HVAC Rated
    Menu

      3.5-ton central heat pump · Performance

      Thermal Zone TZP15AY42AJ2N

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

      Ranks #83 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/h47% 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 - 56 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
      BrandThermal Zone
      Outdoor unit modelTZP15AY42AJ2N
      SeriesPerformance
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 23, 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 better8.1
      Capacity at 47°F40,000 BTU/h
      Capacity at 17°F40,000 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 colder47% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TCFY4824STANM at the standard test temperatures, in BTU/h:

      Certified matchups56 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.
      TCFY4824STANM · cold climateTZ80UH1V100C5U16.011.78.118,800216684571
      TCFY4821STANM · cold climateTZ80UH1V100C5U16.011.78.118,800216684564
      TCFY4824STANM · cold climateTZ80UH2V125D516.011.78.118,800216684580
      TCFY4821STANM · cold climateTZ80UH1V070B416.011.78.119,300216684568
      TCFY4824STANM · cold climateTZ96M42V070C515.211.78.119,100216684430
      TCFY4821STANM · cold climateTZ95M41V100C515.211.78.119,100216684236
      TCFY4821STANM · cold climateTZ92M41V085C515.211.78.119,200216684234
      TCFY4824STANM · cold climateTZ92M41V070C515.211.78.119,100216684235
      TCFY4824STANM · cold climateTZ95M41V115D515.211.78.118,800216684243
      TCFY4824STANM · cold climateTZ95M41V100C515.211.78.119,100216684242
      TCFY4821STANM · cold climateTZ92M41V070C515.211.78.119,100216684237
      TCFY4824STANM · cold climateTZ92M41V100C515.211.78.119,100216684244
      TCFY4824STANM · cold climateTZ92M41V115D515.211.78.118,800216684245
      TCFY4824STANM · cold climateTZ95UH1V100C515.211.78.119,000216684240
      TCFY4821STANM · cold climateTZ92M41V100C515.211.78.119,100216684238
      TCFY4824STANM · cold climateTZ92M41V085C515.211.78.119,200216684239
      TCFY4824STANM · cold climateTZ95M41V070C515.211.78.119,100216684241
      TCFY4824STANM · cold climateTZ95M41V085C515.211.78.119,200216684246
      TCFY4821STANM · cold climateTZ95M41V070C515.211.78.119,100216684249
      TCFY4821STANM · cold climateTZ95M41V085C515.211.78.119,200216684247
      TCFY4821STANM · cold climateTZ80UH1V075C515.211.78.118,900216684250
      TCFY4821STANM · cold climateTZ95UH1V100C515.211.78.119,000216684248
      TCFY4821STANM · cold climateTZ80UH1V075B415.211.78.118,800216684252
      TCFY4824STANM · cold climateTZ80UH1V100C5S15.211.78.118,800216684253
      TCFY4824STANM · cold climateTZ80UH1V150D515.211.78.118,800216684251
      TCFY4824STANM · cold climateTZ80DZ1V125D515.211.78.118,700216684255
      TCFY4824STANM · cold climateTZ80DZ1V075C515.211.78.118,800216684256
      TCFY4824STANM · cold climateTZ80UH2V075C515.211.78.118,900216684258
      TCFY4821STANM · cold climateTZ80DZ2V075B415.211.78.119,300216684257
      TCFY4824STANM · cold climateTZ80UH1V100C5N15.211.78.118,800216684261
      TCFY4821STANM · cold climateTZ80UH2V100C515.211.78.118,800216684265
      TCFY4824STANM · cold climateTZ80DZ2V125D515.211.78.118,700216684264
      TCFY4824STANM · cold climateTZ80UH1V075C515.211.78.118,900216684267
      TCFY4824STANM · cold climateTZ80UH2V150D515.211.78.118,800216684263
      TCFY4821STANM · cold climateTZ80UH2V100B415.211.78.119,000216684268
      TCFY4824STANM · cold climateTZ80DZ1V100C515.211.78.118,700216684259
      TCFY4824STANM · cold climateTZ80DZ2V100C515.211.78.118,700216684260
      TCFY4821STANM · cold climateTZ80DZ1V075B415.211.78.119,300216684270
      TCFY4821STANM · cold climateTZ80DZ2V100C515.211.78.118,700216684272
      TCFY4824STANM · cold climateTZ80UH1V125D515.211.78.118,800216684269
      TCFY4821STANM · cold climateTZ80UH1V100C5N15.211.78.118,800216684273
      TCFY4821STANM · cold climateTZ80DZ2V075C515.211.78.118,800216684274
      TCFY4821STANM · cold climateTZ80UH2V075C515.211.78.118,900216684271
      TCFY4821STANM · cold climateTZ80UH1V100C5S15.211.78.118,800216684278
      TCFY4821STANM · cold climateTZ80UH2V075B415.211.78.118,800216684280
      TCFY4824STANM · cold climateTZ80UH2V100C515.211.78.118,800216684276
      TCFY4821STANM · cold climateTZ80UH1V100B415.211.78.119,000216684277
      TCFY4824STANM · cold climateTZ80DZ2V075C515.211.78.118,800216684275
      TCFY4821STANM · cold climateTZ80DZ1V100C515.211.78.118,700216684279
      TCFY4821STANM · cold climateTZ96M42V100C515.211.78.119,100216684356
      TCFY4821STANM · cold climateTZ80DZ1V075C515.211.78.118,800216684281
      TCFY4824STANM · cold climateTZ96M42V085C515.211.78.119,200216684359
      TCFY4824STANM · cold climateTZ96M42V100C515.211.78.119,100216684360
      TCFY4824STANM · cold climateTZ96M42V115D515.211.78.118,800216684361
      TCFY4821STANM · cold climateTZ96M42V085C515.211.78.119,200216684358
      TCFY4821STANM · cold climateTZ96M42V070C515.211.78.119,100216684357
      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 Thermal Zone TZP15AY42AJ2N?
      The Thermal Zone TZP15AY42AJ2N 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 56 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Thermal Zone TZP15AY42AJ2N 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 Thermal Zone TZP15AY42AJ2N 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 Thermal Zone TZP15AY42AJ2N?
      ENERGY STAR lists 56 certified combinations for this outdoor unit. The highest-rated ones use TCFY4824STANM, TCFY4821STANM.
      What refrigerant does the Thermal Zone TZP15AY42AJ2N 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 Thermal Zone TZP15AY42AJ2N
      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.