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      18,000 BTU mini-split heat pump · Airy

      GREE GWH18AVEXF-D6DNA1A/O

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

      Ranks #1 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $427 a year to run in a mixed climate like Atlanta.

      SEER2
      27.5 Cooling efficiency over a season
      Excellent · beats 96%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      14.3 Cooling efficiency on a 95°F day
      Very good · beats 86%
      Heat at 5°F
      18,000 BTU/h97% of its 47°F output
      Below average · beats 9%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 96% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 18,000 BTU/h at 5°F.
      • 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
      BrandGREE
      Outdoor unit modelGWH18AVEXF-D6DNA1A/O
      SeriesAiry
      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 24, 2024
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better27.5 (range 20.0-27.5)
      EER2Efficiency at 95°F outdoors10.3-14.3
      Cooling capacity18,000-21,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.8-10.0
      Capacity at 47°F18,000-21,000 BTU/h
      Capacity at 17°F14,600-19,500 BTU/h
      Capacity at 5°F14,500-18,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder97% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with GWH18AVEXF-D6DN***/I at the standard test temperatures, in BTU/h:

      Certified matchups7 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.
      GWH18AVEXF-D6DN***/I · cold climate27.514.310.018,000215294863
      GFH(18)DB-D6DN***/I · cold climate24.514.09.417,000215416014
      GFH(21)DB-D6DN***/I · cold climate24.013.09.417,000215416015
      GKH(18)EB-D6DN***/I · cold climate22.011.68.815,000215416018
      GTH(18)CA-D6DN***/I · cold climate21.511.39.217,500216019854
      GKH(18)DA-D6DN***/I · cold climate20.010.89.214,500215416016
      GKH(20)DA-D6DN***/I · cold climate20.010.39.215,000215416017
      Yearly running cost in 10 large cities$311-$1,077

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

      Questions5
      What is the SEER2 rating of the GREE GWH18AVEXF-D6DNA1A/O?
      The GREE GWH18AVEXF-D6DNA1A/O is rated at up to 27.5 SEER2 and 14.3 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 7 certified matchups SEER2 ranges from 20.0-27.5.
      Is the GREE GWH18AVEXF-D6DNA1A/O good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 18,000 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 GREE GWH18AVEXF-D6DNA1A/O cost to run per year?
      At its rated efficiency it costs about $311-$1,077 a year in electricity in large U.S. cities, depending on climate and local rates - for example $418 in Phoenix and $926 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 GREE GWH18AVEXF-D6DNA1A/O?
      ENERGY STAR lists 7 certified combinations for this outdoor unit. The highest-rated ones use GWH18AVEXF-D6DN***/I, GFH(18)DB-D6DN***/I, GFH(21)DB-D6DN***/I.
      What refrigerant does the GREE GWH18AVEXF-D6DNA1A/O 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 $432/yrYou save $496/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 GREE GWH18AVEXF-D6DNA1A/O
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $432
      Current system, per year
      $928
      You save per year
      $496
      Payback
      14.1 years
      Net after 10 years
      -$2,039

      Cooling $230Heating $202Electricity used: 2,700 kWhSaved vs. a minimum-efficiency heat pump: $280

      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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      See all 465 18,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 22, 2026. How we use the data.