HVAC Rated
    Menu

      3-ton central heat pump · ConstantComfort 20 VS HP

      Day & Night C5H0V36*K*AAA

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

      Ranks #38 of 302 3 ton central heat pumps for cooling efficiency, and costs about $961 a year to run in a mixed climate like Atlanta.

      SEER2
      19.5 Cooling efficiency over a season
      Excellent · beats 91%
      HSPF2
      9.5 Heating efficiency over a season
      Very good · beats 70%
      EER2
      11.5 Cooling efficiency on a 95°F day
      Below average · beats 31%
      Heat at 5°F
      26,000 BTU/h72% of its 47°F output
      Average · beats 48%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 91% of central heat pumps.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 26,000 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.

      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 asComfortmaker, Keeprite
      Outdoor unit modelC5H0V36*K*AAA
      SeriesConstantComfort 20 VS HP
      TypeCentral heat pump
      Nominal size3 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJune 12, 2023
      Last certifiedMay 1, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.5 (range 16.0-19.5)
      EER2Efficiency at 95°F outdoors9.0-11.5
      Cooling capacity32,600-35,400 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.5-9.5
      Capacity at 47°F34,000-36,200 BTU/h
      Capacity at 17°F29,400-31,400 BTU/h
      Capacity at 5°F24,400-26,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.75-2.04
      ENERGY STAR cold climateYes
      Heating output as it gets colder72% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with FCMA5B60L0D*+WALLCON at the standard test temperatures, in BTU/h:

