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      9,000 BTU mini-split heat pump · BMS500

      Bosch BMS500-AAS009-1CSXRC

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

      Ranks #93 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
      26.5 Cooling efficiency over a season
      Excellent · beats 93%
      HSPF2
      13.6 Heating efficiency over a season
      Excellent · beats 97%
      EER2
      15.8 Cooling efficiency on a 95°F day
      Excellent · beats 95%
      Heat at 5°F
      8,000 BTU/h107% of its 47°F output
      Very good · beats 75%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 93% of mini-splits.
      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 8,000 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…

      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications9,000 BTU, R-410A
      General
      BrandBosch
      Also sold asMDV, MOOVAIR, TRUST AIR CONDITIONERS
      Outdoor unit modelBMS500-AAS009-1CSXRC
      SeriesBMS500
      TypeMini-split heat pump
      Nominal size9,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceJanuary 1, 2022
      Last certifiedApril 27, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better26.5 (range 19.2-26.5)
      EER2Efficiency at 95°F outdoors12.5-15.8
      Cooling capacity6,000-9,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0-13.6
      Capacity at 47°F7,000-10,000 BTU/h
      Capacity at 17°F7,500-8,500 BTU/h
      Capacity at 5°F7,400-8,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.90-2.17
      ENERGY STAR cold climateYes
      Heating output as it gets colder107% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with BMS500-AAU006-1AHWXC at the standard test temperatures, in BTU/h:

      Certified matchups4 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.
      BMS500-AAU006-1AHWXC BOSCH · cold climate26.515.813.67,500207759993
      BMS500-AAU009-1AHWXC BOSCH · cold climate25.515.012.37,500207759989
      BMS500-AAU009-1AHCXB BOSCH · cold climate20.013.010.07,400207760012
      BMS500-AAU009-1AHDXB BOSCH · cold climate19.212.510.28,000207760000
      Same unit, other model numbers3

      These model numbers have exactly the same certified ratings and matchups as the Bosch BMS500-AAS009-1CSXRC: 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$160-$457

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

      Questions6
      What is the SEER2 rating of the Bosch BMS500-AAS009-1CSXRC?
      The Bosch BMS500-AAS009-1CSXRC is rated at up to 26.5 SEER2 and 15.8 EER2 for cooling and up to 13.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 4 certified matchups SEER2 ranges from 19.2-26.5.
      Is the Bosch BMS500-AAS009-1CSXRC good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 8,000 BTU/h at 5°F with a COP of 2.17, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Bosch BMS500-AAS009-1CSXRC cost to run per year?
      At its rated efficiency it costs about $160-$457 a year in electricity in large U.S. cities, depending on climate and local rates - for example $201 in Phoenix and $385 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Bosch BMS500-AAS009-1CSXRC the same as the MDV MOX230-09HFN1-MW5W-L?
      Yes, as far as the certified ratings go. ENERGY STAR lists 4 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 Bosch BMS500-AAS009-1CSXRC?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated ones use BOSCH BMS500-AAU006-1AHWXC, BOSCH BMS500-AAU009-1AHWXC, BOSCH BMS500-AAU009-1AHCXB.
      What refrigerant does the Bosch BMS500-AAS009-1CSXRC use?
      It uses R-410A. R-410A is being phased down under the EPA AIM Act, and new systems are moving to R-454B and 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 $202/yrYou save $279/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 Bosch BMS500-AAS009-1CSXRC
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $202
      Current system, per year
      $480
      You save per year
      $279
      Payback
      12.6 years
      Net after 10 years
      -$715

      Cooling $120Heating $82Electricity used: 1,262 kWhSaved vs. a minimum-efficiency heat pump: $169

      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 April 27, 2026. How we use the data.