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      42,000 BTU mini-split heat pump · RAV-BP421AT2P-UL

      TOSHIBA CARRIER RAV-BP421AT2P-UL

      Average cooling efficiency and very good heating efficiency for a 42,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #10 of 61 42,000 BTU mini-splits for cooling efficiency, and costs about $986 a year to run in a mixed climate like Atlanta.

      SEER2
      22.6 Cooling efficiency over a season
      Average · beats 57%
      HSPF2
      11.2 Heating efficiency over a season
      Very good · beats 79%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      33,400 BTU/h80% of its 47°F output
      Average · beats 67%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 33,400 BTU/h at 5°F.
      • It will heat most of the year - its HSPF2 beats 79% of mini-splits.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • Nothing stands out - its ratings have no weak spot for its class.

      Calculate my running cost

      Details

      Specifications42,000 BTU, R-454B
      General
      BrandTOSHIBA CARRIER
      Outdoor unit modelRAV-BP421AT2P-UL
      SeriesRAV-BP421AT2P-UL
      TypeMini-split heat pump
      Nominal size42,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceJanuary 30, 2025
      Last certifiedMarch 3, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better22.6 (range 22.6)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity42,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better11.2
      Capacity at 47°F42,000 BTU/h
      Capacity at 17°F30,600 BTU/h
      Capacity at 5°F33,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.10
      ENERGY STAR cold climateYes
      Heating output as it gets colder80% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with RAV-HB421UTP-UL 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.
      RAV-HB421UTP-UL · cold climate22.612.011.233,400216415467
      Yearly running cost in 10 large cities$874-$2,362

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

      Questions5
      What is the SEER2 rating of the TOSHIBA CARRIER RAV-BP421AT2P-UL?
      The TOSHIBA CARRIER RAV-BP421AT2P-UL is rated at up to 22.6 SEER2 and 12.0 EER2 for cooling and up to 11.2 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the TOSHIBA CARRIER RAV-BP421AT2P-UL good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 33,400 BTU/h at 5°F with a COP of 2.10, so it is still 2.1 times as efficient as electric resistance heat at that temperature.
      How much does the TOSHIBA CARRIER RAV-BP421AT2P-UL cost to run per year?
      At its rated efficiency it costs about $874-$2,362 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,081 in Phoenix and $1,976 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Which indoor units work with the TOSHIBA CARRIER RAV-BP421AT2P-UL?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses RAV-HB421UTP-UL.
      What refrigerant does the TOSHIBA CARRIER RAV-BP421AT2P-UL 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 $1,074/yrYou save $1,091/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 TOSHIBA CARRIER RAV-BP421AT2P-UL
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,074
      Current system, per year
      $2,166
      You save per year
      $1,091
      Payback
      14.7 years
      Net after 10 years
      -$5,085

      Cooling $654Heating $420Electricity used: 6,713 kWhSaved vs. a minimum-efficiency heat pump: $587

      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 3, 2025. How we use the data.