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      4-ton central heat pump · DRU Series

      DuraSTAR DRU1H49S2A

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

      Ranks #155 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,616 a year to run in a mixed climate like Atlanta.

      SEER2
      17.1 Cooling efficiency over a season
      Average · beats 53%
      HSPF2
      9.1 Heating efficiency over a season
      Average · beats 60%
      EER2
      10.3 Cooling efficiency on a 95°F day
      Below average · beats 16%
      Heat at 5°F
      52,000 BTU/h71% of its 47°F output
      Below average · beats 5%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 52,000 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 10 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
      BrandDuraSTAR
      Outdoor unit modelDRU1H49S2A
      SeriesDRU Series
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 8, 2020
      Last certifiedMarch 9, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.1 (range 15.6-17.1)
      EER2Efficiency at 95°F outdoors10.0-11.7
      Cooling capacity47,000-54,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.1-9.1
      Capacity at 47°F55,000-58,000 BTU/h
      Capacity at 17°F35,000-45,000 BTU/h
      Capacity at 5°F40,000-52,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder71% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with DRUC6021S2A at the standard test temperatures, in BTU/h:

      Certified matchups10 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.
      DRUC6021S2A · cold climateS9V2C100U5VS***17.110.38.440,000218071918
      DRUC6021S2A · cold climateS9V2C100D5VS***17.110.38.440,000218071917
      DRUC6021S2A · cold climateS9V2C080U5VS***17.010.28.340,000218071916
      DRUC6024S2A · cold climateS9V2D120U5VS***16.410.28.741,000218071923
      DRUC6024S2A · cold climateS9V2D120D5VS***16.410.28.741,000218071922
      DRUM4260S2A · cold climate-16.311.79.052,000215374890
      DRUC6021S2A · cold climateRG19100C20MPS116.310.08.141,000218072054
      DRUC6021S2A · cold climateMGV96U100C5C15.910.18.441,000218071749
      DRUC6021S2A · cold climateMGV96U080C4C15.710.38.641,000218071748
      DRUC6024S2A · cold climateMGV96U120D5C15.610.59.143,000218071750
      Yearly running cost in 10 large cities$1,430-$3,874

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

      Questions5
      What is the SEER2 rating of the DuraSTAR DRU1H49S2A?
      The DuraSTAR DRU1H49S2A is rated at up to 17.1 SEER2 and 10.3 EER2 for cooling and up to 9.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 10 certified matchups SEER2 ranges from 15.6-17.1.
      Is the DuraSTAR DRU1H49S2A good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 52,000 BTU/h at 5°F with a COP of 1.80, so it is still 1.8 times as efficient as electric resistance heat at that temperature.
      How much does the DuraSTAR DRU1H49S2A cost to run per year?
      At its rated efficiency it costs about $1,430-$3,874 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,770 in Phoenix and $3,242 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 DuraSTAR DRU1H49S2A?
      ENERGY STAR lists 10 certified combinations for this outdoor unit. The highest-rated ones use DRUC6021S2A, DRUC6024S2A, DRUM4260S2A.
      What refrigerant does the DuraSTAR DRU1H49S2A 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 $1,760/yrYou save $987/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 DuraSTAR DRU1H49S2A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,760
      Current system, per year
      $2,747
      You save per year
      $987
      Payback
      19.8 years
      Net after 10 years
      -$9,629

      Cooling $1,070Heating $689Electricity used: 10,998 kWhSaved vs. a minimum-efficiency heat pump: $357

      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 March 9, 2026. How we use the data.