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      3-ton central heat pump · LX SERIES

      Luxaire THF2B36T21

      Below average cooling and heating efficiency for a 3-ton central heat pump, and certified for cold climates.

      Ranks #234 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,131 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
      20,000 BTU/h54% of its 47°F output
      Excellent · beats 97%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 20,000 BTU/h at 5°F.
      • You want a choice of indoor units - 1,095 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

      Specifications3 ton, R-410A
      General
      BrandLuxaire
      Also sold asColeman, Fraser-Johnston, Johnson Controls, CHAMPION HEATING AND COOLING
      Outdoor unit modelTHF2B36T21
      SeriesLX SERIES
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceMay 18, 2023
      Last certifiedJuly 15, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity33,400-36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F32,600-34,800 BTU/h
      Capacity at 17°F21,400-23,800 BTU/h
      Capacity at 5°F16,500-20,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.96-2.44
      ENERGY STAR cold climateYes
      Heating output as it gets colder54% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with XAHC36DBCN1 at the standard test temperatures, in BTU/h:

      Certified matchups1,095 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 1,095 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      XAHC36DBCN1Z8ES080C20SMPS116.011.78.118,300212485545
      XAHC36DBCN1Z8ES120C16LMPS116.011.78.118,500212478022
      XAHC36DBCN1Z8ES080C20SMPS116.011.78.118,300212485544
      XAHC36DBCN1Z8ES080C16LMPS116.011.78.118,300212475474
      XAHC36DBCN1Z8ES080C20LMPS116.011.78.118,300212485551
      XAHC36DBCN1Z8ES120C16SMPS116.011.78.118,500212478018
      XAHC36DBCN1Z8ES120C16SMPS116.011.78.118,500212478017
      XAHC36DBCN1Z8ES080C20SMPS116.011.78.118,300212485548
      XAHC36DBCN1Z8ES120C16SMPS116.011.78.118,500212478016
      XAHC36DBCN1Z8ES120C16LMPS116.011.78.118,500212478024
      XAHC36DBCN1Z8ES120C16LMPS116.011.78.118,500212478023
      XAHC36DBCN1Z8ES120C16SMPS116.011.78.118,500212478020
      XAHC36DBCN1Z8ES120C16LMPS116.011.78.118,500212478027
      XAHC36DBCN1Z8ES120C16LMPS116.011.78.118,500212478021
      XAHC36DBCN1Z8ES120C16SMPS116.011.78.118,500212478019
      XAHC36DBCN1Z8ES080C20LMPS116.011.78.118,300212485555
      XAHC36DBCN1Z8ES080C16SMPS116.011.78.118,300212475462
      XAHC36DBCN1Z8ES080C16SMPS116.011.78.118,300212475464
      XAHC36DBCN1Z8ES080C16SMPS116.011.78.118,300212475466
      XAHC36DBCN1Z8ES080C16SMPS116.011.78.118,300212475468
      XAHC36DBCN1Z8ES080C16SMPS116.011.78.118,300212475470
      XAHC36DBCN1Z8ES080C16LMPS116.011.78.118,300212475472
      XAHC36DBCN1Z8ES080C16LMPS116.011.78.118,300212475478
      XAHC36DBCN1Z8ES080C16LMPS116.011.78.118,300212475476
      XAHC36DBCN1Z8ES080C16LMPS116.011.78.118,300212475484
      XAHC36DBCN1Z8ES080C20SMPS116.011.78.118,300212485546
      XAHC36DBCN1Z8ES080C20SMPS116.011.78.118,300212485547
      XAHC36DBCN1Z8ES080C20LMPS116.011.78.118,300212485549
      XAHC36DBCN1Z8ES080C20LMPS116.011.78.118,300212485550
      XAHC36DBCN1Z8ES080C20LMPS116.011.78.118,300212485552
