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      36,000 BTU mini-split heat pump · BMS Series

      Bosch BMS500-AAS036-1CSXLD

      Below average cooling efficiency and average heating efficiency for a 36,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #142 of 205 36,000 BTU mini-splits for cooling efficiency, and costs about $964 a year to run in a mixed climate like Atlanta.

      SEER2
      20.0 Cooling efficiency over a season
      Below average · beats 18%
      HSPF2
      10.3 Heating efficiency over a season
      Average · beats 55%
      EER2
      9.6 Cooling efficiency on a 95°F day
      Below average · beats 4%
      Heat at 5°F
      26,600 BTU/h70% of its 47°F output
      Very good · beats 78%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 26,600 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Cooling cost matters most - its SEER2 is below average for mini-splits.

      Calculate my running cost

      Details

      Specifications36,000 BTU, R-454B
      General
      BrandBosch
      Also sold asMidea, Blueridge, Innovair, AC Pro, AI AIR CONDITIONING, ComfortStar, TRUST AIR CONDITIONERS, Mitsutomo, SLIMAIR, DIRECT AIR, CanAir, Elios, Multi MFG, ECO-AIR, Star Air Kontrol, Pioneer, TGM
      Outdoor unit modelBMS500-AAS036-1CSXLD
      SeriesBMS Series
      TypeMini-split heat pump
      Nominal size36,000 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 better20.0 (range 20.0)
      EER2Efficiency at 95°F outdoors9.6
      Cooling capacity36,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.3
      Capacity at 47°F38,000 BTU/h
      Capacity at 17°F26,800 BTU/h
      Capacity at 5°F26,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder70% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with BMS500-AAU036-1AHCXD 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-AAU036-1AHCXD BOSCH · cold climate20.09.610.326,600215223311
      Same unit, other model numbers19

      These model numbers have exactly the same certified ratings and matchups as the Bosch BMS500-AAS036-1CSXLD: 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$847-$2,317

      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-AAS036-1CSXLD?
      The Bosch BMS500-AAS036-1CSXLD is rated at up to 20.0 SEER2 and 9.6 EER2 for cooling and up to 10.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Bosch BMS500-AAS036-1CSXLD good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 26,600 BTU/h at 5°F with a COP of 2.20, so it is still 2.2 times as efficient as electric resistance heat at that temperature.
      How much does the Bosch BMS500-AAS036-1CSXLD cost to run per year?
      At its rated efficiency it costs about $847-$2,317 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,051 in Phoenix and $1,942 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Bosch BMS500-AAS036-1CSXLD the same as the Midea MO1BU-H36B-2A?
      Yes, as far as the certified ratings go. ENERGY STAR lists 20 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-AAS036-1CSXLD?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses BOSCH BMS500-AAU036-1AHCXD.
      What refrigerant does the Bosch BMS500-AAS036-1CSXLD 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 $1,047/yrYou save $842/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-AAS036-1CSXLD
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,047
      Current system, per year
      $1,889
      You save per year
      $842
      Payback
      16.0 years
      Net after 10 years
      -$5,078

      Cooling $634Heating $413Electricity used: 6,543 kWhSaved vs. a minimum-efficiency heat pump: $407

      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.

      Similar 36,000 BTU models

      See all 205 36,000 BTU mini-splits, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of March 4, 2025. How we use the data.