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

      Trane 5TWX6018A1

      Below average cooling and heating efficiency for a 1.5-ton central heat pump, but not rated for cold climates.

      Ranks #123 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $605 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
      9,000 BTU/h49% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want a certified 1.5-ton central heat pump at a typical efficiency level.

      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

      Specifications1.5 ton, R-454B
      General
      BrandTrane
      Outdoor unit model5TWX6018A1
      Series16 Single-Stage Heat Pump with WeatherGuard Top
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerSingle stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 16, 2026
      Last certifiedMarch 26, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.0 (range 15.2-16.0)
      EER2Efficiency at 95°F outdoors11.7-12.0
      Cooling capacity18,000-19,200 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.0-8.1
      Capacity at 47°F17,400-18,600 BTU/h
      Capacity at 17°F11,400-11,900 BTU/h
      Capacity at 5°F8,700-9,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.07-2.10
      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 5TEMCB03AV31+TDR+TSTAT at the standard test temperatures, in BTU/h:

      Certified matchups6 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.
      5TEMCB03AV31+TDR+TSTAT-16.012.08.18,900218109624
      5TEM6B03AV21+TDR+TSTAT-15.212.08.19,000218109622
      5TXCB006AS3+TSTATS9V2B060D3VSB15.212.08.18,700218112286
      5TXCB006AS3+TSTATS9V2B040D3VSB15.212.08.18,800218112285
      5PX*B006AS3+TSTATS9V2B060D3VSB15.211.78.18,700218112226
      5TEMCB02AV21+TDR+TSTAT-15.212.08.08,900218109623
      Yearly running cost in 10 large cities$552-$1,437

      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 5TWX6018A1?
      The Trane 5TWX6018A1 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 6 certified matchups SEER2 ranges from 15.2-16.0.
      Is the Trane 5TWX6018A1 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 1.5-ton model.
      How much does the Trane 5TWX6018A1 cost to run per year?
      At its rated efficiency it costs about $552-$1,437 a year in electricity in large U.S. cities, depending on climate and local rates - for example $675 in Phoenix and $1,196 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 5TWX6018A1?
      ENERGY STAR lists 6 certified combinations for this outdoor unit. The highest-rated ones use 5TEMCB03AV31+TDR+TSTAT, 5TEM6B03AV21+TDR+TSTAT, 5TXCB006AS3+TSTAT.
      What refrigerant does the Trane 5TWX6018A1 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 $667/yrYou save $295/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 5TWX6018A1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $667
      Current system, per year
      $961
      You save per year
      $295
      Payback
      23.8 years
      Net after 10 years
      -$4,054

      Cooling $414Heating $253Electricity used: 4,166 kWhSaved vs. a minimum-efficiency heat pump: $69

      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 March 26, 2026. How we use the data.