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      4-ton central heat pump · Elite

      Mainline MLP19AY48AJVC

      Very good cooling and heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

      Ranks #44 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,223 a year to run in a mixed climate like Atlanta.

      SEER2
      19.0 Cooling efficiency over a season
      Very good · beats 85%
      HSPF2
      10.0 Heating efficiency over a season
      Very good · beats 84%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Average · beats 64%
      Heat at 5°F
      42,000 BTU/h92% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 85% of central heat pumps.
      • It will heat most of the year - its HSPF2 beats 84% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 14 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandMainline
      Outdoor unit modelMLP19AY48AJVC
      SeriesElite
      TypeCentral heat pump
      Nominal size4 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 better19.0 (range 18.0-19.0)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity45,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0
      Capacity at 47°F45,500 BTU/h
      Capacity at 17°F42,000 BTU/h
      Capacity at 5°F41,500-42,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder92% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MLHMVY4821SEACA at the standard test temperatures, in BTU/h:

      Certified matchups14 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.
      MLHMVY4821SEACA-19.012.010.042,000215611118
      TCFY4821SEAAMML962V0855A21M419.011.710.042,000216684964
      TCFY4821SEAAMML97MV1005A21DH19.012.010.042,000216684963
      TCFY4821SEAAMML98MV1005A21UP19.011.710.042,000216684962
      TCFY4821SEAAMML97MV0855A21DH19.012.010.042,000216684961
      TCFY4821SEAAMML98MV0855A21UP19.012.010.042,000216684959
      TCFY4821SEAAMML802V0755A21DZ19.012.010.041,500216684957
      TCFY4821SEAAMML802V0755A21UH19.012.010.042,000216684956
      TCFY4821SEAAMML802V0754A17UH19.012.010.042,000216684955
      TCFY4821SEAAMML802V1005A21UH19.012.010.041,500216684954
      TCFY4821SEAAMML802V1005A21DZ19.012.010.041,500216684953
      TCFY4821SEAAMML802V0754A17DZ19.011.710.042,000216684952
      TCFY4821SEAAMML962V1005A21M418.012.010.042,000216684960
      TCFY4821SEAAMML962V0705A21M418.012.010.042,000216684958
      Yearly running cost in 10 large cities$1,124-$2,900

      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 MLP19AY48AJVC?
      The Mainline MLP19AY48AJVC is rated at up to 19.0 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 14 certified matchups SEER2 ranges from 18.0-19.0.
      Is the Mainline MLP19AY48AJVC 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 4-ton model.
      How much does the Mainline MLP19AY48AJVC cost to run per year?
      At its rated efficiency it costs about $1,124-$2,900 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,371 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 Mainline MLP19AY48AJVC?
      ENERGY STAR lists 14 certified combinations for this outdoor unit. The highest-rated ones use MLHMVY4821SEACA, TCFY4821SEAAM.
      What refrigerant does the Mainline MLP19AY48AJVC 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 $1,353/yrYou save $994/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 MLP19AY48AJVC
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,353
      Current system, per year
      $2,346
      You save per year
      $994
      Payback
      17.1 years
      Net after 10 years
      -$7,065

      Cooling $843Heating $510Electricity used: 8,453 kWhSaved vs. a minimum-efficiency heat pump: $447

      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 15, 2026. How we use the data.