HVAC Rated
    Menu

      3.5-ton central heat pump · 15 Single-Stage Heat Pump with WeatherGuard Top

      Trane 5TWX5042A1

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

      Ranks #55 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,245 a year to run in a mixed climate like Atlanta.

      SEER2
      16.5 Cooling efficiency over a season
      Average · beats 40%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Average · beats 64%
      Heat at 5°F
      20,000 BTU/h49% of its 47°F output
      Very good · beats 88%

      A good fit if…

      • You want a choice of indoor units - 231 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.
      • 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 model5TWX5042A1
      Series15 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 1, 2024
      Last certifiedJune 16, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.5 (range 15.2-16.5)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity38,000-41,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F38,500-40,000 BTU/h
      Capacity at 17°F25,000-26,200 BTU/h
      Capacity at 5°F18,700-20,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.30
      ENERGY STAR cold climateNo
      Heating output as it gets colder49% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 5TXCD008AS3+TSTAT+P0V0D000M50SD at the standard test temperatures, in BTU/h:

      Certified matchups231 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 231 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      5TXCD008AS3+TSTAT+P0V0D000M50SD-16.512.08.119,200215687470
      5PX*D008AS3+TSTAT+P0V0D000M50SD-16.512.08.119,200215687375
      5PX*D010AS3+TSTATS9V2D120U5PSC16.512.08.119,400215687386
      5PX*D010AS3+TSTAT+P0V0D000M50SD-16.512.08.119,100215687387
      5PX*D010AS3+TSTATS9V2D120U5VSB16.512.08.119,400215687392
      5TEMCD06AV41+TDR+TSTAT-16.512.08.118,700215863981
      5TEMCD07AV51+TDR+TSTAT-16.512.08.118,700215863982
      5TXCD010AS3+TSTAT+P0V0D000M50SD-16.512.08.018,800214182925
      5TEM6D07AV51+TDR+TSTAT-16.012.08.519,700214182698
      5TXCD010AS3+TSTATS8V2D120M5PCA16.012.08.119,100214182923
      5TXCD010AS3+TSTAT*UHMD120ACV516.012.08.119,000214182931
      5TXCD010AS3+TSTATS9V2D120U5VSB16.012.08.118,900214182935
      5TXCD010AS3+TSTATS9V2D120U5VSA16.012.08.118,900214182937
      5TXCD010AS3+TSTATS9V2D120U5PSC16.012.08.119,000214182939
      5TXCD010AS3+TSTATS9V2D120U5PSB16.012.08.118,900214182941
      5TXCD010AS3+TSTATS8X2D120M5PTC16.012.08.119,100214182943
      5TXCD010AS3+TSTATS8X1D120M5PSC16.012.08.119,100214182949
      5TXCD010AS3+TSTATS8V2D120M5PDA16.012.08.119,100214182947
      5TXCD010AS3+TSTATS8X2D120M5PSC16.012.08.119,100214182953
      5TXCD010AS3+TSTATS8X1D120M5PTC16.012.08.119,100214182955
      5TEM6D06AV41+TDR+TSTAT-16.012.08.119,300214182696
      5TXCC009AS3+TSTATS9X2C080U5PSB16.012.08.119,600215687449
      5TXCC009AS3+TSTATS8X2C100M5PSC16.012.08.119,300215687451
      5TXCC009AS3+TSTATS8X2C080M5PSC16.012.08.119,200215687452
      5TXCC009AS3+TSTAT*UHMC100CCV416.012.08.119,100215687454
      5TXCC009AS3+TSTATL8V1C100U5VSB16.012.08.119,500215687453
      5TXCC009AS3+TSTATS9X1C080U5PSB16.012.08.119,600215687455
      5TXCC009AS3+TSTATS8X2C100M5PTC16.012.08.119,300215687456
      5TXCC009AS3+TSTATS9V2C080U5PSC16.012.08.119,300215687457
