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      3.5-ton central heat pump · 16 Single-Stage Heat Pump with WeatherGuard Top

      Trane 5TWX6042A1

      Below average cooling and heating efficiency for a 3.5-ton central heat pump, but not rated for cold climates.

      Ranks #84 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,298 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
      12.0 Cooling efficiency on a 95°F day
      Average · beats 64%
      Heat at 5°F
      19,800 BTU/h48% of its 47°F output
      Very good · beats 88%

      A good fit if…

      • You want a choice of indoor units - 188 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • 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.
      • Comfort and noise matter - a single-stage compressor runs only full-on or off.

      Calculate my running cost

      Details

      Specifications3.5 ton, R-454B
      General
      BrandTrane
      Outdoor unit model5TWX6042A1
      Series16 Single-Stage Heat Pump with WeatherGuard Top
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerSingle stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 16, 2026
      Last certifiedSeptember 16, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity38,500-41,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.1
      Capacity at 47°F38,500-40,500 BTU/h
      Capacity at 17°F25,000-26,000 BTU/h
      Capacity at 5°F18,700-19,800 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.11-2.30
      ENERGY STAR cold climateNo
      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 5TXCC009AS3+TSTAT at the standard test temperatures, in BTU/h:

      Certified matchups188 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 188 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      5TXCC009AS3+TSTATL8V1C100U5VSB16.012.08.119,000218110810
      5TXCC009AS3+TSTAT*UHMC100CCV416.012.08.119,100218110809
      5TXCC009AS3+TSTAT+P0V0C000M50SD-16.012.08.119,000218110808
      5TXCC009AS3+TSTATS8X2C080M5PSC16.012.08.119,200218110806
      5TXCC009AS3+TSTATS9V2C080U5VSB16.012.08.119,100218110805
      5TXCC009AS3+TSTATS9V2C100U4VSB16.012.08.119,000218110804
      5TXCC009AS3+TSTATS9V2C100U5VSB16.012.08.119,000218110803
      5TXCC009AS3+TSTATS9X1C080U5PSB16.012.08.119,100218110802
      5TXCC009AS3+TSTATS9X2C080U5PSB16.012.08.119,100218110800
      5TXCC009AS3+TSTATS8V2C100M5PCB16.012.08.119,200218110799
      5TXCC009AS3+TSTATS8V2C100M5PDB16.012.08.119,200218110798
      5TXCC009AS3+TSTATS8X1C080M5PSC16.012.08.119,200218110797
      5TXCC009AS3+TSTATS8X1C080M5PTC16.012.08.119,200218110796
      5TXCC009AS3+TSTATS8X1C100M5PSC16.012.08.119,300218110795
      5TXCC009AS3+TSTATS8X1C100M5PTC16.012.08.119,300218110794
      5TEMCD07AV51+TDR+TSTAT-16.012.08.118,700218110743
      5TEMCD06AV41+TDR+TSTAT-16.012.08.118,900218110742
      5TEM6D07AV51+TDR+TSTAT-16.012.08.118,800218110741
      5TEM6D06AV41+TDR+TSTAT-16.012.08.118,800218110740
      5TAM5D07AC51+TSTAT-16.012.08.119,200218110731
      5TAM5D06AC41+TSTAT-16.012.08.119,000218110730
      5PX*DD10AS3+TSTAT+P0V0D000M50SD-16.012.08.118,900218110726
      5PX*D010AS3+TSTATS8X2D120M5PSC16.012.08.119,100218110722
      5PX*D010AS3+TSTATS9X2D120U5PSB16.012.08.119,200218110721
      5PX*D010AS3+TSTAT*UHMD120CCV516.012.08.119,000218110720
      5PX*D010AS3+TSTATS8X1D120M5PSC16.012.08.119,100218110719
      5PX*D010AS3+TSTATS8V2D120M5PDB16.012.08.119,100218110718
      5PX*D010AS3+TSTAT+P0V0D000M50SD-16.012.08.118,900218110717
