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      2-ton central heat pump · D5F Series

      Day & Night D5CURAH24AAK

      Very good cooling efficiency and excellent heating efficiency for a 2-ton central heat pump, and certified for cold climates.

      Ranks #129 of 331 2 ton central heat pumps for cooling efficiency, and costs about $657 a year to run in a mixed climate like Atlanta.

      SEER2
      18.2 Cooling efficiency over a season
      Very good · beats 73%
      HSPF2
      10.4 Heating efficiency over a season
      Excellent · beats 94%
      EER2
      11.0 Cooling efficiency on a 95°F day
      Below average · beats 23%
      Heat at 5°F
      21,600 BTU/h83% of its 47°F output
      Below average · beats 31%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 73% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 21,600 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 94% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications2 ton, R-454B
      General
      BrandDay & Night
      Also sold asHeil, Arcoaire, Comfortmaker, Tempstar, Smart Comfort, Airquest, Keeprite, Midea, Viessmann, Kenmore, LPS Legacy, Grandaire, Carrier, Bryant, Payne, WeatherMaker
      Outdoor unit modelD5CURAH24AAK
      SeriesD5F Series
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 15, 2018
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.2 (range 15.5-18.2)
      EER2Efficiency at 95°F outdoors10.0-11.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.0-10.4
      Capacity at 47°F24,000-26,000 BTU/h
      Capacity at 17°F19,000-20,800 BTU/h
      Capacity at 5°F19,000-21,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.98
      ENERGY STAR cold climateYes
      Heating output as it gets colder83% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with D5FUAAH24XAK at the standard test temperatures, in BTU/h:

      Certified matchups84 indoor units

      The same outdoor unit scores differently with each indoor unit. The 60 highest-rated of 84 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      D5FUAAH24XAK · cold climate18.211.09.721,600215318952
      D5FUAAH24XAK · cold climate18.211.09.721,600215318980
      D5FUAAH24XAK · cold climate18.211.09.721,600215319064
      D5FUAAH24XAK · cold climate18.211.09.721,600215318896
      D5FUAAH24XAK · cold climate18.211.09.721,600215318924
      D5FUAAH24XAK · cold climate18.211.09.721,600215319036
      D5FUAAH24XAK · cold climate18.211.09.721,600215319092
      D5FUAAH24XAK · cold climate18.211.09.721,600215319120
      D5FUAAH24XAK · cold climate18.211.09.721,600215319148
      D5FUAAH24XAK · cold climate18.211.09.721,600215319176
      D5FUAAH24XAK · cold climate18.211.09.721,600215319204
      D5FUAAH24XAK · cold climate18.211.09.721,600215319008
      D5FUAAH24XAK · cold climate18.211.09.721,600217178776
      D5MUWAQ24XA3 · cold climate17.410.810.419,600217730624
      D5MUWAQ24XA3 · cold climate17.410.810.419,600217730640
      D5MUWAQ24XA3 · cold climate17.410.810.419,600217730656
      D5MUWAQ24XA3 · cold climate17.410.810.419,600217730672
      D5MUWAQ24XA3 · cold climate17.410.810.419,600217730688
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213800
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213794
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213788
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213782
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213776
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213770
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213764
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213758
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213752
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213746
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218213740
      D5MUWAQ24XA3 · cold climate17.410.810.419,600218668526
      D5FULAH24XBX · cold climate16.010.09.019,000217456621
      D5FULAH24XAX · cold climate16.010.09.019,000217456592
      D5FULAH24XAX · cold climate16.010.09.019,000217456704
      D5FULAH24XBX · cold climate16.010.09.019,000217456705
      D5FULAH24XBX · cold climate16.010.09.019,000217456509
      D5FULAH24XBX · cold climate16.010.09.019,000217456649
      D5FULAH24XAX · cold climate16.010.09.019,000217456732
      D5FULAH24XBX · cold climate16.010.09.019,000217456733
      D5FULAH24XBX · cold climate16.010.09.019,000217456537
      D5FULAH24XAX · cold climate16.010.09.019,000217456536
      D5FULAH24XBX · cold climate16.010.09.019,000217456565
      D5FULAH24XAX · cold climate16.010.09.019,000217456452
      D5FULAH24XBX · cold climate16.010.09.019,000217456453
      D5FULAH24XAX · cold climate16.010.09.019,000217456676
      D5FULAH24XBX · cold climate16.010.09.019,000217456677
      D5FULAH24XAX · cold climate16.010.09.019,000217456760
      D5FULAH24XBX · cold climate16.010.09.019,000217456761
      D5FULAH24XAX · cold climate16.010.09.019,000217456620
      D5FULAH24XAX · cold climate16.010.09.019,000217456480
      D5FULAH24XBX · cold climate16.010.09.019,000217456481
      D5FULAH24XBX · cold climate16.010.09.019,000217456593
      D5FULAH24XAX · cold climate16.010.09.019,000217456648
      D5FULAH24XAX · cold climate16.010.09.019,000217456786
      D5FULAH24XBX · cold climate16.010.09.019,000217456787
      D5FULAH24XAX · cold climate16.010.09.019,000217456508
      D5FULAH24XAX · cold climate16.010.09.019,000217456564
      D5FULBH24XAX · cold climate16.010.09.019,000218792515
      D5FULBH24XBX · cold climate16.010.09.019,000218792514
      D5FULBH24XAX · cold climate16.010.09.019,000218792501
      D5FULBH24XBX · cold climate16.010.09.019,000218792500
      Yearly running cost in 10 large cities$618-$1,545

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

      Questions5
      What is the SEER2 rating of the Day & Night D5CURAH24AAK?
      The Day & Night D5CURAH24AAK is rated at up to 18.2 SEER2 and 11.0 EER2 for cooling and up to 10.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 84 certified matchups SEER2 ranges from 15.5-18.2.
      Is the Day & Night D5CURAH24AAK good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 21,600 BTU/h at 5°F with a COP of 1.98, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Day & Night D5CURAH24AAK cost to run per year?
      At its rated efficiency it costs about $618-$1,545 a year in electricity in large U.S. cities, depending on climate and local rates - for example $747 in Phoenix and $1,279 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 Day & Night D5CURAH24AAK?
      ENERGY STAR lists 84 certified combinations for this outdoor unit. The highest-rated ones use D5FUAAH24XAK, D5MUWAQ24XA3, D5FULAH24XBX.
      What refrigerant does the Day & Night D5CURAH24AAK 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 $733/yrYou save $520/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 Day & Night D5CURAH24AAK
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $733
      Current system, per year
      $1,254
      You save per year
      $520
      Payback
      17.3 years
      Net after 10 years
      -$3,795

      Cooling $464Heating $269Electricity used: 4,584 kWhSaved vs. a minimum-efficiency heat pump: $231

      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 September 22, 2026. How we use the data.