HVAC Rated
    Menu

      4-ton central heat pump · W Series

      Rheem WP15AY48AJ2N

      Below average cooling and heating efficiency for a 4-ton central heat pump, and certified for cold climates.

      Ranks #246 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,488 a year to run in a mixed climate like Atlanta.

      SEER2
      16.0 Cooling efficiency over a season
      Below average · beats 26%
      HSPF2
      8.1 Heating efficiency over a season
      Below average · beats 20%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      23,400 BTU/h51% of its 47°F output
      Very good · beats 76%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 23,400 BTU/h at 5°F.

      Think twice if…

      • 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

      Specifications4 ton, R-454B
      General
      BrandRheem
      Also sold asRuud, Fujitsu, WeatherKing
      Outdoor unit modelWP15AY48AJ2N
      SeriesW Series
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceAugust 19, 2024
      Last certifiedApril 9, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity45,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F45,500 BTU/h
      Capacity at 17°F29,600-30,000 BTU/h
      Capacity at 5°F23,000-23,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder51% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RH2VY4824STACN at the standard test temperatures, in BTU/h:

      Certified matchups8 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.
      RH2VY4824STACN · cold climate16.011.78.123,400216030744
      RH2VY4824STACN · cold climate16.011.78.123,400216030747
      RH2TY4824STANN · cold climate15.211.78.123,000216581275
      RH2TY4824STANN · cold climate15.211.78.123,000216581277
      FHRNTT4821S*YTNA15.211.77.8-215415494
      WH2TY4821STANN15.211.77.8-215415454
      RH2TY4821STANN15.211.77.8-215415468
      RH2TY4821STANN15.211.77.8-215415469
      Yearly running cost in 10 large cities$1,336-$3,553

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

      Questions5
      What is the SEER2 rating of the Rheem WP15AY48AJ2N?
      The Rheem WP15AY48AJ2N is rated at up to 16.0 SEER2 and 11.7 EER2 for cooling and up to 8.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 8 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Rheem WP15AY48AJ2N good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 23,400 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Rheem WP15AY48AJ2N cost to run per year?
      At its rated efficiency it costs about $1,336-$3,553 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,644 in Phoenix and $2,966 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 Rheem WP15AY48AJ2N?
      ENERGY STAR lists 8 certified combinations for this outdoor unit. The highest-rated ones use RH2VY4824STACN, RH2TY4824STANN, FHRNTT4821S*YTNA.
      What refrigerant does the Rheem WP15AY48AJ2N 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 $1,630/yrYou save $716/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 Rheem WP15AY48AJ2N
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,630
      Current system, per year
      $2,346
      You save per year
      $716
      Payback
      23.7 years
      Net after 10 years
      -$9,840

      Cooling $1,001Heating $629Electricity used: 10,188 kWhSaved vs. a minimum-efficiency heat pump: $169

      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 4 ton models

      See all 319 4 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of April 9, 2025. How we use the data.