      5PX*D010AS3+TSTATS9V2D120U5VSB16.012.08.119,100218110716
      5PX*D010AS3+TSTATS8X2D120M5PTC16.012.08.119,100218110715
      5PX*D010AS3+TSTATS9X1D120U5PSB16.012.08.119,200218110714
      5PX*D008AS3+TSTATS8X1D120M5PTC16.012.08.119,200218110709
      5PX*D008AS3+TSTATS8X2D120M5PSC16.012.08.119,200218110708
      5PX*D008AS3+TSTATS8X2D120M5PTC16.012.08.119,200218110707
      5PX*D008AS3+TSTATS8X1D120M5PSC16.012.08.119,200218110706
      5PX*D008AS3+TSTATS9X2D120U5PSB16.012.08.119,300218110705
      5PX*D008AS3+TSTATS8V2D120M5PCB16.012.08.119,300218110704
      5PX*D008AS3+TSTATS8V2D120M5PDB16.012.08.119,300218110703
      5PX*D008AS3+TSTATS9X1D120U5PSB16.012.08.119,300218110702
      5PX*C009AS3+TSTATS8X2C080M5PSC16.012.08.119,200218110673
      5PX*C009AS3+TSTATS8X1C080M5PTC16.012.08.119,200218110672
      5PX*C009AS3+TSTATS8X1C100M5PSC16.012.08.119,300218110671
      5PX*C009AS3+TSTATS8X1C100M5PTC16.012.08.119,300218110670
      5PX*C009AS3+TSTATS8X2C080M5PTC16.012.08.119,200218110668
      5PX*C009AS3+TSTATS8X2C100M5PSC16.012.08.119,300218110667
      5PX*C009AS3+TSTATS8X2C100M5PTC16.012.08.119,300218110666
      5PX*C009AS3+TSTATS9V2C080U5VSB16.012.08.119,100218110665
      5PX*C009AS3+TSTATL8V1C100U5VSB16.012.08.119,000218110664
      5PX*C009AS3+TSTAT+P0V0C000M50SD-16.012.08.119,000218110663
      5PX*C009AS3+TSTATS8V2C100M5PCB16.012.08.119,200218110662
      5PX*C009AS3+TSTATS8V2C100M5PDB16.012.08.119,200218110661
      5PX*C009AS3+TSTATS8X1C080M5PSC16.012.08.119,200218110660
      5PX*C009AS3+TSTATS9X1C080U5PSB16.012.08.119,100218110659
      5PX*C009AS3+TSTATS9X2C080U5PSB16.012.08.119,100218110657
      5PX*C007AS3+TSTATS8X2C100M5PSC16.012.08.119,400218110656
      5PX*C007AS3+TSTATS8X1C100M5PTC16.012.08.119,400218110655
      5PX*C007AS3+TSTATS8X1C100M5PSC16.012.08.119,400218110646
      5TXCD010AS3+TSTATS8X1D120M5PSC16.012.08.119,100218110825
      5TXCD010AS3+TSTATS8X1D120M5PTC16.012.08.119,100218110824
      5TXCD010AS3+TSTATS8X2D120M5PSC16.012.08.119,100218110823
      Yearly running cost in 10 large cities$1,174-$3,092

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

      Questions5
      What is the SEER2 rating of the Trane 5TWX6042A1?
      The Trane 5TWX6042A1 is rated at up to 16.0 SEER2 and 12.0 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 188 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Trane 5TWX6042A1 good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 3.5-ton model.
      How much does the Trane 5TWX6042A1 cost to run per year?
      At its rated efficiency it costs about $1,174-$3,092 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,441 in Phoenix and $2,578 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 Trane 5TWX6042A1?
      ENERGY STAR lists 188 certified combinations for this outdoor unit. The highest-rated ones use 5TXCC009AS3+TSTAT, 5TXCC009AS3+TSTAT+P0V0C000M50SD, 5TEMCD07AV51+TDR+TSTAT.
      What refrigerant does the Trane 5TWX6042A1 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 $1,426/yrYou save $628/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 Trane 5TWX6042A1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,426
      Current system, per year
      $2,054
      You save per year
      $628
      Payback
      23.9 years
      Net after 10 years
      -$8,719

      Cooling $880Heating $546Electricity used: 8,914 kWhSaved vs. a minimum-efficiency heat pump: $148

      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 September 16, 2026. How we use the data.