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      18,000 BTU mini-split heat pump · ACIQ

      1HVAC ACIQ-18Z-HH-M2B

      Average cooling efficiency and below average heating efficiency for a 18,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #225 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $508 a year to run in a mixed climate like Atlanta.

      SEER2
      22.0 Cooling efficiency over a season
      Average · beats 48%
      HSPF2
      9.8 Heating efficiency over a season
      Below average · beats 33%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Average · beats 44%
      Heat at 5°F
      19,700 BTU/h99% of its 47°F output
      Below average · beats 27%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 19,700 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 15 certified pairings.

      Think twice if…

      • You mainly need heat - its HSPF2 is below average for mini-splits.
      • 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
      Brand1HVAC
      Also sold asDIYCOOL, ACIQ, STEALTH, PolarWave
      Outdoor unit modelACIQ-18Z-HH-M2B
      SeriesACIQ
      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 sinceOctober 1, 2022
      Last certifiedJune 13, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better22.0 (range 19.0-22.0)
      EER2Efficiency at 95°F outdoors12.0-12.5
      Cooling capacity19,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.3-9.8
      Capacity at 47°F20,000 BTU/h
      Capacity at 17°F15,000-16,000 BTU/h
      Capacity at 5°F19,000-19,700 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.85-1.90
      ENERGY STAR cold climateYes
      Heating output as it gets colder99% kept at 5°F

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

      Certified matchups15 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.
      - · cold climate22.012.59.819,700207825564
      - DIYCOOL · cold climate22.012.59.819,700207825588
      - ACIQ · cold climate22.012.59.819,700207825576
      - STEALTH · cold climate22.012.59.819,700212316171
      - PolarWave · cold climate22.012.59.819,700212316085
      - STEALTH · cold climate20.512.39.619,300212316173
      - PolarWave · cold climate20.512.39.619,300212316087
      - ACIQ · cold climate20.512.39.619,300207825578
      - DIYCOOL · cold climate20.512.39.619,300207825590
      - · cold climate20.512.39.619,300207825566
      - · cold climate19.012.09.319,000207825565
      - DIYCOOL · cold climate19.012.09.319,000207825589
      - ACIQ · cold climate19.012.09.319,000207825577
      - PolarWave · cold climate19.012.09.319,000212316086
      - STEALTH · cold climate19.012.09.319,000212316172
      Yearly running cost in 10 large cities$408-$1,250

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

      Questions4
      What is the SEER2 rating of the 1HVAC ACIQ-18Z-HH-M2B?
      The 1HVAC ACIQ-18Z-HH-M2B is rated at up to 22.0 SEER2 and 12.5 EER2 for cooling and up to 9.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 15 certified matchups SEER2 ranges from 19.0-22.0.
      Is the 1HVAC ACIQ-18Z-HH-M2B good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 19,700 BTU/h at 5°F with a COP of 1.90, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the 1HVAC ACIQ-18Z-HH-M2B cost to run per year?
      At its rated efficiency it costs about $408-$1,250 a year in electricity in large U.S. cities, depending on climate and local rates - for example $525 in Phoenix and $1,061 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      What refrigerant does the 1HVAC ACIQ-18Z-HH-M2B 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 $533/yrYou save $463/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 1HVAC ACIQ-18Z-HH-M2B
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $533
      Current system, per year
      $996
      You save per year
      $463
      Payback
      15.1 years
      Net after 10 years
      -$2,365

      Cooling $304Heating $229Electricity used: 3,329 kWhSaved vs. a minimum-efficiency heat pump: $234

      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 13, 2026. How we use the data.