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      4-ton central heat pump · 2-STAGE 18 SEER HP

      WeatherMaker PH8TAN548**AB

      Average cooling efficiency and below average heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

      Ranks #112 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,498 a year to run in a mixed climate like Atlanta.

      SEER2
      18.0 Cooling efficiency over a season
      Average · beats 66%
      HSPF2
      8.5 Heating efficiency over a season
      Below average · beats 38%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Very good · beats 89%
      Heat at 5°F
      26,600 BTU/h50% of its 47°F output
      Excellent · beats 90%

      A good fit if…

      • You want a choice of indoor units - 150 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.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandWeatherMaker
      Outdoor unit modelPH8TAN548**AB
      Series2-STAGE 18 SEER HP
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerTwo-stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 4, 2024
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.0 (range 15.2-18.0)
      EER2Efficiency at 95°F outdoors11.7-13.5
      Cooling capacity46,000-50,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F48,500-52,500 BTU/h
      Capacity at 17°F30,000-32,400 BTU/h
      Capacity at 5°F23,800-26,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10-2.32
      ENERGY STAR cold climateNo
      Heating output as it gets colder50% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with QFVA5D6021X at the standard test temperatures, in BTU/h:

      Certified matchups150 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 150 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      QFVA5D6021X-18.013.08.525,800218755724
      PF5TNBD60L-18.013.58.124,600218754767
      CVAVA6124XMAPG80VTLB66135D**17.512.58.525,000218755070
      CVAVA6124XMAPG80VTLB66110C**17.512.58.524,800218755069
      CVAVA6121XMAPG80MSUA60100C**17.512.58.525,000218755060
      CVAVA6121XMAPG80MSUA60080C**17.513.08.524,400218755059
      CVAVA6121XMAPG80VTLB66110C**17.512.58.124,600218755062
      CVAVA6121XMAPG80MSUA48060B**17.512.08.125,000218755058
      CVAVA4924XMAPG80MSUA60080C**17.512.58.124,600218755044
      CVAMA6021XMAPG80MSUA60080C**17.512.58.124,400218755028
      CVAMA4921XMAPG80MSUA60080C**17.512.58.124,400218755019
      QFVA5D4821X-17.512.58.125,400218755723
      CVAVA6124XMAPG96VTAB60080C**17.012.08.525,600218755073
      CVAVA6124XMAPG80VTLB60090C**17.012.58.525,000218755068
      CVAVA6124XMAPG80MSUA60100C**17.012.58.525,000218755067
      CVAVA6121XMAPG95MSUA60100C**17.012.58.524,800218755064
      CVAVA6121XMAPG80VTLB60090C**17.012.58.524,800218755061
      PF5TNXC48L-17.012.58.124,600218755134
      CVAVA6021XMAPG80VTLB60090C**17.012.58.124,600218755132
      CVAVA6124XMAPG96VTAB60100C**17.012.08.125,200218755074
      CVAVA6124XMAPG95MSUA60100C**17.012.08.125,200218755072
      CVAVA6121XMAPG96VTAB60100C**17.012.08.125,000218755066
      CVAVA6121XMAPG96VTAB60080C**17.012.08.125,000218755065
      CVAVA6021XMAPG95MSUA60100C**17.012.08.124,800218755055
      CVAVA6021XMAPG80VTLB66110C**17.012.58.124,400218755053
      CVAVA6021XMAPG80MSUA60100C**17.012.08.124,800218755052
      CVAVA6021XMAPG80MSUA48060B**17.012.08.125,000218755051
      CVAVA4924XMAPG80VTLB66135D**17.012.58.124,800218755047
      CVAVA4924XMAPG80VTLB60090C**17.012.08.125,000218755045
      CVAVA4821XMAPG80MSUA60080C**17.012.08.124,000218755037
      CVAMA6021XMAPG95MSUA60100C**17.012.08.124,800218755033
      CVAMA6021XMAPG80VTLB66110C**17.012.58.124,400218755031
      CVAMA6021XMAPG80VTLB60090C**17.012.08.124,600218755030
      CVAMA6021XMAPG80MSUA60100C**17.012.08.124,800218755029
      CVAMA6021XMAPG80MSUA48060B**17.012.08.125,000218755027
      CVAMA4921XMAPG95MSUA60100C**17.012.08.125,200218755024
      CVAMA4921XMAPG80VTLB66110C**17.012.58.124,800218755022
      CVAMA4921XMAPG80VTLB60090C**17.012.08.125,000218755021
      CVAMA4921XMAPG80MSUA60100C**17.012.08.124,800218755020
      CVAMA4921XMAPG80MSUA48060B**17.012.08.125,000218755018
      CVAMA4821XMAPG80MSUA60080C**17.012.08.124,000218755010
      CVAVA6124XMAPG97VTAA60100C**17.012.08.025,200218755717
      CVAVA6124XMAPG97VTAA60080C**17.012.08.025,600218755716
      CVAVA6121XMAPG97VTAA60100C**17.012.08.025,000218755715
      CVAVA6121XMAPG97VTAA60080C**17.012.08.025,000218755714
      CAA**6124AMPG80MSUA60080C**16.512.08.125,600218755213
      CAA**6121AMPG80VTLB60090C**16.512.58.125,600218755206
      CAA**6121AMPG80MSUA60100C**16.512.08.125,800218755204
      CAA**6121AMPG80MSUA60080C**16.512.58.125,200218755203
      CAA**6121AMPG80MSUA48060B**16.512.08.125,400218755202
      CAA**6024AMPG80MSUA60080C**16.512.08.125,600218755192
      CVAVA6124XMAPG96VTAB66120D**16.512.08.125,200218755075
      CVAVA6124XMAPG95MSUA60080C**16.512.08.125,200218755071
      CVAVA6121XMAPG95MSUA60080C**16.512.08.125,200218755063
      CVAVA6021XMAPG96VTAB60100C**16.512.08.124,600218755057
      CVAVA6021XMAPG96VTAB60080C**16.512.08.124,800218755056
      CVAVA6021XMAPG95MSUA60080C**16.512.08.125,000218755054
      CVAVA4924XMAPG96VTAB60100C**16.511.78.125,400218755050
      CVAVA4924XMAPG96VTAB60080C**16.511.78.125,400218755049
      CVAVA4924XMAPG95MSUA60100C**16.512.08.125,000218755048
      Yearly running cost in 10 large cities$1,258-$3,646

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

      Questions5
      What is the SEER2 rating of the WeatherMaker PH8TAN548**AB?
      The WeatherMaker PH8TAN548**AB is rated at up to 18.0 SEER2 and 13.0 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 150 certified matchups SEER2 ranges from 15.2-18.0.
      Is the WeatherMaker PH8TAN548**AB 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 4-ton model.
      How much does the WeatherMaker PH8TAN548**AB cost to run per year?
      At its rated efficiency it costs about $1,258-$3,646 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,589 in Phoenix and $3,076 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 WeatherMaker PH8TAN548**AB?
      ENERGY STAR lists 150 certified combinations for this outdoor unit. The highest-rated ones use QFVA5D6021X, PF5TNBD60L, CVAVA6124XMA.
      What refrigerant does the WeatherMaker PH8TAN548**AB 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 $1,597/yrYou save $910/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 WeatherMaker PH8TAN548**AB
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,597
      Current system, per year
      $2,508
      You save per year
      $910
      Payback
      19.8 years
      Net after 10 years
      -$8,898

      Cooling $939Heating $659Electricity used: 9,984 kWhSaved vs. a minimum-efficiency heat pump: $331

      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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      See all 319 4 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 22, 2026. How we use the data.