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      2-ton central heat pump · TZID Series

      Thermal Zone TZID24H520ZCS

      Very good cooling and heating efficiency for a 2-ton central heat pump, and certified for cold climates.

      Ranks #116 of 331 2 ton central heat pumps for cooling efficiency, and costs about $674 a year to run in a mixed climate like Atlanta.

      SEER2
      18.4 Cooling efficiency over a season
      Very good · beats 75%
      HSPF2
      9.9 Heating efficiency over a season
      Very good · beats 80%
      EER2
      10.8 Cooling efficiency on a 95°F day
      Below average · beats 19%
      Heat at 5°F
      21,600 BTU/h84% of its 47°F output
      Below average · beats 20%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 75% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 21,600 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 80% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications2 ton, R-454B
      General
      BrandThermal Zone
      Outdoor unit modelTZID24H520ZCS
      SeriesTZID Series
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 20, 2025
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.4 (range 15.2-18.4)
      EER2Efficiency at 95°F outdoors9.7-11.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5-9.9
      Capacity at 47°F24,000-26,000 BTU/h
      Capacity at 17°F18,000-20,800 BTU/h
      Capacity at 5°F19,000-21,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75-1.90
      ENERGY STAR cold climateYes
      Heating output as it gets colder84% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with TZID24H520ZACB 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.
      TZID24H520ZACB · cold climateRG19080B12MPS118.410.89.921,000218079838
      TZID24H520ZAM · cold climate-18.111.09.721,600218043394
      TZID24H520ZACB · cold climateMGV96U060B3C17.810.89.220,000218079689
      TZID24H520ZACA · cold climateRL18060A12MPS117.710.59.421,000218782198
      TZID24H520ZACB · cold climateMGV96U080B3C17.610.79.120,000218079690
      TZID24H520ZACA · cold climateGR9T960403AN17.610.39.121,000218782208
      TZID24H520ZACA · cold climateRG19040A10MPS117.510.18.820,000218782189
      TZID24H520ZACA · cold climateGR9T960303AN17.410.29.221,000218782207
      TZID24H520ZACB · cold climateS9V2B060D3VS***17.210.58.520,000218079681
      TZID24H520ZACB · cold climateS9V2B060U4VS***17.210.58.520,000218079680
      TZID24H520ZACB · cold climateS9V2B040U3VS***17.210.58.520,000218079679
      TZID24H520ZACB · cold climateRL18080B12MPS117.110.99.320,000218079854
      TZID24H520ZACB · cold climateS9V2B080D4VS***17.110.59.120,000218079779
      TZID24H520ZACA · cold climateGR9S920403AN17.110.39.120,000218782205
      TZID24H520ZACB · cold climateS9V2B040D3VS***17.110.49.020,000218079778
      TZID24H520ZACB · cold climateGD9S960603BN17.010.39.320,000218079985
      TZID24H520ZACB · cold climateML193DF070XE36B*17.010.49.120,000218079968
      TZID24H520ZACA · cold climateRL18040A12MPS116.910.69.220,000218782197
      TZID24H520ZACB · cold climateML193DF045XE36B*16.910.49.020,000218079967
      TZID24H520ZACB · cold climateS9X2B040D3PSB**16.810.39.020,000218079812
      TZID24H520ZACB · cold climateS9X1B040D3PSB**16.810.39.020,000218079780
      TZID24H520ZACB · cold climateRG19060B12MPS116.710.69.621,000218079819
      TZID24H520ZACA · cold climateRG19060A10MPS116.710.19.321,000218782190
      TZID24H520ZACB · cold climateML296UH070XV36B*16.710.29.220,000218079977
      TZID24H520ZACB · cold climateMGV80M080B4A16.710.49.220,000218079725
      TZID24H520ZACA · cold climateC45-2-V16.610.09.120,000218782174
      TZID24H520ZACB · cold climateML296UH045XV36B*16.610.19.020,000218079976
