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      1.5-ton central heat pump · MERIT ML14KP1 Series

      Lennox ML14KP1-018-230A

      Average cooling efficiency and below average heating efficiency for a 1.5-ton central heat pump, but not rated for cold climates.

      Ranks #96 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $592 a year to run in a mixed climate like Atlanta.

      SEER2
      16.5 Cooling efficiency over a season
      Average · beats 40%
      HSPF2
      7.8 Heating efficiency over a season
      Below average · beats 5%
      EER2
      14.0 Cooling efficiency on a 95°F day
      Excellent · beats 98%
      Heat at 5°F
      8,500 BTU/h46% of its 47°F output
      Average · beats 53%

      A good fit if…

      • You want a choice of indoor units - 67 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

      Specifications1.5 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelML14KP1-018-230A
      SeriesMERIT ML14KP1 Series
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerSingle stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceOctober 1, 2024
      Last certifiedSeptember 30, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.5 (range 15.2-16.5)
      EER2Efficiency at 95°F outdoors13.0-14.2
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8
      Capacity at 47°F17,500-18,000 BTU/h
      Capacity at 17°F10,500-11,200 BTU/h
      Capacity at 5°F7,900-8,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.86-2.08
      ENERGY STAR cold climateNo
      Heating output as it gets colder46% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CK40HT-24B-**+TDR at the standard test temperatures, in BTU/h:

