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      2-ton central heat pump · CU series

      Panasonic CU-E24YAHK6

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

      Ranks #220 of 331 2 ton central heat pumps for cooling efficiency, and costs about $716 a year to run in a mixed climate like Atlanta.

      SEER2
      17.0 Cooling efficiency over a season
      Average · beats 49%
      HSPF2
      9.8 Heating efficiency over a season
      Very good · beats 79%
      EER2
      10.5 Cooling efficiency on a 95°F day
      Below average · beats 17%
      Heat at 5°F
      19,400 BTU/h75% of its 47°F output
      Very good · beats 76%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,400 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 79% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications2 ton, R-410A
      General
      BrandPanasonic
      Also sold asAC Pro, TRUST AIR CONDITIONERS, LBG Products
      Outdoor unit modelCU-E24YAHK6
      SeriesCU series
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceAugust 1, 2023
      Last certifiedJune 3, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.0 (range 15.7-17.0)
      EER2Efficiency at 95°F outdoors10.0-10.5
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.2-9.8
      Capacity at 47°F25,600-26,000 BTU/h
      Capacity at 17°F21,000-22,000 BTU/h
      Capacity at 5°F18,500-19,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10-2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder75% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CS-HE24YAHK6 at the standard test temperatures, in BTU/h:

      Certified matchups2 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.
      CS-HE24YAHK6 · cold climate17.010.59.219,400212396487
      CS-HE24YAC6 · cold climate15.710.09.818,500212396499
      Same unit, other model numbers3

      These model numbers have exactly the same certified ratings and matchups as the Panasonic CU-E24YAHK6: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      Yearly running cost in 10 large cities$662-$1,695

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

      Questions6
      What is the SEER2 rating of the Panasonic CU-E24YAHK6?
      The Panasonic CU-E24YAHK6 is rated at up to 17.0 SEER2 and 10.5 EER2 for cooling and up to 9.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 15.7-17.0.
      Is the Panasonic CU-E24YAHK6 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,400 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Panasonic CU-E24YAHK6 cost to run per year?
      At its rated efficiency it costs about $662-$1,695 a year in electricity in large U.S. cities, depending on climate and local rates - for example $806 in Phoenix and $1,408 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Panasonic CU-E24YAHK6 the same as the AC Pro AOX430-24HFN1-MR0?
      Yes, as far as the certified ratings go. ENERGY STAR lists 4 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the Panasonic CU-E24YAHK6?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use CS-HE24YAHK6, CS-HE24YAC6.
      What refrigerant does the Panasonic CU-E24YAHK6 use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and R-32.

      Running cost and savings

      Pre-filled with this model. Pick your city and what you heat with today; everything else is optional.

      Heat pump $794/yrYou save $476/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 Panasonic CU-E24YAHK6
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $794
      Current system, per year
      $1,270
      You save per year
      $476
      Payback
      18.9 years
      Net after 10 years
      -$4,239

      Cooling $497Heating $297Electricity used: 4,963 kWhSaved vs. a minimum-efficiency heat pump: $185

      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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      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of June 3, 2026. How we use the data.