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      9,000 BTU mini-split heat pump · OAH Series

      TRUST AIR CONDITIONERS OAH09H/O6S4P

      Excellent cooling and heating efficiency for a 9,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #125 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $188 a year to run in a mixed climate like Atlanta.

      SEER2
      26.0 Cooling efficiency over a season
      Excellent · beats 91%
      HSPF2
      13.8 Heating efficiency over a season
      Excellent · beats 97%
      EER2
      15.0 Cooling efficiency on a 95°F day
      Excellent · beats 91%
      Heat at 5°F
      11,900 BTU/h96% of its 47°F output
      Below average · beats 22%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 91% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 11,900 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 97% of mini-splits.
      • 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

      Specifications9,000 BTU, R-454B
      General
      BrandTRUST AIR CONDITIONERS
      Also sold asMulti MFG
      Outdoor unit modelOAH09H/O6S4P
      SeriesOAH Series
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceAugust 20, 2025
      Last certifiedJuly 29, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better26.0 (range 20.5-26.0)
      EER2Efficiency at 95°F outdoors13.4-15.0
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better12.1-13.8
      Capacity at 47°F9,900-12,000 BTU/h
      Capacity at 17°F9,000-12,000 BTU/h
      Capacity at 5°F10,600-11,900 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.80-1.89
      ENERGY STAR cold climateYes
      Heating output as it gets colder96% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with IUMW109H/I61P at the standard test temperatures, in BTU/h:

      Certified matchups5 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.
      IUMW109H/I61P · cold climate26.015.012.511,500217678066
      IUMC109H/I61P · cold climate24.014.612.110,600217678095
      IUMC409H/I61P · cold climate22.614.012.111,000217678071
      IUMDL09H/I63P · cold climate21.413.412.511,200217678077
      IUMDH09H/I63P · cold climate20.514.013.811,900217678080
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the TRUST AIR CONDITIONERS OAH09H/O6S4P: 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$163-$453

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

      Questions6
      What is the SEER2 rating of the TRUST AIR CONDITIONERS OAH09H/O6S4P?
      The TRUST AIR CONDITIONERS OAH09H/O6S4P is rated at up to 26.0 SEER2 and 15.0 EER2 for cooling and up to 13.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 5 certified matchups SEER2 ranges from 20.5-26.0.
      Is the TRUST AIR CONDITIONERS OAH09H/O6S4P good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 11,900 BTU/h at 5°F with a COP of 1.89, so it is still 1.9 times as efficient as electric resistance heat at that temperature.
      How much does the TRUST AIR CONDITIONERS OAH09H/O6S4P cost to run per year?
      At its rated efficiency it costs about $163-$453 a year in electricity in large U.S. cities, depending on climate and local rates - for example $203 in Phoenix and $381 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the TRUST AIR CONDITIONERS OAH09H/O6S4P the same as the Multi MFG MSH-09HD-B?
      Yes, as far as the certified ratings go. ENERGY STAR lists both 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 TRUST AIR CONDITIONERS OAH09H/O6S4P?
      ENERGY STAR lists 5 certified combinations for this outdoor unit. The highest-rated ones use IUMW109H/I61P, IUMC109H/I61P, IUMC409H/I61P.
      What refrigerant does the TRUST AIR CONDITIONERS OAH09H/O6S4P 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 $203/yrYou save $277/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 TRUST AIR CONDITIONERS OAH09H/O6S4P
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $203
      Current system, per year
      $480
      You save per year
      $277
      Payback
      12.6 years
      Net after 10 years
      -$726

      Cooling $122Heating $81Electricity used: 1,269 kWhSaved vs. a minimum-efficiency heat pump: $168

      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 395 9,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of July 29, 2026. How we use the data.