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      18,000 BTU mini-split heat pump · H-Series

      Fujitsu AOUH18LUAS1

      Very good cooling and heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #113 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $416 a year to run in a mixed climate like Atlanta.

      SEER2
      23.5 Cooling efficiency over a season
      Very good · beats 70%
      HSPF2
      11.2 Heating efficiency over a season
      Very good · beats 79%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Average · beats 62%
      Heat at 5°F
      17,100 BTU/h93% of its 47°F output
      Very good · beats 83%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 70% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 17,100 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 79% of mini-splits.
      • 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

      Specifications18,000 BTU, R-410A
      General
      BrandFujitsu
      Outdoor unit modelAOUH18LUAS1
      SeriesH-Series
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceApril 2, 2021
      Last certifiedJune 5, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better23.5 (range 18.6-23.5)
      EER2Efficiency at 95°F outdoors11.7-13.0
      Cooling capacity17,100-18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0-11.2
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F14,700-15,800 BTU/h
      Capacity at 5°F16,800-17,100 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.12-2.24
      ENERGY STAR cold climateYes
      Heating output as it gets colder93% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with AUUH18LUAS at the standard test temperatures, in BTU/h:

      Certified matchups4 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.
      AUUH18LUAS FUJITSU · cold climate23.513.011.216,800211078844
      ABUH18LUAS FUJITSU · cold climate22.512.510.616,800211078843
      ACUH18LUAS1 FUJITSU · cold climate21.512.511.217,100206579745
      ARUH18LUAS FUJITSU · cold climate18.611.710.016,800211078842
      Yearly running cost in 10 large cities$361-$1,005

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

      Questions5
      What is the SEER2 rating of the Fujitsu AOUH18LUAS1?
      The Fujitsu AOUH18LUAS1 is rated at up to 23.5 SEER2 and 13.0 EER2 for cooling and up to 11.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 18.6-23.5.
      Is the Fujitsu AOUH18LUAS1 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 17,100 BTU/h at 5°F with a COP of 2.24, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Fujitsu AOUH18LUAS1 cost to run per year?
      At its rated efficiency it costs about $361-$1,005 a year in electricity in large U.S. cities, depending on climate and local rates - for example $450 in Phoenix and $844 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 Fujitsu AOUH18LUAS1?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use FUJITSU AUUH18LUAS, FUJITSU ABUH18LUAS, FUJITSU ACUH18LUAS1.
      What refrigerant does the Fujitsu AOUH18LUAS1 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 $450/yrYou save $479/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 Fujitsu AOUH18LUAS1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $450
      Current system, per year
      $928
      You save per year
      $479
      Payback
      14.6 years
      Net after 10 years
      -$2,215

      Cooling $270Heating $180Electricity used: 2,810 kWhSaved vs. a minimum-efficiency heat pump: $262

      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 5, 2026. How we use the data.