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      5-ton central heat pump · Elite EL21KLV SERIES

      Lennox EL21KLV-060-230A

      Excellent cooling efficiency and average heating efficiency for a 5-ton central heat pump, and certified for cold climates.

      Ranks #2 of 100 5 ton central heat pumps for cooling efficiency, and costs about $1,506 a year to run in a mixed climate like Atlanta.

      SEER2
      20.5 Cooling efficiency over a season
      Excellent · beats 96%
      HSPF2
      9.0 Heating efficiency over a season
      Average · beats 54%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      38,500 BTU/h65% of its 47°F output
      Very good · beats 71%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 96% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 38,500 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 106 certified pairings.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications5 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelEL21KLV-060-230A
      SeriesElite EL21KLV SERIES
      TypeCentral heat pump
      Nominal size5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceMarch 7, 2025
      Last certifiedMarch 17, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better20.5 (range 16.0-20.5)
      EER2Efficiency at 95°F outdoors11.0-12.2
      Cooling capacity52,500-56,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.2-9.0
      Capacity at 47°F52,000-55,500 BTU/h
      Capacity at 17°F40,000-46,000 BTU/h
      Capacity at 5°F31,000-38,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.06-2.18
      ENERGY STAR cold climateYes
      Heating output as it gets colder65% 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-60D-**+TDR at the standard test temperatures, in BTU/h:

