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      2-ton central heat pump · MAINLINE 16 SEER2 HP

      Heil B5H6S24*K*AAA

      Average cooling efficiency and below average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

      Ranks #259 of 331 2 ton central heat pumps for cooling efficiency, and costs about $723 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
      13.0 Cooling efficiency on a 95°F day
      Very good · beats 89%
      Heat at 5°F
      11,900 BTU/h49% of its 47°F output
      Very good · beats 83%

      A good fit if…

      • You want a choice of indoor units - 1,456 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

      Specifications2 ton, R-454B
      General
      BrandHeil
      Also sold asKeeprite, Day & Night, Comfortmaker, Kenmore, Arcoaire, Airquest, Tempstar
      Outdoor unit modelB5H6S24*K*AAA
      SeriesMAINLINE 16 SEER2 HP
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerSingle stage
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJanuary 1, 2024
      Last certifiedJuly 16, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.5 (range 15.2-16.5)
      EER2Efficiency at 95°F outdoors11.7-13.0
      Cooling capacity22,200-24,400 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better7.8-8.5
      Capacity at 47°F21,600-24,000 BTU/h
      Capacity at 17°F14,200-15,200 BTU/h
      Capacity at 5°F10,800-11,900 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.98-2.26
      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 FMA5X30**AL at the standard test temperatures, in BTU/h:

      Certified matchups1,456 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 1,456 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      FMA5X30**AL-16.513.08.511,600218188177
      FMA5X30**AL-16.513.08.511,600218196932
      FMA5X30**AL-16.513.08.511,600218200287
      FMA5X30**AL-16.513.08.511,600218200284
      FMA5X30**AL-16.513.08.511,600218201974
      FMA5X30**AL-16.513.08.511,600218201973
      FMA5X30**AL-16.513.08.511,600218201967
      FMA5X30**AL-16.513.08.511,600218203596
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218188218
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218188217
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218196973
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218196972
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218200405
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218200404
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218200403
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218200402
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218202324
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218202323
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218202322
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218202321
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218202320
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218202319
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400218203637
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500218203636
      EA*5X37M21A*+WALLCON*96CTN1002122B*16.012.57.811,500218188297
      EA*5X37M21A*+WALLCON*97CMN1002122B*16.012.57.811,500218188296
      EA*5X37M21A*+WALLCON*97CMN0802120B*16.012.57.811,500218188295
      EA*5X37M21A*+WALLCON*95CSU1002122B*16.012.57.811,600218188294
      EA*5X37M21A*+WALLCON*80CTL0902120B*16.012.57.811,500218188292
      EA*5X25M17A*+WALLCON*80CTL0701412B*16.012.57.811,400218188290
      FM(C,U)5Z36**AL-16.012.57.811,100218188287
      FM(C,U)5Z30**AL-16.012.57.811,100218188286
      EA*5X37M21A*+WALLCON*96CTN0802120B*16.012.57.811,500218188209
      EVD5X38M17A*92MSN0601714A*16.012.07.811,400218187935
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400218187932
      EVD5X38M17A*80MSU0601716A*16.012.57.811,300218187928
      EVD5X38M17A*80VSL0901716B*16.012.57.811,400218187926
      EVD5X38M17A*80VSL0701716B*16.012.07.811,300218187925
      EVD5X38M17A*80MS(N,L)0901714A*16.012.57.811,200218187922
      EVD5X38M17A*80MS(N,L)0701716A*16.012.07.811,400218187921
      EVD5X38M17A*80MS(N,L)0701712A*16.012.57.811,400218187920
      EVD5X37M21A*80MS(N,L)0902116A*16.012.07.811,200218187907
      EVD5X31M17A*80MSU0601716A*16.012.57.811,200218187903
      EVM5X32M17A*92MSN0801716A*16.012.07.811,200218187896
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300218187889
      EVM5X32M17A*80VSL0901716B*16.012.07.811,400218187887
      EVM5X32M17A*80MS(N,L)0901714A*16.012.07.811,200218187883
      EVM5X31M17A*80MSU0601716A*16.012.07.811,200218187879
      EA*5X37M21A*96CTN1002122B*16.012.57.811,500218187872
      EA*5X37M21A*96CTN0802120B*16.012.57.811,500218187871
      EA*5X37M21A*95MSU1002120A*16.012.07.811,500218187869
      EA*5X37M21A*97CMN1002122B*16.012.57.811,500218187862
      EA*5X37M21A*97CMN0802120B*16.012.57.811,500218187861
      EA*5X37M21A*95CSU1002122B*16.012.57.811,600218187860
      EA*5X37M21A*80VTL1102122B*16.012.07.811,500218187859
      EA*5X37M21A*80CTL0902120B*16.012.57.811,500218187858
      EA*5X25M17A*80CTL0701412B*16.012.57.811,400218187844
      EA*5X25M17A*80MSU0601716A*16.012.07.811,200218187843
      EA*5X25M17A*80MSU0401712A*16.012.57.811,300218187842
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300218187758
      Yearly running cost in 10 large cities$676-$1,705

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

      Questions5
      What is the SEER2 rating of the Heil B5H6S24*K*AAA?
      The Heil B5H6S24*K*AAA is rated at up to 16.5 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 1456 certified matchups SEER2 ranges from 15.2-16.5.
      Is the Heil B5H6S24*K*AAA 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 2-ton model.
      How much does the Heil B5H6S24*K*AAA cost to run per year?
      At its rated efficiency it costs about $676-$1,705 a year in electricity in large U.S. cities, depending on climate and local rates - for example $819 in Phoenix and $1,413 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 Heil B5H6S24*K*AAA?
      ENERGY STAR lists 1456 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, EA*5X37M21A, EA*5X37M21A*+WALLCON.
      What refrigerant does the Heil B5H6S24*K*AAA 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 $806/yrYou save $402/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 Heil B5H6S24*K*AAA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $806
      Current system, per year
      $1,208
      You save per year
      $402
      Payback
      22.4 years
      Net after 10 years
      -$4,980

      Cooling $508Heating $298Electricity used: 5,035 kWhSaved vs. a minimum-efficiency heat pump: $118

      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 2 ton models

      See all 331 2 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 16, 2026. How we use the data.