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      18,000 BTU mini-split heat pump · Multi-spilt series

      NG Trade MOSA32181

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

      Ranks #222 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $456 a year to run in a mixed climate like Atlanta.

      SEER2
      22.0 Cooling efficiency over a season
      Average · beats 48%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      12.3 Cooling efficiency on a 95°F day
      Below average · beats 35%
      Heat at 5°F
      14,500 BTU/h81% of its 47°F output
      Average · beats 48%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 14,500 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
      BrandNG Trade
      Outdoor unit modelMOSA32181
      SeriesMulti-spilt series
      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 sinceJune 30, 2025
      Last certifiedJune 25, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better22.0 (range 19.5-22.0)
      EER2Efficiency at 95°F outdoors11.8-12.3
      Cooling capacity17,700 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.5-10.0
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F14,000-14,700 BTU/h
      Capacity at 5°F14,000-14,500 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.90-2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder81% 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 matchups2 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.
      - NG TRADE · cold climate22.012.310.014,500218029189
      - NG TRADE · cold climate19.511.89.514,000217501890
      Yearly running cost in 10 large cities$380-$1,113

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

      Questions4
      What is the SEER2 rating of the NG Trade MOSA32181?
      The NG Trade MOSA32181 is rated at up to 22.0 SEER2 and 12.3 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 2 certified matchups SEER2 ranges from 19.5-22.0.
      Is the NG Trade MOSA32181 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 14,500 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the NG Trade MOSA32181 cost to run per year?
      At its rated efficiency it costs about $380-$1,113 a year in electricity in large U.S. cities, depending on climate and local rates - for example $482 in Phoenix and $940 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      What refrigerant does the NG Trade MOSA32181 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 $485/yrYou save $433/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 NG Trade MOSA32181
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $485
      Current system, per year
      $918
      You save per year
      $433
      Payback
      15.0 years
      Net after 10 years
      -$2,172

      Cooling $283Heating $202Electricity used: 3,030 kWhSaved vs. a minimum-efficiency heat pump: $220

      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 June 25, 2026. How we use the data.