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      3.5-ton central heat pump · CLASSIC

      Whirlpool WLP15AY42AJ2N

      Below average cooling and heating efficiency for a 3.5-ton central heat pump, but not rated for cold climates.

      Ranks #138 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,366 a year to run in a mixed climate like Atlanta.

      SEER2
      15.2 Cooling efficiency over a season
      Below average · beats 6%
      HSPF2
      7.8 Heating efficiency over a season
      Below average · beats 5%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      19,700 BTU/h49% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want a certified 3.5-ton central heat pump at a typical efficiency level.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • Cooling cost matters most - its SEER2 is below average for central heat pumps.
      • You mainly need heat - its HSPF2 is below average for central heat pumps.

      Calculate my running cost

      Details

      Specifications3.5 ton, R-454B
      General
      BrandWhirlpool
      Outdoor unit modelWLP15AY42AJ2N
      SeriesCLASSIC
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJune 23, 2025
      Last certifiedJuly 1, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better15.2 (range 15.2)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity40,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8
      Capacity at 47°F40,000 BTU/h
      Capacity at 17°F27,000 BTU/h
      Capacity at 5°F19,700 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder49% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with WLH2TY4821STANN at the standard test temperatures, in BTU/h:

      Certified matchups1 indoor units

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

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      WLH2TY4821STANN15.211.77.819,700217536711
      Yearly running cost in 10 large cities$1,236-$3,252

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

      Questions5
      What is the SEER2 rating of the Whirlpool WLP15AY42AJ2N?
      The Whirlpool WLP15AY42AJ2N is rated at up to 15.2 SEER2 and 11.7 EER2 for cooling and up to 7.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Whirlpool WLP15AY42AJ2N 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 3.5-ton model.
      How much does the Whirlpool WLP15AY42AJ2N cost to run per year?
      At its rated efficiency it costs about $1,236-$3,252 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,516 in Phoenix and $2,712 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 Whirlpool WLP15AY42AJ2N?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses WLH2TY4821STANN.
      What refrigerant does the Whirlpool WLP15AY42AJ2N 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 $1,501/yrYou save $562/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 Whirlpool WLP15AY42AJ2N
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,501
      Current system, per year
      $2,063
      You save per year
      $562
      Payback
      26.7 years
      Net after 10 years
      -$9,382

      Cooling $926Heating $574Electricity used: 9,379 kWhSaved vs. a minimum-efficiency heat pump: $81

      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 3.5 ton models

      See all 138 3.5 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 1, 2025. How we use the data.