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      1.5-ton central heat pump · ACIQ Series

      1HVAC ACIQ-18-EHPD

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

      Ranks #47 of 170 1.5 ton central heat pumps for cooling efficiency, and costs about $515 a year to run in a mixed climate like Atlanta.

      SEER2
      18.8 Cooling efficiency over a season
      Very good · beats 81%
      HSPF2
      9.1 Heating efficiency over a season
      Average · beats 60%
      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
      Below average · beats 39%

      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
      Brand1HVAC
      Also sold asACIQ
      Outdoor unit modelACIQ-18-EHPD
      SeriesACIQ 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 sinceOctober 1, 2022
      Last certifiedNovember 24, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better18.8 (range 16.8-18.8)
      EER2Efficiency at 95°F outdoors11.0-11.5
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.8-9.1
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F11,800-12,600 BTU/h
      Capacity at 5°F11,200-11,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-2.00
      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 ACIQ-18-AHD 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.
      ACIQ-18-AHD18.811.09.111,200216032221
      ACIQ-18-AHD18.811.09.111,200216032240
      ACIQ-18W-PB16.811.58.811,400216980825
      ACIQ-18W-PB16.811.58.811,400216980789
      Yearly running cost in 10 large cities$450-$1,241

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

      Questions5
      What is the SEER2 rating of the 1HVAC ACIQ-18-EHPD?
      The 1HVAC ACIQ-18-EHPD is rated at up to 18.8 SEER2 and 11.0 EER2 for cooling and up to 9.1 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 16.8-18.8.
      Is the 1HVAC ACIQ-18-EHPD 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 1HVAC ACIQ-18-EHPD cost to run per year?
      At its rated efficiency it costs about $450-$1,241 a year in electricity in large U.S. cities, depending on climate and local rates - for example $560 in Phoenix and $1,040 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 1HVAC ACIQ-18-EHPD?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use ACIQ-18-AHD, ACIQ-18W-PB.
      What refrigerant does the 1HVAC ACIQ-18-EHPD 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 $559/yrYou save $370/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-18-EHPD
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $559
      Current system, per year
      $928
      You save per year
      $370
      Payback
      18.9 years
      Net after 10 years
      -$3,304

      Cooling $337Heating $222Electricity used: 3,491 kWhSaved vs. a minimum-efficiency heat pump: $153

      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.

      Similar 1.5 ton models

      See all 170 1.5 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of November 24, 2025. How we use the data.