      Certified matchups106 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 106 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-60D-**+TDRSL280UH135V60D*20.511.79.034,200217117034
      CK40[C,U]T-49C-**+TDRSL280UH080NV60C*20.511.78.535,600217117003
      CK40[C,U]T-49C-**+TDRSL280UH100NV60C*20.511.78.535,600217117006
      CK40[C,U]T-60C-**+TDRSL280UH080NV60C*20.512.08.534,800217117023
      CK40[C,U]T-60C-**+TDRSL280UH090V60C*20.512.08.534,600217117024
      CK40[C,U]T-60C-**+TDRSL280UH090XV60C*20.512.08.534,600217117025
      CK40[C,U]T-60C-**+TDRSL280UH100NV60C*20.512.08.534,800217117026
      CK40[C,U]T-60C-**+TDRSL280UH110V60C*20.512.08.534,800217117027
      CK40[C,U]T-60C-**+TDRSL280UH110XV60C*20.512.08.534,800217117028
      CK40[C,U]T-60D-**+TDRSL297UH080NV60C*20.511.78.534,600217117035
      CK40[C,U]T-60D-**+TDREL297UH135XV60D*20.511.78.534,400217117037
      CK40[C,U]T-60C-**+TDRML180UH110V60C*20.512.28.533,800217121514
      CK40[C,U]T-60D-**+TDRSLP99UH135XV60D*20.511.78.534,400217117122
      CBK48MVT-060-230--20.011.59.038,500217116999
      CK40HT-60D-**+TDRSL280UH135V60D*20.012.08.535,200217117007
      CK40HT-60D-**+TDRSL280UH080NV60C*20.012.08.535,200217117015
      CK40[C,U]T-60C-**+TDRSL297UH080NV60C*20.011.78.535,200217117029
      CK40[C,U]T-60C-**+TDRSLP99UH090XV60C*20.011.78.535,000217117030
      CK40[C,U]T-60C-**+TDRSLP99UH110XV60C*20.011.78.535,000217117031
      CK40[C,U]T-60C-**+TDREL297UH090XV60C*20.011.78.535,200217117032
      CK40[C,U]T-60C-**+TDREL297UH110XV60C*20.011.78.535,000217117033
      CK40[C,U]T-60D-**+TDREL297UH110XV60C*20.011.78.534,600217117036
      CK40[C,U]T-60C-**+TDRML180UH110E60C*20.011.78.534,800217121513
      CK40[C,U]T-60C-**+TDRML180UH110XE60C*20.011.78.534,800217121515
      CK40[C,U]T-49C-**+TDRSL280UH090V60C*20.011.58.535,400217117004
      CK40[C,U]T-49C-**+TDRSL280UH090XV60C*20.011.58.535,400217117005
      CK40[C,U]T-49C-**+TDRSL280UH110V60C*20.011.58.535,600217117008
      CK40[C,U]T-49C-**+TDRSL280UH110XV60C*20.011.58.535,600217117010
      CK40[C,U]T-49C-**+TDRSL297UH080NV60C*20.011.58.535,800217117011
      CK40[C,U]T-49C-**+TDRSLP99UH110XV60C*20.011.58.535,800217117013
      CK40[C,U]T-49C-**+TDREL297UH090XV60C*20.011.28.536,000217117014
      CK40[C,U]T-49C-**+TDREL297UH110XV60C*20.011.58.535,800217117017
      CK40[C,U]T-60C-**+TDRML180UH070V48B*20.012.08.234,200217121521
      CK40HT-60D-**+TDRSLP99UH135XV60D*19.511.78.535,200217117009
      CK40HT-60D-**+TDRSL297UH080NV60C*19.511.78.535,600217117016
      CK40HT-60D-**+TDRSLP99UH090XV60C*19.511.78.535,400217117018
      CK40HT-60D-**+TDREL297UH110XV60C*19.511.78.535,400217117019
      CK40HT-60D-**+TDREL297UH135XV60D*19.511.78.535,200217117020
      CK40HT-60D-**+TDRML180UH110E60C*19.511.78.535,600217121498
      CK40HT-60D-**+TDRML180UH110XE60C*19.511.78.535,600217121504
      CK40[C,U]T-60C-**+TDREL196UH110XE60C*19.511.78.534,600217121509
      CK40[C,U]T-60C-**+TDREL280UH110E60C*19.511.78.534,800217121510
      CK40[C,U]T-60C-**+TDREL280UH110XE60C*19.511.78.534,800217121511
      CK40[C,U]T-60C-**+TDRML180UH090E60C*19.511.78.534,800217121512
      CK40[C,U]T-60C-**+TDRML193UH110XE60C*19.511.78.534,600217121516
      CK40[C,U]T-60C-**+TDRML196UH090XE60C*19.511.78.534,600217121517
      CK40[C,U]T-60C-**+TDREL297UH110XE60C*19.511.78.534,600217121522
      CK40[C,U]T-49C-**+TDRSLP99UH090XV60C*19.511.58.535,800217117012
      CK40[C,U]T-49C-**+TDREL180UH100NE60C*19.511.08.535,800217121488
      CK40[C,U]T-49C-**+TDREL280UH110E60C*19.511.28.535,600217121490
      CK40[C,U]T-49C-**+TDREL280UH110XE60C*19.511.28.535,600217121491
      CK40[C,U]T-49C-**+TDRML180UH110E60C*19.511.28.535,600217121493
      CK40[C,U]T-49C-**+TDRML180UH110XE60C*19.511.28.535,600217121494
      CK40[C,U]T-49C-**+TDRML193UH110XE60C*19.511.28.535,400217121495
      CK40[C,U]T-60C-**+TDREL180UH100NE60C*19.511.58.535,000217121507
      CK40HT-51/61C-**+TDRSLP99UH090XV60C*19.511.08.532,000217454968
      CK40HT-51/61C-**+TDRSLP98UH090XV60C*19.511.08.532,000217490335
      CK40HT-51/61C-**+TDRSL280UH080NV60C*19.511.28.531,800217493284
      CK40HT-51/61C-**+TDRSL280UH090V60C*19.511.28.531,600217493285
      CK40HT-51/61C-**+TDRSL280UH090XV60C*19.511.28.531,600217493286
      Yearly running cost in 10 large cities$1,254-$3,675

      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 EL21KLV-060-230A?
      The Lennox EL21KLV-060-230A is rated at up to 20.5 SEER2 and 11.7 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 106 certified matchups SEER2 ranges from 16.0-20.5.
      Is the Lennox EL21KLV-060-230A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 38,500 BTU/h at 5°F with a COP of 2.18, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Lennox EL21KLV-060-230A cost to run per year?
      At its rated efficiency it costs about $1,254-$3,675 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,591 in Phoenix and $3,105 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 EL21KLV-060-230A?
      ENERGY STAR lists 106 certified combinations for this outdoor unit. The highest-rated ones use CK40[C,U]T-60D-**+TDR, CK40[C,U]T-49C-**+TDR, CK40[C,U]T-60C-**+TDR.
      What refrigerant does the Lennox EL21KLV-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 $1,602/yrYou save $1,192/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 EL21KLV-060-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,602
      Current system, per year
      $2,794
      You save per year
      $1,192
      Payback
      17.2 years
      Net after 10 years
      -$8,578

      Cooling $936Heating $666Electricity used: 10,010 kWhSaved vs. a minimum-efficiency heat pump: $539

      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 March 17, 2026. How we use the data.