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      3.5-ton central heat pump · VERSUS

      Friedrich FWP15AY42AJ2N

      Below average cooling and heating efficiency for a 3.5-ton central heat pump, and certified for cold climates.

      Ranks #73 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,308 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
      19,300 BTU/h48% 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 19,300 BTU/h at 5°F.
      • You want a choice of indoor units - 127 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

      Specifications3.5 ton, R-454B
      General
      BrandFriedrich
      Outdoor unit modelFWP15AY42AJ2N
      SeriesVERSUS
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceAugust 6, 2024
      Last certifiedApril 9, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.7
      Cooling capacity40,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F40,000 BTU/h
      Capacity at 17°F27,000-40,000 BTU/h
      Capacity at 5°F18,700-19,300 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder48% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RCFY4821STANM at the standard test temperatures, in BTU/h:

      Certified matchups127 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 127 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      RCFY4821STANM · cold climateFR801V1004A17UH16.011.78.119,000216543719
      RCFY4824STANM · cold climateFR801V1255A24DZ16.011.78.118,700216543724
      RCFY4821STANM · cold climateFR801V0754A17UH16.011.78.118,800216543707
      RCFY4821STANM · cold climateFR801V0754A17DZ16.011.78.119,300216543703
      RCFY4824STANM · cold climateFR801V1005A21UHN16.011.78.118,800216543712
      RCFY4821STANM · cold climateFR802V0755A21DZ16.011.78.118,800216544987
      RCFY4824STANM · cold climateFR802V1505A24UH16.011.78.118,800216544990
      RCFY4824STANM · cold climateFR802V1255A24DZ16.011.78.118,700216545051
      RCFY4824STANM · cold climateFR801V1505A24UH16.011.78.118,800216545056
      RCFY4824STANM · cold climateFR802V0755A21DZ16.011.78.118,800216545063
      RCFY4821STANM · cold climateFR802V1005A21DZ16.011.78.118,700216545058
      RCFY4821STANM · cold climateFR802V1005A21UH16.011.78.118,800216545066
      RCFY4821STANM · cold climateFR802V0754A17UH16.011.78.118,800216545061
      RCFY4824STANM · cold climateFR802V1005A21DZ16.011.78.118,700216545068
      RCFY4821STANM · cold climateFR802V0755A21UH16.011.78.118,900216545070
      RCFY4821STANM · cold climateFR802V1004A17UH16.011.78.119,000216545122
      RCFY4824STANM · cold climateFR802V1005A21UH16.011.78.118,800216545125
      RCFY4824STANM · cold climateFR802V0755A21UH16.011.78.118,900216545127
      RCFY4821STANM · cold climateFR802V0754A17DZ16.011.78.119,300216545129
      TCFY4824STANM · cold climateFR801V1505A24UH16.011.78.118,800216545141
      RCFY4824STANM · cold climateFR802V1255A24UH16.011.78.118,800216545201
      RCFY4821STANM · cold climateFR801V1005A21UHU16.011.78.118,800216544482
      RCFY4821STANM · cold climateFR801V0704A17UH16.011.78.119,300216544487
      RCFY4824STANM · cold climateFR962V0855A21M416.011.78.119,200216544491
      RCFY4824STANM · cold climateFR801V1005A21UHU16.011.78.118,800216544489
      RCFY4824STANM · cold climateFR962V1155A24M416.011.78.118,800216544498
      RCFY4821STANM · cold climateFR962V0855A21M416.011.78.119,200216544504
      RCFY4821STANM · cold climateFR962V0705A21M416.011.78.119,100216544502
      RCFY4821STANM · cold climateFR962V1005A21M416.011.78.119,100216544507
      RCFY4824STANM · cold climateFR801V0755A21DZ16.011.78.118,800216543598
      RCFY4821STANM · cold climateFR801V0755A21DZ16.011.78.118,800216543664
      RCFY4821STANM · cold climateFR801V1005A21UHS16.011.78.118,800216543666
      RCFY4821STANM · cold climateFR801V0755A21UH16.011.78.118,900216543671
      RCFY4824STANM · cold climateFR801V1005A21DZ16.011.78.118,700216543884
      RCFY4824STANM · cold climateFR801V1005A21UHS16.011.78.118,800216543882
      RCFY4821STANM · cold climateFR801V1005A21UHN16.011.78.118,800216543880
      RCFY4821STANM · cold climateFR951V0705A21M416.011.78.119,100216543160
      RCFY4824STANM · cold climateFR951V0705A21UHU16.011.78.119,100216543163
      RCFY4824STANM · cold climateFR921V0855A21M416.011.78.119,200216543165
      RCFY4824STANM · cold climateFR962V1005A21M416.011.78.119,100216544645
      RCFY4824STANM · cold climateFR962V0705A21M416.011.78.119,100216544647
      RCFY4824STANM · cold climateFR951V0855A21M416.011.78.119,200216543154
      RCFY4821STANM · cold climateFR951V1005A21M416.011.78.119,100216543156
      RCFY4821STANM · cold climateFR951V1005A21UH16.011.78.119,000216543151
      RCFY4824STANM · cold climateFR921V1155A24M416.011.78.118,800216543158
      RCFY4824STANM · cold climateFR951V0705A21M416.011.78.119,100216543442
      RCFY4824STANM · cold climateFR951V1005A21M416.011.78.119,100216543447
      RCFY4821STANM · cold climateFR921V1005A21M416.011.78.119,100216543445
      RCFY4824STANM · cold climateFR951V1155A24M416.011.78.118,800216543449
      RCFY4821STANM · cold climateFR921V0855A21M416.011.78.119,200216543451
      RCFY4821STANM · cold climateFR951V0855A21M416.011.78.119,200216543454
      RCFY4824STANM · cold climateFR921V1005A21M416.011.78.119,100216543456
      RCFY4824STANM · cold climateFR951V1005A21UH16.011.78.119,000216543497
      RCFY4821STANM · cold climateFR951V0705A21UHU16.011.78.119,100216543499
      RCFY4824STANM · cold climateFR921V0705A21M416.011.78.119,100216543502
      RCFY4821STANM · cold climateFR921V0705A21M416.011.78.119,100216543513
      RCFY4824STANM · cold climateFR801V1255A24UH16.011.78.118,800216543517
      RCFY4821STANM · cold climateFR801V1005A21DZ16.011.78.118,700216543515
      RCFY4824STANM · cold climateFR801V0755A21UH16.011.78.118,900216543520
      RCFY4821STANMFR98MV1005A21UP16.011.77.8-216544493
      Yearly running cost in 10 large cities$1,175-$3,124

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

      Questions5
      What is the SEER2 rating of the Friedrich FWP15AY42AJ2N?
      The Friedrich FWP15AY42AJ2N 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 127 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Friedrich FWP15AY42AJ2N good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,300 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 Friedrich FWP15AY42AJ2N cost to run per year?
      At its rated efficiency it costs about $1,175-$3,124 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,446 in Phoenix and $2,608 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 Friedrich FWP15AY42AJ2N?
      ENERGY STAR lists 127 certified combinations for this outdoor unit. The highest-rated ones use RCFY4821STANM, RCFY4824STANM, TCFY4824STANM.
      What refrigerant does the Friedrich FWP15AY42AJ2N 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 $1,433/yrYou save $629/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 Friedrich FWP15AY42AJ2N
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,433
      Current system, per year
      $2,063
      You save per year
      $629
      Payback
      23.8 years
      Net after 10 years
      -$8,706

      Cooling $880Heating $553Electricity used: 8,957 kWhSaved vs. a minimum-efficiency heat pump: $149

      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 April 9, 2025. How we use the data.