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      2-ton central heat pump · PERFORMANCE 16 SEER2 HP

      Tempstar N5H5S24*K*AAA

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

      Ranks #261 of 331 2 ton central heat pumps for cooling efficiency, and costs about $721 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 - 1,985 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
      BrandTempstar
      Also sold asKenmore, Arcoaire, Airquest, Comfortmaker, Day & Night, Keeprite, Heil, ACIQ, Smart Comfort, MARATHERM
      Outdoor unit modelN5H5S24*K*AAA
      SeriesPERFORMANCE 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 certifiedJune 29, 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 heater1.96-2.26
      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 matchups1,985 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 1,985 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      FMA5X30**AL-16.513.08.511,600214424077
      FMA5X30**AL-16.513.08.511,600214424079
      FMA5X30**AL-16.513.08.511,600214424081
      FMA5X30**AL-16.513.08.511,600214424083
      FMA5X30**AL-16.513.08.511,600214424085
      FMA5X30**AL-16.513.08.511,600214424087
      FMA5X30**AL-16.513.08.511,600214424089
      FMA5X30**AL-16.513.08.511,600214424091
      FMA5X30**AL-16.513.08.511,600214424093
      FMA5X30**AL-16.513.08.511,600214424095
      FMA5X30**AL-16.513.08.511,600216630615
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800257
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800259
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800261
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800263
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800265
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800267
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800269
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800271
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215800273
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800282
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800284
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800286
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800288
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800290
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800292
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800294
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800296
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215800298
      EA*5X37M21A*97VTN1002120A*16.012.58.011,500215818018
      EA*5X37M21A*97VTN1002122A*16.013.08.011,400215818020
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205062
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205064
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205066
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205068
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205070
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205072
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205074
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205076
      EVD5X31M17A*80VSL0901716B*16.012.07.811,300214205078
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212741
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212743
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212745
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212747
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212749
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212751
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212753
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212755
      EVM5X32M17A*80MSU0601716A*16.012.57.811,300214212757
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214361
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214363
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214365
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214367
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214369
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214371
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214373
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214375
      EVD5X38M17A*80VTL0701716B*16.012.07.811,400214214377
      EVD5X37M21A*80MS(N,L)0902116A*16.012.07.811,200214213398
      EVD5X37M21A*80MS(N,L)0902116A*16.012.07.811,200214213400
      Yearly running cost in 10 large cities$671-$1,702

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

      Questions5
      What is the SEER2 rating of the Tempstar N5H5S24*K*AAA?
      The Tempstar N5H5S24*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 1985 certified matchups SEER2 ranges from 15.2-16.5.
      Is the Tempstar N5H5S24*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 Tempstar N5H5S24*K*AAA cost to run per year?
      At its rated efficiency it costs about $671-$1,702 a year in electricity in large U.S. cities, depending on climate and local rates - for example $814 in Phoenix and $1,412 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 Tempstar N5H5S24*K*AAA?
      ENERGY STAR lists 1985 certified combinations for this outdoor unit. The highest-rated ones use FMA5X30**AL, EA*5X37M21A, EVD5X31M17A.
      What refrigerant does the Tempstar N5H5S24*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 $801/yrYou save $399/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 Tempstar N5H5S24*K*AAA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $801
      Current system, per year
      $1,201
      You save per year
      $399
      Payback
      22.5 years
      Net after 10 years
      -$5,007

      Cooling $503Heating $298Electricity used: 5,008 kWhSaved vs. a minimum-efficiency heat pump: $117

      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 331 2 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 29, 2026. How we use the data.