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      12,000 BTU mini-split heat pump · Q series

      DELLA 048-MS-12K2VR-21S-OUT

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

      Ranks #334 of 394 12,000 BTU mini-splits for cooling efficiency, and costs about $316 a year to run in a mixed climate like Atlanta.

      SEER2
      21.0 Cooling efficiency over a season
      Below average · beats 30%
      HSPF2
      10.0 Heating efficiency over a season
      Average · beats 43%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      8,200 BTU/h67% of its 47°F output
      Very good · beats 73%

      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.

      Calculate my running cost

      Details

      Specifications12,000 BTU, R-32
      General
      BrandDELLA
      Also sold asCOSTWAY, Premium Levella, ALBOTT, AUX
      Outdoor unit model048-MS-12K2VR-21S-OUT
      SeriesQ series
      TypeMini-split heat pump
      Nominal size12,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-32
      Connected (smart) capableNo
      On the market sinceMarch 1, 2024
      Last certifiedMarch 20, 2025
      Cooling
      SEER2Seasonal efficiency, higher is better21.0 (range 21.0)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity12,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.0
      Capacity at 47°F12,300 BTU/h
      Capacity at 17°F6,700 BTU/h
      Capacity at 5°F8,200 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.15
      ENERGY STAR cold climateNo
      Heating output as it gets colder67% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 048-MS-12K2VR-21S-QC-IN 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.
      048-MS-12K2VR-21S-QC-IN21.012.010.08,200211001968
      Same unit, other model numbers5

      These model numbers have exactly the same certified ratings and matchups as the DELLA 048-MS-12K2VR-21S-OUT: 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$269-$766

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

      Questions6
      What is the SEER2 rating of the DELLA 048-MS-12K2VR-21S-OUT?
      The DELLA 048-MS-12K2VR-21S-OUT is rated at up to 21.0 SEER2 and 12.0 EER2 for cooling and up to 10.0 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the DELLA 048-MS-12K2VR-21S-OUT 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 DELLA 048-MS-12K2VR-21S-OUT cost to run per year?
      At its rated efficiency it costs about $269-$766 a year in electricity in large U.S. cities, depending on climate and local rates - for example $338 in Phoenix and $645 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the DELLA 048-MS-12K2VR-21S-OUT the same as the COSTWAY FP10412US-12WH?
      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 DELLA 048-MS-12K2VR-21S-OUT?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses 048-MS-12K2VR-21S-QC-IN.
      What refrigerant does the DELLA 048-MS-12K2VR-21S-OUT 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 $339/yrYou save $285/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 DELLA 048-MS-12K2VR-21S-OUT
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $339
      Current system, per year
      $624
      You save per year
      $285
      Payback
      15.8 years
      Net after 10 years
      -$1,652

      Cooling $201Heating $138Electricity used: 2,118 kWhSaved vs. a minimum-efficiency heat pump: $140

      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 20, 2025. How we use the data.