      XAHD48FBCN1+JMVT20DC2N1-16.012.08.117,200210343560
      XAHD48FBCN1+JMVT20DC2N1-16.012.08.117,200210343561
      XAHD48FBCN1+JMVT20DC2N1-16.012.08.117,200210343562
      XAHD48FBCN1+JMVT20DC2N1-16.012.08.117,200210343563
      XAHC36DBCN1+JMVT17CC2N1-16.011.78.117,400210358459
      XAHC36DBCN1+JMVT17CC2N1-16.011.78.117,400210358458
      XAHC36DBCN1+JMVT17CC2N1-16.011.78.117,400210358457
      XAHC36DBCN1+JMVT17CC2N1-16.011.78.117,400210358456
      XAHC36DBCN1+JMVT17CC2N1-16.011.78.117,400210846624
      XAHD48FBCN1+JMVT20DC2N1-16.012.08.117,200210848072
      XAHC36DBCN1Z8ET080C16LMPS116.011.78.118,600212593946
      XAHC36DBCN1Z8ET080C16LMPS116.011.78.118,600212593947
      XAHC36DBCN1Z8ET080C16LMPS116.011.78.118,600212593950
      XAHC36DBCN1Z8ET080C16LMPS116.011.78.118,600212593949
      XAHC36DBCN1Z8ET080C16LMPS116.011.78.118,600212593948
      XAHD48FBCN1Z8ET080C16LMPS116.012.08.118,000212594243
      XAHD48FBCN1Z8ET080C16LMPS116.012.08.118,000212594242
      XAHD48FBCN1Z8ET080C16LMPS116.012.08.118,000212594245
      XAHD48FBCN1Z8ET080C16LMPS116.012.08.118,000212594246
      XAHD48FBCN1Z8ET080C16LMPS116.012.08.118,000212594244
      XAHC36DBCN1Z8ET100C16LMPS116.011.78.118,400212594349
      XAHC36DBCN1Z8ET100C16LMPS116.011.78.118,400212594348
      XAHC36DBCN1Z8ET100C16LMPS116.011.78.118,400212594347
      XAHC36DBCN1Z8ET100C16LMPS116.011.78.118,400212594350
      XAHC36DBCN1Z8ET100C16LMPS116.011.78.118,400212594351
      XAHC36DBCN1Z8ET100C20LMPS116.011.78.118,300212594518
      XAHC36DBCN1Z8ET100C20LMPS116.011.78.118,300212594519
      XAHC36DBCN1Z8ET100C20LMPS116.011.78.118,300212594517
      XAHC36DBCN1Z8ET100C20LMPS116.011.78.118,300212594521
      XAHC36DBCN1Z8ET100C20LMPS116.011.78.118,300212594520
      Yearly running cost in 10 large cities$1,033-$2,686

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

      Questions5
      What is the SEER2 rating of the Luxaire THF2B36T21?
      The Luxaire THF2B36T21 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 1095 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Luxaire THF2B36T21 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 20,000 BTU/h at 5°F with a COP of 2.44, so it is still 2.4 times as efficient as electric resistance heat at that temperature.
      How much does the Luxaire THF2B36T21 cost to run per year?
      At its rated efficiency it costs about $1,033-$2,686 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,263 in Phoenix and $2,236 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 Luxaire THF2B36T21?
      ENERGY STAR lists 1095 certified combinations for this outdoor unit. The highest-rated ones use XAHC36DBCN1, XAHD48FBCN1+JMVT20DC2N1, XAHC36DBCN1+JMVT17CC2N1.
      What refrigerant does the Luxaire THF2B36T21 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 $1,247/yrYou save $551/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 Luxaire THF2B36T21
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,247
      Current system, per year
      $1,799
      You save per year
      $551
      Payback
      23.6 years
      Net after 10 years
      -$7,487

      Cooling $774Heating $473Electricity used: 7,796 kWhSaved vs. a minimum-efficiency heat pump: $130

      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 July 15, 2026. How we use the data.