      5TXCC009AS3+TSTATS9V2C100U4VSB16.012.08.119,200215687458
      5TXCC009AS3+TSTATS9V2C100U5PSC16.012.08.119,200215687459
      5TXCD008AS3+TSTATS9V2D120U5PSC16.012.08.119,200215687464
      5TXCD008AS3+TSTATS8X2D120M5PTC16.012.08.119,400215687465
      5TXCD008AS3+TSTATS8X2D120M5PSC16.012.08.119,400215687466
      5TXCD008AS3+TSTATS8X1D120M5PTC16.012.08.119,400215687467
      5TXCD008AS3+TSTATS8X1D120M5PSC16.012.08.119,400215687468
      5TXCD008AS3+TSTATS8V2D120M5PCB16.012.08.119,400215687469
      5TXCD008AS3+TSTAT*UHMD120CCV516.012.08.119,500215687472
      5TXCD008AS3+TSTATS9X2D120U5PSB16.012.08.119,300215687473
      5TXCD008AS3+TSTATS9V2D120U5VSB16.012.08.119,200215687474
      5TXCD008AS3+TSTATS9X1D120U5PSB16.012.08.119,300215687475
      5TXCC009AS3+TSTATS8X2C080M5PTC16.012.08.119,200215687436
      5TXCC009AS3+TSTATS8X1C100M5PTC16.012.08.119,300215687438
      5TXCC009AS3+TSTATS8X1C100M5PSC16.012.08.119,300215687439
      5TXCC009AS3+TSTATS8X1C080M5PTC16.012.08.119,200215687440
      5TXCC009AS3+TSTATS8V2C100M5PDB16.012.08.119,300215687442
      5TXCC009AS3+TSTATS8V2C100M5PCB16.012.08.119,300215687443
      5TXCC009AS3+TSTATS8X1C080M5PSC16.012.08.119,200215687441
      5TXCC009AS3+TSTATS8V2C080M5PDB16.012.08.119,300215687444
      5TXCC009AS3+TSTATS8V2C080M5PCB16.012.08.119,300215687445
      5TXCC009AS3+TSTAT+P0V0C000M50SD-16.012.08.119,000215687446
      5PX*C007AS3+TSTATS8X2C100M5PSC16.012.08.119,700215687282
      5PX*C007AS3+TSTATS9V2C100U5PSC16.012.08.119,700215687283
      5PX*C007AS3+TSTATS8X2C080M5PSC16.012.08.119,700215687284
      5PX*C007AS3+TSTATS8X1C100M5PTC16.012.08.119,700215687285
      5PX*C007AS3+TSTATS8X1C080M5PTC16.012.08.119,700215687287
      5PX*C007AS3+TSTATS8X1C100M5PSC16.012.08.119,700215687286
      5PX*C007AS3+TSTATS8X1C080M5PSC16.012.08.119,700215687288
      5PX*C007AS3+TSTAT+P0V0C000M50SD-16.012.08.119,200215687293
      5PX*C007AS3+TSTATL8V1C100U5VSB16.012.08.119,600215687296
      Yearly running cost in 10 large cities$1,138-$2,957

      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 5TWX5042A1?
      The Trane 5TWX5042A1 is rated at up to 16.5 SEER2 and 12.0 EER2 for cooling and up to 8.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 231 certified matchups SEER2 ranges from 15.2-16.5.
      Is the Trane 5TWX5042A1 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 5TWX5042A1 cost to run per year?
      At its rated efficiency it costs about $1,138-$2,957 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,391 in Phoenix and $2,461 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 5TWX5042A1?
      ENERGY STAR lists 231 certified combinations for this outdoor unit. The highest-rated ones use 5TXCD008AS3+TSTAT+P0V0D000M50SD, 5PX*D008AS3+TSTAT+P0V0D000M50SD, 5PX*D010AS3+TSTAT.
      What refrigerant does the Trane 5TWX5042A1 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 $1,374/yrYou save $681/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 5TWX5042A1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,374
      Current system, per year
      $2,054
      You save per year
      $681
      Payback
      22.0 years
      Net after 10 years
      -$8,195

      Cooling $853Heating $520Electricity used: 8,586 kWhSaved vs. a minimum-efficiency heat pump: $201

      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 June 16, 2026. How we use the data.