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      1.5-ton central heat pump · W Series

      WeatherKing WP15AZ18AJ2N

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

      Ranks #124 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $559 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
      9,500 BTU/h47% of its 47°F output
      Average · beats 58%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 9,500 BTU/h at 5°F.
      • You want a choice of indoor units - 55 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.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications1.5 ton, R-410A
      General
      BrandWeatherKing
      Also sold asRuud, Rheem, Fujitsu
      Outdoor unit modelWP15AZ18AJ2N
      SeriesW Series
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceFebruary 27, 2023
      Last certifiedJuly 7, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      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°F11,000-12,100 BTU/h
      Capacity at 5°F8,100-9,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.10
      ENERGY STAR cold climateYes
      Heating output as it gets colder47% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with WH3VZ2417STANN at the standard test temperatures, in BTU/h:

      Certified matchups55 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.
      WH3VZ2417STANN-16.011.77.88,100214779510
      RH3VZ2417STACN-16.011.77.88,100214664590
      RH3VZ2417STACN-16.011.77.88,100214664588
      RCFZ2417STANMR96VA0702317M15.211.78.1-212404540
      TCFZ2417STANM · cold climateW962W0703A17M4S15.211.78.19,300212404546
      RCFZ2417STANMU96VA0602317M15.211.78.1-212404539
      TCFZ2417STANMW96VA0602317M15.211.78.1-212404534
      TCFZ2417STANMW96VA0702317M15.211.78.1-212404541
      RCFZ2417STANM · cold climateR962V0703A17M4S15.211.78.19,300212404537
      RCFZ2417STANMU96VA0702317M15.211.78.1-212404543
      RCFZ2417STANM · cold climateR962V0703A17M4S15.211.78.19,300212404536
      RCFZ2417STANM · cold climateR951V0603A17UHU15.211.78.19,500212941568
      RCFZ2417STANM · cold climateR951V0603A17UHU15.211.78.19,500212941521
      TCFZ2417STANM · cold climateW951W0603A17UHU15.211.78.19,500212941545
      FCCN2417SZTA · cold climateFF96TV307017M4S*A15.211.78.19,300212507755
      RCFZ2417STANM · cold climateW962W0703A17M4S15.211.78.19,300214326584
      RCFZ2417STANM · cold climateW951W0603A17UHU15.211.78.19,500214326658
      FHRNTT2417S*ZTNA-15.211.77.89,200211641682
      RH2TZ2417STANN-15.211.77.89,200211627519
      WH2TZ2417STANN-15.211.77.89,200211627520
      RH2TZ2417STANN-15.211.77.89,200211627518
      TCFZ2417STANMW962W0403A17M4S15.211.77.89,300212404542
      TCFZ2417STANMW951W0403A17M4S15.211.77.89,300212404490
      TCFZ2417STANMW951W0403A17UHU15.211.77.89,500212404488
      RCFZ2417STANMR951V0603A17M4S15.211.77.89,400212404487
      RCFZ2417STANMR951V0403A17M4S15.211.77.89,300212404492
      RCFZ2417STANMR962V0603A17M4S15.211.77.89,400212404532
      RCFZ2417STANMR951V0603A17M4S15.211.77.89,400212404493
      RCFZ2417STANMR951V0403A17UHU15.211.77.89,500212404485
      RCFZ2417STANMR951V0403A17UHU15.211.77.89,500212404480
      RCFZ2417STANMR951V0403A17M4S15.211.77.89,300212404484
      TCFZ2417STANMW962W0603A17M4S15.211.77.89,400212404545
      TCFZ2417STANMW951W0603A17M4S15.211.77.89,400212404482
      RCFZ2417STANMR962V0603A17M4S15.211.77.89,400212404533
      RCFZ2417STANMR962V0403A17M4S15.211.77.89,300212404538
      RCFZ2417STANMR962V0403A17M4S15.211.77.89,300212404535
      TCFZ2417STANMW802VA075317Z15.211.77.8-212404370
      RCFZ2417STANMR951V0703A17M4S15.211.77.89,400212941570
      RCFZ2417STANMR951V0703A17M4S15.211.77.89,400212941562
      TCFZ2417STANMW951W0703A17M4S15.211.77.89,400212941550
      WH2TZ2417STANN-15.211.77.89,200213318041
      WH2TZ2417STANN-15.211.77.89,200213318051
      RF2TZ2421STANS-15.211.77.88,400213082126
      RF2TZ2421STANS-15.211.77.88,400213082129
      RF2TZ2421STANS-15.211.77.88,400213082131
      FCCN2417SZTAFF95SV306017M4S*A15.211.77.89,400212507733
      FCCN2417SZTAFF95SV304017M4S*A15.211.77.89,300212507737
      FCCN2417SZTAFF96TV304017M4S*A15.211.77.89,300212507753
      FCCN2417SZTAFF96TV306017M4S*A15.211.77.89,400212507754
      RCFZ2417STANMW951W0603A17M4S15.211.77.89,400214326564
      RCFZ2417STANMW951W0403A17UHU15.211.77.89,500214326567
      RCFZ2417STANMW951W0403A17M4S15.211.77.89,300214326568
      RCFZ2417STANMW962W0603A17M4S15.211.77.89,400214326583
      RCFZ2417STANMW962W0403A17M4S15.211.77.89,300214326582
      RCFZ2417STANMW951W0703A17M4S15.211.77.89,400214326659
      Yearly running cost in 10 large cities$502-$1,335

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

      Questions5
      What is the SEER2 rating of the WeatherKing WP15AZ18AJ2N?
      The WeatherKing WP15AZ18AJ2N 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 55 certified matchups SEER2 ranges from 15.2-16.0.
      Is the WeatherKing WP15AZ18AJ2N good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 9,500 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the WeatherKing WP15AZ18AJ2N cost to run per year?
      At its rated efficiency it costs about $502-$1,335 a year in electricity in large U.S. cities, depending on climate and local rates - for example $618 in Phoenix and $1,115 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 WeatherKing WP15AZ18AJ2N?
      ENERGY STAR lists 55 certified combinations for this outdoor unit. The highest-rated ones use WH3VZ2417STANN, RH3VZ2417STACN, RCFZ2417STANM.
      What refrigerant does the WeatherKing WP15AZ18AJ2N use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $613/yrYou save $269/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 WeatherKing WP15AZ18AJ2N
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $613
      Current system, per year
      $882
      You save per year
      $269
      Payback
      24.2 years
      Net after 10 years
      -$3,809

      Cooling $376Heating $236Electricity used: 3,829 kWhSaved vs. a minimum-efficiency heat pump: $64

      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 1.5 ton models

      See all 170 1.5 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 7, 2026. How we use the data.