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      1.5-ton central heat pump · VERSUS

      Rheem WP15AY18AJ2N

      Below average cooling and heating efficiency for a 1.5-ton central heat pump, and certified for cold climates.

      Ranks #154 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $570 a year to run in a mixed climate like Atlanta.

      SEER2
      15.2 Cooling efficiency over a season
      Below average · beats 6%
      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
      8,600 BTU/h50% of its 47°F output
      Below average · beats 39%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 8,600 BTU/h at 5°F.
      • You want a choice of indoor units - 12 certified pairings.

      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

      Specifications1.5 ton, R-454B
      General
      BrandRheem
      Also sold asRuud, WeatherKing, Fujitsu
      Outdoor unit modelWP15AY18AJ2N
      SeriesVERSUS
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceAugust 6, 2024
      Last certifiedFebruary 27, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better15.2 (range 15.2)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity17,100 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F17,100 BTU/h
      Capacity at 17°F10,900-17,100 BTU/h
      Capacity at 5°F8,200-8,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.90-2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder50% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RF2TY2421STANS at the standard test temperatures, in BTU/h:

      Certified matchups12 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.
      RF2TY2421STANS · cold climate-15.211.78.18,600216533408
      RF2TY2421STANS · cold climate-15.211.78.18,600216533405
      RF2TY2421STANS · cold climate-15.211.78.18,600216533411
      FHFSTT2421S*YTNA · cold climate-15.211.78.18,600216685656
      WH2TY2417STANN-15.211.77.8-215486997
      RH2TY2417STANN-15.211.77.8-215487008
      RH2TY2417STANN-15.211.77.8-215487009
      FHRNTT2417S*YTNA-15.211.77.88,200215574160
      RCFY2417STANMU98MV0603A17UPS15.211.77.8-215657766
      RCFY2417STANMR97MV0603A17DH15.211.77.8-215657772
      RCFY2417STANMR98MV0603A17UP15.211.77.8-215657773
      RCFY2417STANMU97MV0603A17DHS15.211.77.8-215657775
      Yearly running cost in 10 large cities$528-$1,349

      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 WP15AY18AJ2N?
      The Rheem WP15AY18AJ2N is rated at up to 15.2 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.
      Is the Rheem WP15AY18AJ2N good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,600 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Rheem WP15AY18AJ2N cost to run per year?
      At its rated efficiency it costs about $528-$1,349 a year in electricity in large U.S. cities, depending on climate and local rates - for example $642 in Phoenix and $1,120 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 WP15AY18AJ2N?
      ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use RF2TY2421STANS, FHFSTT2421S*YTNA, WH2TY2417STANN.
      What refrigerant does the Rheem WP15AY18AJ2N 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 $632/yrYou save $249/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 WP15AY18AJ2N
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $632
      Current system, per year
      $882
      You save per year
      $249
      Payback
      26.1 years
      Net after 10 years
      -$4,007

      Cooling $396Heating $236Electricity used: 3,953 kWhSaved vs. a minimum-efficiency heat pump: $44

      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 February 27, 2026. How we use the data.