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      1.5-ton central heat pump · DRU Series

      DuraSTAR DRU1U18S2A

      Very good cooling efficiency and average heating efficiency for a 1.5-ton central heat pump, but not rated for cold climates.

      Ranks #41 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $505 a year to run in a mixed climate like Atlanta.

      SEER2
      18.8 Cooling efficiency over a season
      Very good · beats 81%
      HSPF2
      9.4 Heating efficiency over a season
      Average · beats 64%
      EER2
      11.0 Cooling efficiency on a 95°F day
      Below average · beats 23%
      Heat at 5°F
      11,400 BTU/h62% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 81% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.

      Calculate my running cost

      Details

      Specifications1.5 ton, R-454B
      General
      BrandDuraSTAR
      Outdoor unit modelDRU1U18S2A
      SeriesDRU Series
      TypeCentral heat pump
      Nominal size1.5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceDecember 8, 2024
      Last certifiedMarch 9, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.8 (range 16.1-18.8)
      EER2Efficiency at 95°F outdoors11.0-11.5
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.2-9.4
      Capacity at 47°F18,000-19,000 BTU/h
      Capacity at 17°F11,000-12,600 BTU/h
      Capacity at 5°F10,000-11,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder62% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with DRUM1824S2A 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.
      DRUM1824S2A-18.811.09.111,200215374892
      DRUF1820S2A-18.511.59.411,400217285075
      DRUC2417S2AML193DF070XE36B*17.711.08.310,000218072259
      DRUC2414S2ARL18060A12MPS117.011.08.210,000218072060
      DRUC2417S2AMGV96U060B3C16.411.08.410,000218071726
      DRUC2417S2ARL18080B12MPS116.211.28.310,000218072061
      DRUC2417S2AMGV96U080B3C16.111.08.410,000218071727
      DRUC2414S2ARL18040A12MPS116.111.08.210,000218072059
      Yearly running cost in 10 large cities$450-$1,208

      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 DRU1U18S2A?
      The DuraSTAR DRU1U18S2A is rated at up to 18.8 SEER2 and 11.0 EER2 for cooling and up to 9.4 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 8 certified matchups SEER2 ranges from 16.1-18.8.
      Is the DuraSTAR DRU1U18S2A good for cold climates?
      It is not cold-climate certified: none of its matchups meet the ENERGY STAR cold-climate criteria (a COP of at least 1.75 at 5°F among other limits). In places with frequent sub-zero nights, pick a cold-climate 1.5-ton model.
      How much does the DuraSTAR DRU1U18S2A cost to run per year?
      At its rated efficiency it costs about $450-$1,208 a year in electricity in large U.S. cities, depending on climate and local rates - for example $555 in Phoenix and $1,010 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 DRU1U18S2A?
      ENERGY STAR lists 8 certified combinations for this outdoor unit. The highest-rated ones use DRUM1824S2A, DRUF1820S2A, DRUC2417S2A.
      What refrigerant does the DuraSTAR DRU1U18S2A 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 $551/yrYou save $377/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 DRU1U18S2A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $551
      Current system, per year
      $928
      You save per year
      $377
      Payback
      18.6 years
      Net after 10 years
      -$3,234

      Cooling $337Heating $214Electricity used: 3,447 kWhSaved vs. a minimum-efficiency heat pump: $160

      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.