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      18,000 BTU mini-split heat pump · Airy

      TOSOT TWH18AD32AO

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

      Ranks #3 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
      BrandTOSOT
      Also sold asGREE, Kinghome
      Outdoor unit modelTWH18AD32AO
      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°F15,500-19,500 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 TWH18AD32AI 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.
      TWH18AD32AI · cold climate27.514.310.018,000217992261
      TFH18D32AI · cold climate24.514.09.417,000218001450
      TFH21D32AI GREE · cold climate24.013.09.417,000218034081
      TKH18D32AI · cold climate22.011.68.815,000218001452
      TTH18D32AI · cold climate21.511.39.217,500218001453
      TLH18D32AI · cold climate20.010.89.214,500218001451
      TLH20D32AI GREE · cold climate20.010.39.215,000218034082
      Same unit, other model numbers2

      These model numbers have exactly the same certified ratings and matchups as the TOSOT TWH18AD32AO: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      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.

      Questions6
      What is the SEER2 rating of the TOSOT TWH18AD32AO?
      The TOSOT TWH18AD32AO 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 TOSOT TWH18AD32AO 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 TOSOT TWH18AD32AO 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.
      Is the TOSOT TWH18AD32AO the same as the GREE GWH18AVEXF-D6DNA1B/O?
      Yes, as far as the certified ratings go. ENERGY STAR lists 3 model numbers with identical efficiency, capacity and matchups, which means the same outdoor unit sold under a different brand or with a minor variant code (voltage, colour or region). The full list is on this page.
      Which indoor units work with the TOSOT TWH18AD32AO?
      ENERGY STAR lists 7 certified combinations for this outdoor unit. The highest-rated ones use TWH18AD32AI, TFH18D32AI, GREE TFH21D32AI.
      What refrigerant does the TOSOT TWH18AD32AO 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 TOSOT TWH18AD32AO
      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.

      Similar 18,000 BTU models

      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.