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      18,000 BTU mini-split heat pump · airCore700

      Hitachi PAS-18BUFASDQ1

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

      Ranks #29 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $442 a year to run in a mixed climate like Atlanta.

      SEER2
      25.0 Cooling efficiency over a season
      Very good · beats 83%
      HSPF2
      11.0 Heating efficiency over a season
      Very good · beats 75%
      EER2
      15.0 Cooling efficiency on a 95°F day
      Excellent · beats 91%
      Heat at 5°F
      16,200 BTU/h81% of its 47°F output
      Excellent · beats 99%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 83% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 16,200 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 75% of mini-splits.
      • 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

      Specifications18,000 BTU, R-32
      General
      BrandHitachi
      Outdoor unit modelPAS-18BUFASDQ1
      SeriesairCore700
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceJuly 30, 2024
      Last certifiedAugust 11, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better25.0 (range 17.8-25.0)
      EER2Efficiency at 95°F outdoors11.7-15.0
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.4-11.0
      Capacity at 47°F19,000-20,000 BTU/h
      Capacity at 17°F15,400-17,600 BTU/h
      Capacity at 5°F14,200-16,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10-2.60
      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 PCI-B18UFA1DQ at the standard test temperatures, in BTU/h:

      Certified matchups6 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.
      PCI-B18UFA1DQ HITACHI · cold climate25.015.011.016,200214723258
      PPK-B18UFA1DQ HITACHI · cold climate23.014.010.014,800216439096
      PPFC-B18UFA1DQ HITACHI · cold climate21.013.011.014,600214779298
      PPIM-B18UFA1DQ HITACHI · cold climate19.213.09.514,800213685838
      JPE18B3XB2HS1A HITACHI · cold climate17.811.79.414,200214911491
      JPE18B3XB2HS2 HITACHI · cold climate17.811.79.414,200218700901
      Yearly running cost in 10 large cities$341-$1,102

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

      Questions5
      What is the SEER2 rating of the Hitachi PAS-18BUFASDQ1?
      The Hitachi PAS-18BUFASDQ1 is rated at up to 25.0 SEER2 and 15.0 EER2 for cooling and up to 11.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 6 certified matchups SEER2 ranges from 17.8-25.0.
      Is the Hitachi PAS-18BUFASDQ1 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 16,200 BTU/h at 5°F with a COP of 2.60, so it is still 2.6 times as efficient as electric resistance heat at that temperature.
      How much does the Hitachi PAS-18BUFASDQ1 cost to run per year?
      At its rated efficiency it costs about $341-$1,102 a year in electricity in large U.S. cities, depending on climate and local rates - for example $447 in Phoenix and $941 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 Hitachi PAS-18BUFASDQ1?
      ENERGY STAR lists 6 certified combinations for this outdoor unit. The highest-rated ones use HITACHI PCI-B18UFA1DQ, HITACHI PPK-B18UFA1DQ, HITACHI PPFC-B18UFA1DQ.
      What refrigerant does the Hitachi PAS-18BUFASDQ1 use?
      It uses 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 $457/yrYou save $504/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 Hitachi PAS-18BUFASDQ1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $457
      Current system, per year
      $961
      You save per year
      $504
      Payback
      13.9 years
      Net after 10 years
      -$1,962

      Cooling $253Heating $204Electricity used: 2,857 kWhSaved vs. a minimum-efficiency heat pump: $285

      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 August 11, 2026. How we use the data.