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      4-ton central heat pump · D5F Series

      Day & Night D5CUHAH48AAK

      Average cooling efficiency and very good heating efficiency for a 4-ton central heat pump, and certified for cold climates.

      Ranks #134 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,375 a year to run in a mixed climate like Atlanta.

      SEER2
      17.5 Cooling efficiency over a season
      Average · beats 58%
      HSPF2
      9.5 Heating efficiency over a season
      Very good · beats 70%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Average · beats 64%
      Heat at 5°F
      48,000 BTU/h100% 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 48,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 70% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 39 certified pairings.

      Think twice if…

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

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandDay & Night
      Also sold asHeil, Smart Comfort, Midea, Arcoaire, Keeprite, Comfortmaker, Kenmore, Tempstar, Airquest, LPS Legacy, Grandaire, Viessmann
      Outdoor unit modelD5CUHAH48AAK
      SeriesD5F Series
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceNovember 15, 2018
      Last certifiedMay 1, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.5 (range 15.2-17.5)
      EER2Efficiency at 95°F outdoors10.0-12.0
      Cooling capacity45,000-48,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.8-9.5
      Capacity at 47°F48,000-50,000 BTU/h
      Capacity at 17°F34,400-39,500 BTU/h
      Capacity at 5°F42,000-48,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.85-2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder100% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with D5FUHAH60XAK at the standard test temperatures, in BTU/h:

      Certified matchups39 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.
      D5FUHAH60XAK · cold climate17.512.09.548,000215319071
      D5FUHAH60XAK · cold climate17.512.09.548,000215318903
      D5FUHAH60XAK · cold climate17.512.09.548,000215318987
      D5FUHAH60XAK · cold climate17.512.09.548,000215319015
      D5FUHAH60XAK · cold climate17.512.09.548,000215318931
      D5FUHAH60XAK · cold climate17.512.09.548,000215319043
      D5FUHAH60XAK · cold climate17.512.09.548,000215319099
      D5FUHAH60XAK · cold climate17.512.09.548,000215319127
      D5FUHAH60XAK · cold climate17.512.09.548,000215319183
      D5FUHAH60XAK · cold climate17.512.09.548,000215319211
      D5FUHAH60XAK · cold climate17.512.09.548,000215318959
      D5FUHAH60XAK · cold climate17.512.09.548,000215319155
      D5FUHAH60XAK · cold climate17.512.09.548,000217178774
      D5FUAAH48XAK · cold climate16.510.59.546,000215318948
      D5FUAAH48XAK · cold climate16.510.59.546,000215318976
      D5FUAAH48XAK · cold climate16.510.59.546,000215319116
      D5FUAAH48XAK · cold climate16.510.59.546,000215319060
      D5FUAAH48XAK · cold climate16.510.59.546,000215318892
      D5FUAAH48XAK · cold climate16.510.59.546,000215318920
      D5FUAAH48XAK · cold climate16.510.59.546,000215319032
      D5FUAAH48XAK · cold climate16.510.59.546,000215319088
      D5FUAAH48XAK · cold climate16.510.59.546,000215319144
      D5FUAAH48XAK · cold climate16.510.59.546,000215319172
      D5FUAAH48XAK · cold climate16.510.59.546,000215319200
      D5FUAAH48XAK · cold climate16.510.59.546,000215319004
      D5FUAAH48XAK · cold climate16.510.59.546,000217178769
      D5FULAH60XMX · cold climate15.210.08.842,000217456502
      D5FULAH60XMX · cold climate15.210.08.842,000217456530
      D5FULAH60XMX · cold climate15.210.08.842,000217456670
      D5FULAH60XMX · cold climate15.210.08.842,000217456586
      D5FULAH60XMX · cold climate15.210.08.842,000217456446
      D5FULAH60XMX · cold climate15.210.08.842,000217456754
      D5FULAH60XMX · cold climate15.210.08.842,000217456614
      D5FULAH60XMX · cold climate15.210.08.842,000217456698
      D5FULAH60XMX · cold climate15.210.08.842,000217456780
      D5FULAH60XMX · cold climate15.210.08.842,000217456474
      D5FULAH60XMX · cold climate15.210.08.842,000217456642
      D5FULAH60XMX · cold climate15.210.08.842,000217456558
      D5FULAH60XMX · cold climate15.210.08.842,000217456726
      Yearly running cost in 10 large cities$1,286-$3,240

      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 D5CUHAH48AAK?
      The Day & Night D5CUHAH48AAK is rated at up to 17.5 SEER2 and 12.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 39 certified matchups SEER2 ranges from 15.2-17.5.
      Is the Day & Night D5CUHAH48AAK good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 48,000 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 D5CUHAH48AAK cost to run per year?
      At its rated efficiency it costs about $1,286-$3,240 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,558 in Phoenix and $2,686 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 D5CUHAH48AAK?
      ENERGY STAR lists 39 certified combinations for this outdoor unit. The highest-rated ones use D5FUHAH60XAK, D5FUAAH48XAK, D5FULAH60XMX.
      What refrigerant does the Day & Night D5CUHAH48AAK 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 $1,531/yrYou save $944/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 D5CUHAH48AAK
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,531
      Current system, per year
      $2,475
      You save per year
      $944
      Payback
      19.1 years
      Net after 10 years
      -$8,564

      Cooling $965Heating $566Electricity used: 9,571 kWhSaved vs. a minimum-efficiency heat pump: $367

      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 4 ton models

      See all 319 4 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of May 1, 2026. How we use the data.