      TZID24H520ZACB · cold climateML193UH070XE36B*16.610.38.920,000218079971
      TZID24H520ZACB · cold climateML193UH030XE36B*16.610.38.920,000218079969
      TZID24H520ZACA · cold climateGR9T960603AN16.510.39.221,000218782209
      TZID24H520ZACB · cold climateMGV80M060B4A16.510.39.120,000218079724
      TZID24H520ZACB · cold climateC60-2-V16.410.49.320,000218079703
      TZID24H520ZACB · cold climateS9X2B040U3PSB**16.410.49.120,000218079813
      TZID24H520ZACB · cold climateS9X1B040U3PSB**16.410.49.120,000218079781
      TZID24H520ZACB · cold climateML296DF045XV36B*16.310.09.120,000218079975
      TZID24H520ZACA · cold climateMGV80M060A3A16.310.29.120,000218782182
      TZID24H520ZACB · cold climateGR9S920603BN16.210.49.320,000218079978
      TZID24H520ZACB · cold climateML196UH045XE36B*16.210.39.120,000218079973
      TZID24H520ZACA · cold climateGR9S960403AN16.210.29.121,000218782206
      TZID24H520ZACB · cold climateGD9T960603BN16.110.39.320,000218079987
      TZID24H520ZACB · cold climateGR9T960803BN16.010.39.220,000218079983
      TZID24H520ZACB · cold climate-16.010.09.019,000218043395
      TZID24H520ZACB · cold climateML196UH070XE36B*16.010.49.020,000218079974
      TZID24H520ZACA · cold climate-16.010.09.019,000218782166
      TZID24H520ZACA · cold climateMGV80M040A3A16.010.08.920,000218782181
      TZID24H520ZACB · cold climateGD9T960803BN15.910.29.320,000218079988
      TZID24H520ZACB · cold climateGR9S960803BN15.910.39.320,000218079981
      TZID24H520ZACB · cold climateGR9S920803BN15.910.39.320,000218079979
      TZID24H520ZACB · cold climateGR9S960603BN15.910.39.220,000218079980
      TZID24H520ZACB · cold climateML193UH045XE36B*15.910.39.120,000218079970
      TZID24H520ZACA · cold climateC30-2-V15.99.79.020,000218782173
      TZID24H520ZACB · cold climateGD9T960403BN15.810.29.220,000218079986
      TZID24H520ZACB · cold climateGD9S960403BN15.810.29.220,000218079984
      TZID24H520ZACB · cold climateGR9T960603BN15.810.39.220,000218079982
      TZID24H520ZACB · cold climateC75-2-V15.310.19.121,000218079704
      TZID24H520ZACB · cold climateML196DF070XE48B*15.210.28.820,000218079972
      Yearly running cost in 10 large cities$612-$1,604

      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 TZID24H520ZCS?
      The Thermal Zone TZID24H520ZCS is rated at up to 18.4 SEER2 and 10.8 EER2 for cooling and up to 9.9 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 56 certified matchups SEER2 ranges from 15.2-18.4.
      Is the Thermal Zone TZID24H520ZCS good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,600 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the Thermal Zone TZID24H520ZCS cost to run per year?
      At its rated efficiency it costs about $612-$1,604 a year in electricity in large U.S. cities, depending on climate and local rates - for example $750 in Phoenix and $1,336 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 TZID24H520ZCS?
      ENERGY STAR lists 56 certified combinations for this outdoor unit. The highest-rated ones use TZID24H520ZACB, TZID24H520ZAM, TZID24H520ZACA.
      What refrigerant does the Thermal Zone TZID24H520ZCS 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 $742/yrYou save $512/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 TZID24H520ZCS
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $742
      Current system, per year
      $1,254
      You save per year
      $512
      Payback
      17.6 years
      Net after 10 years
      -$3,881

      Cooling $459Heating $283Electricity used: 4,637 kWhSaved vs. a minimum-efficiency heat pump: $222

      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 September 22, 2026. How we use the data.