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      24,000 BTU mini-split heat pump · 1PAMS

      PerfectAire 1PAMSHH24-SZW-20.5

      Below average cooling efficiency and average heating efficiency for a 24,000 BTU mini-split heat pump, and certified for cold climates.

      Ranks #374 of 430 24,000 BTU mini-splits for cooling efficiency, and costs about $640 a year to run in a mixed climate like Atlanta.

      SEER2
      19.2 Cooling efficiency over a season
      Below average · beats 11%
      HSPF2
      10.5 Heating efficiency over a season
      Average · beats 61%
      EER2
      12.0 Cooling efficiency on a 95°F day
      Below average · beats 25%
      Heat at 5°F
      27,000 BTU/h108% of its 47°F output
      Average · beats 48%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 27,000 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.
      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications24,000 BTU, R-410A
      General
      BrandPerfectAire
      Also sold asKANIONco
      Outdoor unit model1PAMSHH24-SZW-20.5
      Series1PAMS
      TypeMini-split heat pump
      Nominal size24,000 BTU
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceJune 3, 2020
      Last certifiedApril 27, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.2 (range 19.2)
      EER2Efficiency at 95°F outdoors12.0
      Cooling capacity24,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better10.5
      Capacity at 47°F25,000 BTU/h
      Capacity at 17°F21,000 BTU/h
      Capacity at 5°F27,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00
      ENERGY STAR cold climateYes
      Heating output as it gets colder108% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with 2PAMSDH24 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.
      2PAMSDH24 PERFECTAIRE · cold climate19.212.010.527,000207192291
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the PerfectAire 1PAMSHH24-SZW-20.5: 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$587-$1,517

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

      Questions6
      What is the SEER2 rating of the PerfectAire 1PAMSHH24-SZW-20.5?
      The PerfectAire 1PAMSHH24-SZW-20.5 is rated at up to 19.2 SEER2 and 12.0 EER2 for cooling and up to 10.5 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the PerfectAire 1PAMSHH24-SZW-20.5 good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 27,000 BTU/h at 5°F with a COP of 2.00, so it is still 2.0 times as efficient as electric resistance heat at that temperature.
      How much does the PerfectAire 1PAMSHH24-SZW-20.5 cost to run per year?
      At its rated efficiency it costs about $587-$1,517 a year in electricity in large U.S. cities, depending on climate and local rates - for example $716 in Phoenix and $1,262 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the PerfectAire 1PAMSHH24-SZW-20.5 the same as the KANIONco KD-24IR410AHSODU?
      Yes, as far as the certified ratings go. ENERGY STAR lists both 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 PerfectAire 1PAMSHH24-SZW-20.5?
      ENERGY STAR lists 1 certified combination for this outdoor unit. The highest-rated one uses PERFECTAIRE 2PAMSDH24.
      What refrigerant does the PerfectAire 1PAMSHH24-SZW-20.5 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 $707/yrYou save $547/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 PerfectAire 1PAMSHH24-SZW-20.5
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $707
      Current system, per year
      $1,254
      You save per year
      $547
      Payback
      16.4 years
      Net after 10 years
      -$3,528

      Cooling $440Heating $267Electricity used: 4,417 kWhSaved vs. a minimum-efficiency heat pump: $257

      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.