      Certified matchups67 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 67 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CK40HT-24B-**+TDRML180UH090V48B*16.514.07.88,200215685604
      CK40HT-30A-**+TDREL280UH070E36A*16.514.27.88,200215685623
      CK40HT-30A-**+TDREL280UH070XE36A*16.514.27.88,200215685624
      CK40HT-30A-**+TDRML180UH030V36A*16.514.07.88,100215685625
      CK40HT-30A-**+TDRML180UH045E36A*16.514.07.88,100215685626
      CK40HT-30A-**+TDRML180UH045XE36A*16.514.07.88,100215685627
      CK40HT-30A-**+TDRML180UH070E36A*16.514.07.88,100215685629
      CK40HT-30A-**+TDRML180UH070V36A*16.514.07.88,100215685630
      CK40HT-30A-**+TDRML180UH070XE36A*16.514.07.88,100215685631
      CK40HT-30A-**+TDRSL280UH060NV36A*16.514.07.88,100215685632
      CK40HT-30B-**+TDRSL280UH090V48B*16.514.27.88,200215685662
      CBK45UHVT-018-230--16.013.67.88,100215685481
      CBK45UHET-024-230--16.013.87.88,200215685483
      CBK45UHVT-024-230--16.013.87.88,400215685484
      CBK48MVT-018/024-230--16.013.87.88,300215685485
      CK40HT-24A-**+TDREL280UH070E36A*16.013.87.88,000215685578
      CK40HT-24A-**+TDREL280UH070XE36A*16.013.87.88,000215685579
      CK40HT-24A-**+TDRML180UH030V36A*16.013.87.87,900215685580
      CK40HT-24A-**+TDRML180UH045E36A*16.013.87.87,900215685581
      CK40HT-24A-**+TDRML180UH045V36A*16.014.07.87,900215685582
      CK40HT-24A-**+TDRML180UH045XE36A*16.013.87.87,900215685583
      CK40HT-24A-**+TDRML180UH070E36A*16.013.87.88,000215685584
      CK40HT-24A-**+TDRML180UH070V36A*16.013.87.88,000215685585
      CK40HT-24A-**+TDRML180UH070XE36A*16.013.87.88,000215685586
      CK40HT-24A-**+TDRSL280UH060NV36A*16.013.87.88,000215685587
      CK40HT-24A-**+TDRSL280UH070V36A*16.013.67.88,000215685588
      CK40HT-24A-**+TDRSL280UH070XV36A*16.013.67.88,000215685589
      CK40HT-24B-**+TDREL195UH060NE36B*16.013.87.88,300215685591
      CK40HT-24B-**+TDREL280UH090E36B*16.013.87.88,300215685595
      CK40HT-24B-**+TDREL297UH045XE36B*16.013.87.88,300215685596
      CK40HT-24B-**+TDREL297UH070XE36B*16.013.67.88,200215685598
      CK40HT-24B-**+TDREL297UH070XV36B*16.013.87.88,300215685599
      CK40HT-24B-**+TDRML180UH070E36B*16.013.87.88,200215685600
      CK40HT-24B-**+TDRML180UH070V36B*16.014.07.88,200215685601
      CK40HT-24B-**+TDRML180UH070V48B*16.013.87.88,200215685602
      CK40HT-24B-**+TDRML180UH070XE36B*16.013.87.88,200215685603
      CK40HT-24B-**+TDRML193UH045XE36B*16.013.87.88,300215685606
      CK40HT-24B-**+TDRML193UH070XE36B*16.013.87.88,300215685607
      CK40HT-24B-**+TDRML296UH045XV36B*16.013.67.88,200215685611
      CK40HT-24B-**+TDRML296UH070XV36B*16.013.67.88,200215685612
      CK40HT-24B-**+TDRSL280UH090V36B*16.013.87.88,200215685614
      CK40HT-24B-**+TDRSL280UH090V48B*16.013.87.88,300215685615
      CK40HT-24B-**+TDRSL297UH060NV36B*16.013.67.88,300215685617
      CK40HT-24B-**+TDRSLP99UH070XV36B*16.013.87.88,200215685618
      CK40HT-30A-**+TDREL280UH045E36A*16.013.87.88,300215685622
      CK40HT-30A-**+TDRML180UH045V36A*16.014.27.88,100215685628
      CK40HT-30A-**+TDRSL280UH070V36A*16.013.87.88,200215685633
      CK40HT-30A-**+TDRSL280UH070XV36A*16.013.87.88,200215685634
      CK40DT-30/36B-**+TDRSLP99DF070XV36B*15.513.27.88,400215685681
      CBK47UHET-018-230--15.513.67.88,300215685486
      CK40HT-24A-**+TDREL180UH040NE36A*15.513.67.88,000215685575
      CK40HT-24A-**+TDREL180UH060NE36A*15.513.67.88,000215685576
      CK40HT-24A-**+TDREL280UH045E36A*15.513.47.88,100215685577
      CK40HT-24B-**+TDRML193UH030XE36B*15.513.67.88,400215685605
      CK40DT-30/36B-**+TDREL297DF045XV36B*15.513.47.88,400215685670
      CK40DT-30/36B-**+TDREL297DF070XV48B*15.513.27.88,400215685672
      CK40DT-30/36B-**+TDRML193DF045XE36B*15.513.27.88,400215685674
      CK40DT-30/36B-**+TDRML193DF070XE36B*15.513.27.88,400215685675
      CK40DT-30/36B-**+TDRML196DF045XE36B*15.513.27.88,400215685676
      CK40DT-30/36B-**+TDRSL280DF060NV36B*15.513.27.88,300215685679
      Yearly running cost in 10 large cities$514-$1,428

      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 ML14KP1-018-230A?
      The Lennox ML14KP1-018-230A is rated at up to 16.5 SEER2 and 14.0 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 67 certified matchups SEER2 ranges from 15.2-16.5.
      Is the Lennox ML14KP1-018-230A 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 1.5-ton model.
      How much does the Lennox ML14KP1-018-230A cost to run per year?
      At its rated efficiency it costs about $514-$1,428 a year in electricity in large U.S. cities, depending on climate and local rates - for example $641 in Phoenix and $1,199 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 ML14KP1-018-230A?
      ENERGY STAR lists 67 certified combinations for this outdoor unit. The highest-rated ones use CK40HT-24B-**+TDR, CK40HT-30A-**+TDR, CK40HT-30B-**+TDR.
      What refrigerant does the Lennox ML14KP1-018-230A 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 $640/yrYou save $285/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 ML14KP1-018-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $640
      Current system, per year
      $925
      You save per year
      $285
      Payback
      24.5 years
      Net after 10 years
      -$4,147

      Cooling $384Heating $256Electricity used: 3,997 kWhSaved vs. a minimum-efficiency heat pump: $69

      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.

      Similar 1.5 ton models

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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 30, 2026. How we use the data.