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      3.5-ton central heat pump · DAVE LENNOX SIGNATURE SL22KLV SERIES

      Lennox SL22KLV-048-230A

      Excellent cooling efficiency and very good heating efficiency for a 3.5-ton central heat pump, and certified for cold climates.

      Ranks #9 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,191 a year to run in a mixed climate like Atlanta.

      SEER2
      20.5 Cooling efficiency over a season
      Excellent · beats 96%
      HSPF2
      9.8 Heating efficiency over a season
      Very good · beats 79%
      EER2
      12.4 Cooling efficiency on a 95°F day
      Very good · beats 76%
      Heat at 5°F
      46,500 BTU/h98% of its 47°F output
      Average · beats 58%

      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 46,500 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 79% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

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

      Calculate my running cost

      Details

      Specifications3.5 ton, R-454B
      General
      BrandLennox
      Outdoor unit modelSL22KLV-048-230A
      SeriesDAVE LENNOX SIGNATURE SL22KLV SERIES
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 14, 2024
      Last certifiedOctober 27, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better20.5 (range 18.0-20.5)
      EER2Efficiency at 95°F outdoors11.2-12.4
      Cooling capacity43,500-46,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-9.8
      Capacity at 47°F43,000-46,500 BTU/h
      Capacity at 17°F37,400-46,000 BTU/h
      Capacity at 5°F37,000-46,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.68-2.10
      ENERGY STAR cold climateYes
      Heating output as it gets colder98% 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-60C-**+TDR at the standard test temperatures, in BTU/h:

      Certified matchups38 indoor units

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

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH080NV60C*20.512.49.444,000216776088
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH100NV60C*20.512.49.444,000216776091
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH080NV60C*20.512.08.545,500216776099
      CBK48MVT-060-230- · cold climate-20.011.79.844,500216776012
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH090V60C*20.012.29.444,000216776089
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH090XV60C*20.012.29.444,000216776090
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH110V60C*20.012.09.044,500216776092
      CK40[C,U]T-60C-**+TDR · cold climateSL280UH110XV60C*20.012.09.044,500216776093
      CK40[C,U]T-60C-**+TDR · cold climateSLP99UH090XV60C*20.011.79.044,500216776095
      CK40[C,U]T-60C-**+TDR · cold climateSLP99UH110XV60C*20.011.79.044,500216776096
      CK40[C,U]T-60C-**+TDR · cold climateEL297UH090XV60C*20.011.79.044,500216776097
      CK40[C,U]T-60C-**+TDR · cold climateEL297UH110XV60C*20.011.79.044,500216776098
      CBK48MVT-048-230- · cold climate-20.012.08.543,500216776087
      CK40[C,U]T-60C-**+TDR · cold climateSL297UH080NV60C*20.011.78.537,400216776094
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH100NV60C*20.012.08.545,500216776102
      CK40[C,U]T-49C-**+TDREL297UH090XV48C*20.011.58.138,000217550310
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH090V60C*19.511.78.546,000216776100
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH090XV60C*19.511.78.546,000216776101
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH110V60C*19.511.78.546,000216776103
      CK40[C,U]T-49C-**+TDR · cold climateSL280UH110XV60C*19.511.78.546,000216776104
      CK40[C,U]T-49C-**+TDR · cold climateSLP99UH090XV60C*19.511.58.546,500216776116
      CK40[C,U]T-49C-**+TDR · cold climateSLP99UH110XV60C*19.511.58.546,000216776117
      CK40[C,U]T-49C-**+TDR · cold climateEL297UH090XV60C*19.511.58.546,500216776118
      CK40[C,U]T-49C-**+TDR · cold climateEL297UH110XV60C*19.511.58.546,000216776119
      CK40[C,U]T-49C-**+TDRSL297UH080NV60C*19.511.58.238,500216776115
      CK40[C,U]T-60D-**+TDRSL280UH135V60D*19.511.58.037,400217476466
      CK40[C,U]T-60D-**+TDREL297UH135XV60D*19.511.58.037,600217476470
      CK40[C,U]T-60D-**+TDRSLP99UH135XV60D*19.511.57.837,600217476468
      CK40HT-60D-**+TDR · cold climateSL280UH135V60D*19.012.28.537,000217476521
      CK40HT-60D-**+TDR · cold climateSLP99UH135XV60D*19.012.28.537,200217476522
      CK40HT-60D-**+TDR · cold climateSL280UH080NV60C*19.012.08.537,400217476523
      CK40HT-60D-**+TDR · cold climateEL297UH110XV60C*19.012.08.537,400217476525
      CK40HT-60D-**+TDR · cold climateEL297UH135XV60D*19.012.28.537,200217476526
      CK40HT-60D-**+TDR · cold climateSL280UH090V60C*19.012.28.537,200217476527
      CK40[C,U]T-60D-**+TDREL297UH110XV60C*19.011.57.837,600217476469
      CK40HT-60D-**+TDR · cold climateSLP99UH090XV60C*18.512.08.537,400217476524
      CK40[C,U]T-60D-**+TDRSL297UH080NV60C*18.511.27.838,000217476467
      CK40HT-60D-**+TDR · cold climateSL297UH080NV60C*18.011.78.537,600217476465
      Yearly running cost in 10 large cities$1,033-$2,873

      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 SL22KLV-048-230A?
      The Lennox SL22KLV-048-230A is rated at up to 20.5 SEER2 and 12.4 EER2 for cooling and up to 9.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 38 certified matchups SEER2 ranges from 18.0-20.5.
      Is the Lennox SL22KLV-048-230A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 46,500 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the Lennox SL22KLV-048-230A cost to run per year?
      At its rated efficiency it costs about $1,033-$2,873 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,289 in Phoenix and $2,412 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 SL22KLV-048-230A?
      ENERGY STAR lists 38 certified combinations for this outdoor unit. The highest-rated ones use CK40[C,U]T-60C-**+TDR, CK40[C,U]T-49C-**+TDR, CBK48MVT-060-230-.
      What refrigerant does the Lennox SL22KLV-048-230A 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 $1,287/yrYou save $1,033/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 SL22KLV-048-230A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,287
      Current system, per year
      $2,320
      You save per year
      $1,033
      Payback
      16.5 years
      Net after 10 years
      -$6,667

      Cooling $773Heating $514Electricity used: 8,044 kWhSaved vs. a minimum-efficiency heat pump: $493

      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 October 27, 2025. How we use the data.