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      3-ton central heat pump · CU Series

      Panasonic CU-HM36BAHU

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

      Ranks #142 of 302 3 ton central heat pumps for cooling efficiency, and costs about $985 a year to run in a mixed climate like Atlanta.

      SEER2
      17.4 Cooling efficiency over a season
      Average · beats 55%
      HSPF2
      10.3 Heating efficiency over a season
      Excellent · beats 92%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      39,000 BTU/h105% of its 47°F output
      Below average · beats 20%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 39,000 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 92% 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
      BrandPanasonic
      Outdoor unit modelCU-HM36BAHU
      SeriesCU 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 30, 2024
      Last certifiedOctober 27, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better17.4 (range 15.6-17.4)
      EER2Efficiency at 95°F outdoors10.6-11.7
      Cooling capacity36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.3-10.3
      Capacity at 47°F36,000-38,000 BTU/h
      Capacity at 17°F28,000-31,800 BTU/h
      Capacity at 5°F33,000-39,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.90
      ENERGY STAR cold climateYes
      Heating output as it gets colder105% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CS-HM36BAHU at the standard test temperatures, in BTU/h:

      Certified matchups8 indoor units

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

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CS-HM36BAHU · cold climate-17.411.710.339,000216505882
      CS-HM36BAAU3 · cold climateS9V2C100D5VS***16.211.09.333,000217900476
      CS-HM36BAAU3 · cold climateS9V2C100U5VS***16.211.09.333,000217900477
      CS-HM36BAAU3 · cold climateS9V2C080U5VS***16.010.99.433,000217900475
      CS-HM36BAAU2 · cold climate-15.810.79.436,000216621501
      CS-HM36BAAU3 · cold climate-15.810.79.436,000216621502
      CS-HM36BAAU3 · cold climateS9X2C080U5PSB**15.610.69.333,000217900570
      CS-HM36BAAU3 · cold climateS9X1C080U5PSB**15.610.69.333,000217900484
      Yearly running cost in 10 large cities$925-$2,283

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

      Questions5
      What is the SEER2 rating of the Panasonic CU-HM36BAHU?
      The Panasonic CU-HM36BAHU is rated at up to 17.4 SEER2 and 11.7 EER2 for cooling and up to 10.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 8 certified matchups SEER2 ranges from 15.6-17.4.
      Is the Panasonic CU-HM36BAHU good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 39,000 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the Panasonic CU-HM36BAHU cost to run per year?
      At its rated efficiency it costs about $925-$2,283 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,151 in Phoenix and $1,875 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 Panasonic CU-HM36BAHU?
      ENERGY STAR lists 8 certified combinations for this outdoor unit. The highest-rated ones use CS-HM36BAHU, CS-HM36BAAU3, CS-HM36BAAU2.
      What refrigerant does the Panasonic CU-HM36BAHU 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 $1,120/yrYou save $737/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-HM36BAHU
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,120
      Current system, per year
      $1,856
      You save per year
      $737
      Payback
      18.3 years
      Net after 10 years
      -$6,135

      Cooling $728Heating $391Electricity used: 6,998 kWhSaved vs. a minimum-efficiency heat pump: $304

      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 October 27, 2025. How we use the data.