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      12,000 BTU mini-split heat pump · BMS Series

      Bosch BMS500-AAS012-0CSXRD

      Average cooling efficiency and below average heating efficiency for a 12,000 BTU mini-split heat pump, but not rated for cold climates.

      Ranks #223 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $310 a year to run in a mixed climate like Atlanta.

      SEER2
      23.4 Cooling efficiency over a season
      Average · beats 68%
      HSPF2
      9.5 Heating efficiency over a season
      Below average · beats 24%
      EER2
      13.0 Cooling efficiency on a 95°F day
      Average · beats 62%
      Heat at 5°F
      7,700 BTU/h64% of its 47°F output
      Very good · beats 88%

      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.
      • You mainly need heat - its HSPF2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-454B
      General
      BrandBosch
      Also sold asBlueridge, Innovair, AC Pro, Kaden, ECO-AIR
      Outdoor unit modelBMS500-AAS012-0CSXRD
      SeriesBMS Series
      TypeMini-split heat pump
      Nominal size12,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceMarch 18, 2024
      Last certifiedMarch 4, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better23.4 (range 23.4)
      EER2Efficiency at 95°F outdoors13.0
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better9.5
      Capacity at 47°F12,000 BTU/h
      Capacity at 17°F8,700 BTU/h
      Capacity at 5°F7,700 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.33
      ENERGY STAR cold climateNo
      Heating output as it gets colder64% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with BMS500-AAS012-0AHWXD 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.
      BMS500-AAS012-0AHWXD BOSCH23.413.09.57,700215374898
      Same unit, other model numbers5

      These model numbers have exactly the same certified ratings and matchups as the Bosch BMS500-AAS012-0CSXRD: 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$243-$768

      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-AAS012-0CSXRD?
      The Bosch BMS500-AAS012-0CSXRD is rated at up to 23.4 SEER2 and 13.0 EER2 for cooling and up to 9.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Bosch BMS500-AAS012-0CSXRD 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 12,000 BTU model.
      How much does the Bosch BMS500-AAS012-0CSXRD cost to run per year?
      At its rated efficiency it costs about $243-$768 a year in electricity in large U.S. cities, depending on climate and local rates - for example $316 in Phoenix and $655 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Bosch BMS500-AAS012-0CSXRD the same as the Blueridge BMS1223XC?
      Yes, as far as the certified ratings go. ENERGY STAR lists 6 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-AAS012-0CSXRD?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses BOSCH BMS500-AAS012-0AHWXD.
      What refrigerant does the Bosch BMS500-AAS012-0CSXRD 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 $322/yrYou save $297/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-AAS012-0CSXRD
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $322
      Current system, per year
      $619
      You save per year
      $297
      Payback
      15.2 years
      Net after 10 years
      -$1,532

      Cooling $181Heating $141Electricity used: 2,012 kWhSaved vs. a minimum-efficiency heat pump: $153

      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 March 4, 2025. How we use the data.