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      18,000 BTU mini-split heat pump · Q32

      Innovair QOS18H2XE5A

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

      Ranks #347 of 465 18,000 BTU mini-splits for cooling efficiency, and costs about $472 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      9.8 Heating efficiency over a season
      Below average · beats 33%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 19%
      Heat at 5°F
      13,700 BTU/h76% of its 47°F output
      Excellent · beats 97%

      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.
      • Cooling cost matters most - its SEER2 is below average for mini-splits.
      • You mainly need heat - its HSPF2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications18,000 BTU, R-32
      General
      BrandInnovair
      Also sold asOLMO, Hessaire
      Outdoor unit modelQOS18H2XE5A
      SeriesQ32
      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 sinceSeptember 8, 2024
      Last certifiedFebruary 11, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 20.0-21.0)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity18,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.8
      Capacity at 47°F18,000 BTU/h
      Capacity at 17°F14,800 BTU/h
      Capacity at 5°F13,400-13,700 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.40-2.50
      ENERGY STAR cold climateNo
      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 QHW18H2UZRA 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.
      QHW18H2UZRA21.012.09.813,700215493755
      QHW18H2UZRB20.012.09.813,400218030995
      Same unit, other model numbers2

      These model numbers have exactly the same certified ratings and matchups as the Innovair QOS18H2XE5A: 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$404-$1,144

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

      Questions6
      What is the SEER2 rating of the Innovair QOS18H2XE5A?
      The Innovair QOS18H2XE5A is rated at up to 21.0 SEER2 and 12.0 EER2 for cooling and up to 9.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 20.0-21.0.
      Is the Innovair QOS18H2XE5A 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 Innovair QOS18H2XE5A cost to run per year?
      At its rated efficiency it costs about $404-$1,144 a year in electricity in large U.S. cities, depending on climate and local rates - for example $507 in Phoenix and $963 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Innovair QOS18H2XE5A the same as the OLMO OS-SR18-230VO?
      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 Innovair QOS18H2XE5A?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use QHW18H2UZRA, QHW18H2UZRB.
      What refrigerant does the Innovair QOS18H2XE5A 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 $507/yrYou save $421/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 Innovair QOS18H2XE5A
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $507
      Current system, per year
      $928
      You save per year
      $421
      Payback
      16.6 years
      Net after 10 years
      -$2,793

      Cooling $302Heating $206Electricity used: 3,171 kWhSaved vs. a minimum-efficiency heat pump: $204

      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 February 11, 2026. How we use the data.