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      3-ton central heat pump · D5F Series

      Day & Night D5CURAH36AAK

      Average cooling and heating efficiency for a 3-ton central heat pump, and certified for cold climates.

      Ranks #183 of 302 3 ton central heat pumps for cooling efficiency, and costs about $1,082 a year to run in a mixed climate like Atlanta.

      SEER2
      16.7 Cooling efficiency over a season
      Average · beats 43%
      HSPF2
      9.3 Heating efficiency over a season
      Average · beats 62%
      EER2
      10.2 Cooling efficiency on a 95°F day
      Below average · beats 15%
      Heat at 5°F
      29,200 BTU/h79% of its 47°F output
      Below average · beats 39%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 29,200 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 30 certified pairings.

      Think twice if…

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

      Calculate my running cost

      Details

      Specifications3 ton, R-454B
      General
      BrandDay & Night
      Also sold asMidea, Arcoaire, Keeprite, Comfortmaker, Kenmore, Tempstar, Smart Comfort, Airquest, LPS Legacy, Grandaire, Heil, Viessmann, Carrier, Bryant, Payne, WeatherMaker
      Outdoor unit modelD5CURAH36AAK
      SeriesD5F Series
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 15, 2018
      Last certifiedJuly 14, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better16.7 (range 16.2-16.7)
      EER2Efficiency at 95°F outdoors10.0-10.2
      Cooling capacity36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.7-9.3
      Capacity at 47°F36,000-37,000 BTU/h
      Capacity at 17°F24,800-27,000 BTU/h
      Capacity at 5°F27,000-29,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.99-2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder79% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with D5MUWAQ36XA3 at the standard test temperatures, in BTU/h:

      Certified matchups30 indoor units

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

      Indoor unitSEER2EER2HSPF2Heat @5°FAHRI ref.
      D5MUWAQ36XA3 · cold climate16.710.29.329,200217730628
      D5MUWAQ36XA3 · cold climate16.710.29.329,200217730644
      D5MUWAQ36XA3 · cold climate16.710.29.329,200217730660
      D5MUWAQ36XA3 · cold climate16.710.29.329,200217730676
      D5MUWAQ36XA3 · cold climate16.710.29.329,200217730692
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213801
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213795
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213789
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213783
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213777
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213771
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213765
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213759
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213753
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213747
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218213741
      D5MUWAQ36XA3 · cold climate16.710.29.329,200218668528
      D5FUAAH36XAK · cold climate16.210.08.727,000215318954
      D5FUAAH36XAK · cold climate16.210.08.727,000215319066
      D5FUAAH36XAK · cold climate16.210.08.727,000215318898
      D5FUAAH36XAK · cold climate16.210.08.727,000215319010
      D5FUAAH36XAK · cold climate16.210.08.727,000215318926
      D5FUAAH36XAK · cold climate16.210.08.727,000215319038
      D5FUAAH36XAK · cold climate16.210.08.727,000215319094
      D5FUAAH36XAK · cold climate16.210.08.727,000215319122
      D5FUAAH36XAK · cold climate16.210.08.727,000215319150
      D5FUAAH36XAK · cold climate16.210.08.727,000215319178
      D5FUAAH36XAK · cold climate16.210.08.727,000215319206
      D5FUAAH36XAK · cold climate16.210.08.727,000215318982
      D5FUAAH36XAK · cold climate16.210.08.727,000217178778
      Yearly running cost in 10 large cities$1,011-$2,551

      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 D5CURAH36AAK?
      The Day & Night D5CURAH36AAK is rated at up to 16.7 SEER2 and 10.2 EER2 for cooling and up to 9.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 30 certified matchups SEER2 ranges from 16.2-16.7.
      Is the Day & Night D5CURAH36AAK good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 29,200 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Day & Night D5CURAH36AAK cost to run per year?
      At its rated efficiency it costs about $1,011-$2,551 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,225 in Phoenix and $2,115 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 D5CURAH36AAK?
      ENERGY STAR lists 30 certified combinations for this outdoor unit. The highest-rated ones use D5MUWAQ36XA3, D5FUAAH36XAK.
      What refrigerant does the Day & Night D5CURAH36AAK 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 $1,204/yrYou save $668/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 D5CURAH36AAK
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,204
      Current system, per year
      $1,873
      You save per year
      $668
      Payback
      20.2 years
      Net after 10 years
      -$6,818

      Cooling $759Heating $446Electricity used: 7,527 kWhSaved vs. a minimum-efficiency heat pump: $234

      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 3 ton models

      See all 302 3 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 14, 2026. How we use the data.