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      9,000 BTU mini-split heat pump · KUSAF091F

      LG KUSAF091F

      Below average cooling and heating efficiency for a 9,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #393 of 395 9,000 BTU mini-splits for cooling efficiency, and costs about $324 a year to run in a mixed climate like Atlanta.

      SEER2
      18.0 Cooling efficiency over a season
      Below average · beats 4%
      HSPF2
      8.0 Heating efficiency over a season
      Below average · beats 0%
      EER2
      11.5 Cooling efficiency on a 95°F day
      Below average · beats 13%
      Heat at 5°F
      7,700 BTU/h71% 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.
      • 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

      Specifications9,000 BTU, R-32
      General
      BrandLG
      Outdoor unit modelKUSAF091F
      SeriesKUSAF091F
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceFebruary 6, 2026
      Last certifiedFebruary 11, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.0 (range 18.0)
      EER2Efficiency at 95°F outdoors11.5
      Cooling capacity9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.0
      Capacity at 47°F10,900 BTU/h
      Capacity at 17°F6,300 BTU/h
      Capacity at 5°F7,700 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00
      ENERGY STAR cold climateNo
      Heating output as it gets colder71% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with KNSAF091F 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.
      KNSAF091F18.011.58.07,700218070879
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the LG KUSAF091F: the same equipment under another brand, or a variant code for voltage, colour or market. Everything on this page applies to them.

      • LG KUSAG091G
      Yearly running cost in 10 large cities$238-$816

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

      Questions6
      What is the SEER2 rating of the LG KUSAF091F?
      The LG KUSAF091F is rated at up to 18.0 SEER2 and 11.5 EER2 for cooling and up to 8.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the LG KUSAF091F 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 9,000 BTU model.
      How much does the LG KUSAF091F cost to run per year?
      At its rated efficiency it costs about $238-$816 a year in electricity in large U.S. cities, depending on climate and local rates - for example $318 in Phoenix and $701 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the LG KUSAF091F the same as the LG KUSAG091G?
      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 LG KUSAF091F?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses KNSAF091F.
      What refrigerant does the LG KUSAF091F 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 $329/yrYou save $167/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 LG KUSAF091F
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $329
      Current system, per year
      $495
      You save per year
      $167
      Payback
      21.0 years
      Net after 10 years
      -$1,834

      Cooling $176Heating $153Electricity used: 2,054 kWhSaved vs. a minimum-efficiency heat pump: $56

      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.