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      4-ton central heat pump · Universal

      MRCOOL MDUO18048060

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

      Ranks #173 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,617 a year to run in a mixed climate like Atlanta.

      SEER2
      17.0 Cooling efficiency over a season
      Average · beats 49%
      HSPF2
      9.0 Heating efficiency over a season
      Average · beats 54%
      EER2
      11.0 Cooling efficiency on a 95°F day
      Below average · beats 23%
      Heat at 5°F
      41,000 BTU/h81% 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 41,000 BTU/h at 5°F.
      • 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

      Specifications4 ton, R-410A
      General
      BrandMRCOOL
      Also sold asAC Pro, GE Appliances, ECO AC, BOREAL, Continental, Napoleon, TGM, ACD
      Outdoor unit modelMDUO18048060
      SeriesUniversal
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceJanuary 1, 2023
      Last certifiedJuly 7, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.0 (range 16.0-17.0)
      EER2Efficiency at 95°F outdoors10.0-11.0
      Cooling capacity48,000-54,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.0
      Capacity at 47°F48,000-54,000 BTU/h
      Capacity at 17°F39,500-44,000 BTU/h
      Capacity at 5°F39,000-41,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder81% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with MDUI18048E 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.
      MDUI18048E · cold climate17.011.09.039,000210410119
      MDUI18060E · cold climate16.010.09.041,000210410120
      Same unit, other model numbers9

      These model numbers have exactly the same certified ratings and matchups as the MRCOOL MDUO18048060: 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$1,490-$3,829

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

      Questions6
      What is the SEER2 rating of the MRCOOL MDUO18048060?
      The MRCOOL MDUO18048060 is rated at up to 17.0 SEER2 and 11.0 EER2 for cooling and up to 9.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 16.0-17.0.
      Is the MRCOOL MDUO18048060 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 41,000 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 MRCOOL MDUO18048060 cost to run per year?
      At its rated efficiency it costs about $1,490-$3,829 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,815 in Phoenix and $3,182 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the MRCOOL MDUO18048060 the same as the AC Pro AUD60W/A1-D(U)?
      Yes, as far as the certified ratings go. ENERGY STAR lists 10 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 MRCOOL MDUO18048060?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use MDUI18048E, MDUI18060E.
      What refrigerant does the MRCOOL MDUO18048060 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 $1,790/yrYou save $994/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 MRCOOL MDUO18048060
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,790
      Current system, per year
      $2,784
      You save per year
      $994
      Payback
      20.6 years
      Net after 10 years
      -$10,557

      Cooling $1,118Heating $672Electricity used: 11,188 kWhSaved vs. a minimum-efficiency heat pump: $346

      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 July 7, 2026. How we use the data.