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      3.5-ton central heat pump · TS1

      TCL THH42HAI2NAF2U23

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

      Ranks #116 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,360 a year to run in a mixed climate like Atlanta.

      SEER2
      15.2 Cooling efficiency over a season
      Below average · beats 6%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      10.0 Cooling efficiency on a 95°F day
      Below average · beats 10%
      Heat at 5°F
      34,000 BTU/h83% of its 47°F output
      Below average · beats 5%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 34,000 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      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

      Specifications3.5 ton, R-410A
      General
      BrandTCL
      Outdoor unit modelTHH42HAI2NAF2U23
      SeriesTS1
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceMay 24, 2023
      Last certifiedAugust 16, 2024
      Cooling
      SEER2Seasonal efficiency, higher is better15.2 (range 15.2)
      EER2Efficiency at 95°F outdoors9.0-10.0
      Cooling capacity36,000-48,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.1-8.5
      Capacity at 47°F36,000-45,000 BTU/h
      Capacity at 17°F29,400-33,000 BTU/h
      Capacity at 5°F30,000-34,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75-1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder83% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with THH36IAI2NAF2H23 at the standard test temperatures, in BTU/h:

      Certified matchups3 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.
      THH36IAI2NAF2H23 · cold climate-15.210.08.530,000212617000
      THH48IAI2NAF2H23 · cold climate-15.29.08.134,000211603991
      4TXCC009DS3 · cold climateA801X080CM5SD15.29.58.133,400215374903
      Yearly running cost in 10 large cities$1,294-$3,188

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

      Questions5
      What is the SEER2 rating of the TCL THH42HAI2NAF2U23?
      The TCL THH42HAI2NAF2U23 is rated at up to 15.2 SEER2 and 10.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the TCL THH42HAI2NAF2U23 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 34,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the TCL THH42HAI2NAF2U23 cost to run per year?
      At its rated efficiency it costs about $1,294-$3,188 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,558 in Phoenix and $2,635 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 TCL THH42HAI2NAF2U23?
      ENERGY STAR lists 3 certified combinations for this outdoor unit. The highest-rated ones use THH36IAI2NAF2H23, THH48IAI2NAF2H23, 4TXCC009DS3.
      What refrigerant does the TCL THH42HAI2NAF2U23 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 $1,526/yrYou save $640/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 TCL THH42HAI2NAF2U23
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,526
      Current system, per year
      $2,166
      You save per year
      $640
      Payback
      25.0 years
      Net after 10 years
      -$9,604

      Cooling $973Heating $553Electricity used: 9,538 kWhSaved vs. a minimum-efficiency heat pump: $135

      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 August 16, 2024. How we use the data.