+TDRML193UH090XE36C*16.013.48.017,300218073814
      CK40[C,U]T-36C-**+TDREL180UH100NE60C*16.013.48.017,500218073809
      CK40[C,U]T-36C-**+TDREL297UH110XE60C*16.013.68.017,200218073808
      CK40[C,U]T-48C-**+TDREL280UH110E60C*16.013.47.816,500215735649
      CK40[C,U]T-48C-**+TDREL280UH110XE60C*16.013.47.816,500215735650
      CK40HT-42C-**+TDREL280UH110E48C*16.013.27.816,400215735718
      CK40HT-42C-**+TDREL280UH110E60C*16.013.47.816,500215735719
      CK40HT-42C-**+TDREL280UH110XE60C*16.013.47.816,500215735720
      CK40HT-42C-**+TDRML180UH090E60C*16.013.47.816,600215735728
      CBK47UHET-042-230--16.013.27.816,300215863846
      CBK48MVT-042-230--16.013.47.816,300215863847
      CK40[C,U]T-36C-**+TDREL297UH090XV48C*16.013.47.817,200218073841
      CK40[C,U]T-36C-**+TDRML193UH090XE48C*16.013.47.817,200218073823
      CK40[C,U]T-36C-**+TDRSL297UH080NV60C*15.513.28.017,600218073844
      CK40[C,U]T-48C-**+TDREL280UH110E48C*15.513.47.816,500215735648
      CK40[C,U]T-48C-**+TDREL296UH110XV48C*15.513.07.816,600215735656
      CK40[C,U]T-48C-**+TDREL296UH110XV60C*15.513.27.816,800215735657
      CK40[C,U]T-48C-**+TDREL297UH090XE48C*15.513.07.816,600215735658
      CK40[C,U]T-48C-**+TDRML180UH090E60C*15.513.27.816,600215735659
      CK40[C,U]T-48C-**+TDRML180UH110E60C*15.513.47.816,600215735660
      CK40[C,U]T-48C-**+TDRML193UH110XE48C*15.513.27.816,600215735664
      CK40[C,U]T-48C-**+TDRML180UH110V60C*15.513.47.816,500215735661
      CK40[C,U]T-48C-**+TDRSL280UH080NV60C*15.513.27.816,600215735672
      CK40[C,U]T-48C-**+TDRSL280UH090V60C*15.513.27.816,700215735673
      CK40[C,U]T-48C-**+TDRSL280UH090XV60C*15.513.27.816,700215735674
      CK40[C,U]T-48C-**+TDRSL280UH100NV60C*15.513.27.816,800215735675
      CK40[C,U]T-48C-**+TDRSLP99UH110XV60C*15.513.27.816,700215735680
      CK40HT-42B-**+TDREL280UH090E36B*15.513.07.816,800215735685
      CK40HT-42B-**+TDREL280UH090E48B*15.513.27.816,700215735686
      CK40HT-42B-**+TDREL280UH090XE48B*15.513.27.816,700215735687
      Yearly running cost in 10 large cities$1,025-$2,707

      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 ML14KP1-036-230A?
      The Lennox ML14KP1-036-230A is rated at up to 16.5 SEER2 and 13.8 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 109 certified matchups SEER2 ranges from 15.2-16.5.
      Is the Lennox ML14KP1-036-230A 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 ML14KP1-036-230A cost to run per year?
      At its rated efficiency it costs about $1,025-$2,707 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,259 in Phoenix and $2,258 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 ML14KP1-036-230A?
      ENERGY STAR lists 109 certified combinations for this outdoor unit. The highest-rated ones use CK40[C,U]T-36C-**+TDR, CK40[C,U]T-48C-**+TDR, CK40HT-42C-**+TDR.
      What refrigerant does the Lennox ML14KP1-036-230A 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 $1,246/yrYou save $587/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 ML14KP1-036-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,246
      Current system, per year
      $1,833
      You save per year
      $587
      Payback
      23.0 years
      Net after 10 years
      -$7,631

      Cooling $768Heating $478Electricity used: 7,790 kWhSaved vs. a minimum-efficiency heat pump: $156

      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 22, 2026. How we use the data.