      Certified matchups900 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. The 60 highest-rated of 900 are shown. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      FCMA5B60L0D*+WALLCON · cold climate-19.511.59.524,400215670621
      FCMA5B60L0D*+WALLCON · cold climate-19.511.59.524,400215670622
      FCMA5B60L0D*+WALLCON · cold climate-19.511.59.524,400215670623
      FCMA5B48L0C*+WALLCON · cold climate-19.011.09.024,600215662850
      FCMA5B48L0C*+WALLCON · cold climate-19.011.09.024,600215662848
      FCMA5B48L0C*+WALLCON · cold climate-19.011.09.024,600215662846
      EA*5X61M21A*+WALLCON · cold climate*96CTN1002122B*18.510.59.024,800215669608
      EA*5X61M24A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,600215669647
      EA*5X61M24A*+WALLCON · cold climate*96CTN1202422B*18.510.59.024,800215669738
      EA*5X60M24A*+WALLCON · cold climate*80CTL1352422B*18.510.59.024,600215669337
      EA*5X60M24A*+WALLCON · cold climate*96CTN1202422B*18.510.59.024,800215669419
      EA*5X61M21A*+WALLCON · cold climate*80CSU0401712A*18.510.09.024,800215669427
      EA*5X61M24A*+WALLCON · cold climate*80CTL0702120B*18.510.09.024,800215669628
      FCMA5B36L0C*+WALLCON · cold climate-18.510.09.025,600215670611
      EA*5X61M24A*+WALLCON · cold climate*80CTL0702120B*18.510.09.024,800215669629
      EA*5X61M24A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,600215669648
      EA*5X61M21A*+WALLCON · cold climate*80CTL0901716B*18.510.09.024,800215669488
      EA*5X60M24A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,600215669328
      EA*5X60M24A*+WALLCON · cold climate*80CTL0902120B*18.510.59.024,600215669317
      EA*5X61M21A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,800215669499
      EA*5X61M21A*+WALLCON · cold climate*97CMN1002122B*18.510.59.024,800215669577
      EA*5X60M24A*+WALLCON · cold climate*80CTL0902120B*18.510.59.024,600215669319
      EA*5X61M21A*+WALLCON · cold climate*80CTL0702120B*18.510.09.024,800215669477
      EA*5X61M21A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,800215669498
      EA*5X61M24A*+WALLCON · cold climate*80CTL1352422B*18.510.59.024,600215669658
      EA*5X61M21A*+WALLCON · cold climate*80CTL0702120B*18.510.09.024,800215669478
      EA*5X61M21A*+WALLCON · cold climate*80CTL0901716B*18.510.09.024,800215669487
      EA*5X61M24A*+WALLCON · cold climate*97CMN1202422B*18.510.59.024,800215669718
      EA*5X61M24A*+WALLCON · cold climate*96CTN1002122B*18.510.59.024,800215669729
      EA*5X60M24A*+WALLCON · cold climate*80CTL1352422B*18.510.59.024,600215669338
      EA*5X61M24A*+WALLCON · cold climate*80CTL0902120B*18.510.59.024,600215669638
      EA*5X61M24A*+WALLCON · cold climate*95CSU1002122B*18.510.09.024,600215669677
      EA*5X60M24A*+WALLCON · cold climate*97CTN1202422A*18.510.59.024,800215679589
      EA*5X61M21A*+WALLCON · cold climate*96CTN1002122B*18.510.59.024,800215669607
      FCMA5B36L0C*+WALLCON · cold climate-18.510.09.025,600215670612
      EA*5X61M24A*+WALLCON · cold climate*80CTL0902120B*18.510.59.024,600215669639
      EA*5X61M24A*+WALLCON · cold climate*96CTN1202422B*18.510.59.024,800215669739
      EA*5X61M21A*+WALLCON · cold climate*80CSU0401712A*18.510.09.024,800215669429
      EA*5X61M21A*+WALLCON · cold climate*80CSU0401712A*18.510.09.024,800215669428
      EA*5X60M24A*+WALLCON · cold climate*80CTL0902120B*18.510.59.024,600215669318
      EA*5X60M24A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,600215669327
      EA*5X60M24A*+WALLCON · cold climate*97CMN1202422B*18.510.09.024,800215669398
      EA*5X60M24A*+WALLCON · cold climate*96CTN1202422B*18.510.59.024,800215669417
      EA*5X60M24A*+WALLCON · cold climate*97CTN1202422A*18.510.59.024,800215679590
      EA*5X61M21A*+WALLCON · cold climate*97CTN1002122A*18.510.59.024,800215679658
      EA*5X61M21A*+WALLCON · cold climate*96CTN1002122B*18.510.59.024,800215669609
      EA*5X61M21A*+WALLCON · cold climate*80CTL0901716B*18.510.09.024,800215669489
      FCMA5B36L0C*+WALLCON · cold climate-18.510.09.025,600215670613
      EA*5X61M24A*+WALLCON · cold climate*80CTL1352422B*18.510.59.024,600215669659
      EA*5X61M21A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,800215669497
      EA*5X61M24A*+WALLCON · cold climate*97CMN1202422B*18.510.59.024,800215669719
      EA*5X61M24A*+WALLCON · cold climate*96CTN1002122B*18.510.59.024,800215669727
      EA*5X61M24A*+WALLCON · cold climate*96CTN1202422B*18.510.59.024,800215669737
      EA*5X61M24A*+WALLCON · cold climate*97CMN1002122B*18.510.59.024,800215669708
      EA*5X61M24A*+WALLCON · cold climate*97CMN1002122B*18.510.59.024,800215669709
      EA*5X60M24A*+WALLCON · cold climate*97CTN1002122A*18.510.59.024,800215679578
      EA*5X60M24A*+WALLCON · cold climate*97CTN1002122A*18.510.59.024,800215679579
      EA*5X61M21A*+WALLCON · cold climate*97CTN1002122A*18.510.59.024,800215679660
      EA*5X61M21A*+WALLCON · cold climate*97CMN1002122B*18.510.59.024,800215669578
      EA*5X61M24A*+WALLCON · cold climate*80CTL1102120B*18.510.59.024,600215669649
      Yearly running cost in 10 large cities$826-$2,325

      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 C5H0V36*K*AAA?
      The Day & Night C5H0V36*K*AAA is rated at up to 19.5 SEER2 and 11.5 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 900 certified matchups SEER2 ranges from 16.0-19.5.
      Is the Day & Night C5H0V36*K*AAA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 26,000 BTU/h at 5°F with a COP of 2.04, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the Day & Night C5H0V36*K*AAA cost to run per year?
      At its rated efficiency it costs about $826-$2,325 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,034 in Phoenix and $1,955 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 C5H0V36*K*AAA?
      ENERGY STAR lists 900 certified combinations for this outdoor unit. The highest-rated ones use FCMA5B60L0D*+WALLCON, FCMA5B48L0C*+WALLCON, EA*5X61M21A*+WALLCON.
      What refrigerant does the Day & Night C5H0V36*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 $1,035/yrYou save $748/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 C5H0V36*K*AAA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,035
      Current system, per year
      $1,783
      You save per year
      $748
      Payback
      17.4 years
      Net after 10 years
      -$5,516

      Cooling $617Heating $417Electricity used: 6,467 kWhSaved vs. a minimum-efficiency heat pump: $336

      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 May 1, 2026. How we use the data.