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      2-ton central heat pump · Elite

      Mainline MLP19AY24AJVC

      Excellent cooling efficiency and very good heating efficiency for a 2-ton central heat pump, and certified for cold climates.

      Ranks #15 of 331 2 ton central heat pumps for cooling efficiency, and costs about $611 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Excellent · beats 97%
      HSPF2
      9.5 Heating efficiency over a season
      Very good · beats 70%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Very good · beats 89%
      Heat at 5°F
      19,500 BTU/h81% of its 47°F output
      Below average · beats 20%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 97% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,500 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 70% 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

      Specifications2 ton, R-454B
      General
      BrandMainline
      Outdoor unit modelMLP19AY24AJVC
      SeriesElite
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableYes
      On the market sinceSeptember 12, 2024
      Last certifiedSeptember 15, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 20.0-21.0)
      EER2Efficiency at 95°F outdoors12.0-13.0
      Cooling capacity22,800 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5-9.5
      Capacity at 47°F22,800-24,000 BTU/h
      Capacity at 17°F21,200 BTU/h
      Capacity at 5°F18,400-19,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.90
      ENERGY STAR cold climateYes
      Heating output as it gets colder81% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TCFY2421HEAAM at the standard test temperatures, in BTU/h:

      Certified matchups27 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.
      TCFY2421HEAAM · cold climateML98MV0603A17UP21.013.08.518,500216684924
      TCFY2421HEAAM · cold climateML97MV0855A21DH21.013.08.518,400216684925
      TCFY2421HEAAM · cold climateML802V0754A17UH21.013.08.518,400216684934
      TCFY2421HEAAM · cold climateML801V0704A17UH21.013.08.518,500216684936
      TCFY2421HEAAM · cold climateML801V0754A17UH21.013.08.518,400216684933
      TCFY2421HEAAM · cold climateML921V0603A17M421.013.08.518,600216684913
      TCFY2421HEAAM · cold climateML951V0603A17M421.013.08.518,600216684914
      TCFY2421HEAAM · cold climateML951V0603A17UH21.013.08.518,600216684915
      TCFY2421HEAAM · cold climateML951V0403A17M421.013.08.518,500216684917
      TCFY2421HEAAM · cold climateML921V0403A17M421.013.08.518,500216684916
      TCFY2421HEAAM · cold climateML951V0403A17UH21.013.08.518,700216684918
      TCFY2421HEAAM · cold climateML97MV0603A17DH21.013.08.518,500216684923
      TCFY2421HEAAM · cold climateML962V0603A17M421.013.08.518,600216684922
      TCFY2421HEAAM · cold climateML98MV1005A21UP21.013.08.518,500216684921
      TCFY2421HEAAM · cold climateML97MV0703A17DH21.013.08.518,500216684926
      TCFY2421HEAAM · cold climateML962V0403A17M421.013.08.518,500216684929
      TCFY2421HEAAM · cold climateML98MV0855A21UP21.013.08.518,400216684927
      MLHMVY3621MEACA · cold climate-20.013.09.519,500215747656
      TCFY2421HEAAM · cold climateML801V0504A17UHS20.012.08.518,500216684931
      TCFY2421HEAAM · cold climateML98MV0703A17UP20.012.08.518,500216684928
      TCFY2421HEAAM · cold climateML802V0504A17UH20.012.08.518,500216684937
      TCFY2421HEAAM · cold climateML801V0504A17UHU20.012.08.518,600216684932
      TCFY2421HEAAM · cold climateML801V0504A17UHN20.012.08.518,500216684935
      TCFY2421HEAAM · cold climateML951V0703A17M420.012.08.518,600216684912
      TCFY2421HEAAM · cold climateML962V0703A17M420.012.08.518,600216684920
      TCFY2421HEAAM · cold climateML921V0703A17M420.012.08.518,600216684919
      TCFY2421HEAAM · cold climateML97MV1005A21DH20.012.08.518,400216684930
      Yearly running cost in 10 large cities$512-$1,487

      At each state's average electricity price and the city's typical heating and cooling hours.

      Questions5
      What is the SEER2 rating of the Mainline MLP19AY24AJVC?
      The Mainline MLP19AY24AJVC is rated at up to 21.0 SEER2 and 13.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 27 certified matchups SEER2 ranges from 20.0-21.0.
      Is the Mainline MLP19AY24AJVC good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,500 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the Mainline MLP19AY24AJVC cost to run per year?
      At its rated efficiency it costs about $512-$1,487 a year in electricity in large U.S. cities, depending on climate and local rates - for example $648 in Phoenix and $1,255 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 Mainline MLP19AY24AJVC?
      ENERGY STAR lists 27 certified combinations for this outdoor unit. The highest-rated ones use TCFY2421HEAAM, MLHMVY3621MEACA.
      What refrigerant does the Mainline MLP19AY24AJVC 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 $651/yrYou save $525/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 Mainline MLP19AY24AJVC
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $651
      Current system, per year
      $1,176
      You save per year
      $525
      Payback
      16.2 years
      Net after 10 years
      -$3,253

      Cooling $382Heating $269Electricity used: 4,069 kWhSaved vs. a minimum-efficiency heat pump: $251

      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 2 ton models

      See all 331 2 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 15, 2026. How we use the data.