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      18,000 BTU mini-split heat pump · Pro

      GARVEE GMS18 PRO

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

      Ranks #154 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $467 a year to run in a mixed climate like Atlanta.

      SEER2
      23.0 Cooling efficiency over a season
      Average · beats 62%
      HSPF2
      9.5 Heating efficiency over a season
      Below average · beats 24%
      EER2
      12.5 Cooling efficiency on a 95°F day
      Average · beats 44%
      Heat at 5°F
      13,600 BTU/h76% of its 47°F output
      Below average · beats 9%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 13,600 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You mainly need heat - its HSPF2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-454B
      General
      BrandGARVEE
      Outdoor unit modelGMS18 PRO
      SeriesPro
      TypeMini-split heat pump
      Nominal size18,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceFebruary 15, 2025
      Last certifiedMarch 31, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better23.0 (range 23.0)
      EER2Efficiency at 95°F outdoors12.5
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.5
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F11,000 BTU/h
      Capacity at 5°F13,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80
      ENERGY STAR cold climateYes
      Heating output as it gets colder76% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with GMS18 PRO at the standard test temperatures, in BTU/h:

      Certified matchups1 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.
      GMS18 PRO · cold climate23.012.59.513,600216980966
      Yearly running cost in 10 large cities$370-$1,156

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

      Questions5
      What is the SEER2 rating of the GARVEE GMS18 PRO?
      The GARVEE GMS18 PRO is rated at up to 23.0 SEER2 and 12.5 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the GARVEE GMS18 PRO good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 13,600 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 GARVEE GMS18 PRO cost to run per year?
      At its rated efficiency it costs about $370-$1,156 a year in electricity in large U.S. cities, depending on climate and local rates - for example $479 in Phoenix and $983 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 GARVEE GMS18 PRO?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses GMS18 PRO.
      What refrigerant does the GARVEE GMS18 PRO 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 $488/yrYou save $440/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 GARVEE GMS18 PRO
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $488
      Current system, per year
      $928
      You save per year
      $440
      Payback
      15.9 years
      Net after 10 years
      -$2,596

      Cooling $275Heating $212Electricity used: 3,048 kWhSaved vs. a minimum-efficiency heat pump: $224

      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 March 31, 2025. How we use the data.