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      18,000 BTU mini-split heat pump · CASSETTE-single

      ROVSUN RV-18M2/O-R

      Average cooling efficiency and below average heating efficiency for a 18,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #155 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $519 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
      11.2 Cooling efficiency on a 95°F day
      Below average · beats 11%
      Heat at 5°F
      14,000 BTU/h70% of its 47°F output
      Average · beats 48%

      A good fit if…

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

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-32
      General
      BrandROVSUN
      Outdoor unit modelRV-18M2/O-R
      SeriesCASSETTE-single
      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 sinceAugust 13, 2025
      Last certifiedMay 29, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better23.0 (range 23.0)
      EER2Efficiency at 95°F outdoors11.2
      Cooling capacity20,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.5
      Capacity at 47°F20,000 BTU/h
      Capacity at 17°F14,000 BTU/h
      Capacity at 5°F14,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00
      ENERGY STAR cold climateNo
      Heating output as it gets colder70% 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 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.
      -23.011.29.514,000218035872
      Yearly running cost in 10 large cities$412-$1,284

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

      Questions4
      What is the SEER2 rating of the ROVSUN RV-18M2/O-R?
      The ROVSUN RV-18M2/O-R is rated at up to 23.0 SEER2 and 11.2 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 ROVSUN RV-18M2/O-R 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 18,000 BTU model.
      How much does the ROVSUN RV-18M2/O-R cost to run per year?
      At its rated efficiency it costs about $412-$1,284 a year in electricity in large U.S. cities, depending on climate and local rates - for example $533 in Phoenix and $1,093 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      What refrigerant does the ROVSUN RV-18M2/O-R 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 $542/yrYou save $489/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 ROVSUN RV-18M2/O-R
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $542
      Current system, per year
      $1,031
      You save per year
      $489
      Payback
      15.3 years
      Net after 10 years
      -$2,606

      Cooling $306Heating $236Electricity used: 3,387 kWhSaved vs. a minimum-efficiency heat pump: $249

      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 May 29, 2026. How we use the data.