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      3.5-ton central heat pump · DZ6VS

      Daikin DZ6VSA421EA

      Average cooling and heating efficiency for a 3.5-ton central heat pump, and certified for cold climates.

      Ranks #33 of 138 3.5 ton central heat pumps for cooling efficiency, and costs about $1,232 a year to run in a mixed climate like Atlanta.

      SEER2
      17.0 Cooling efficiency over a season
      Average · beats 49%
      HSPF2
      8.6 Heating efficiency over a season
      Average · beats 45%
      EER2
      10.0 Cooling efficiency on a 95°F day
      Below average · beats 10%
      Heat at 5°F
      30,600 BTU/h77% of its 47°F output
      Very good · beats 76%

      A good fit if…

      • Your winters get properly cold - it is ENERGY STAR cold-climate certified, with 30,600 BTU/h at 5°F.
      • You want steady temperatures and quiet running - the compressor varies its speed.

      Think twice if…

      • You want the newest refrigerant - it uses R-410A, which is being phased down.

      Calculate my running cost

      Details

      Specifications3.5 ton, R-410A
      General
      BrandDaikin
      Also sold asAmana
      Outdoor unit modelDZ6VSA421EA
      SeriesDZ6VS
      TypeCentral heat pump
      Nominal size3.5 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-410A
      Connected (smart) capableNo
      On the market sinceMay 6, 2025
      Last certifiedAugust 19, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better17.0 (range 17.0)
      EER2Efficiency at 95°F outdoors10.0
      Cooling capacity40,000 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.6
      Capacity at 47°F40,000 BTU/h
      Capacity at 17°F27,800-28,000 BTU/h
      Capacity at 5°F30,600 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.20
      ENERGY STAR cold climateYes
      Heating output as it gets colder77% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with CA*EA6030*4A at the standard test temperatures, in BTU/h:

      Certified matchups4 indoor units

      The same outdoor unit scores differently with each indoor unit and furnace. Ask your installer for the AHRI reference number of the exact system you are quoted.

      Indoor unitFurnaceSEER2EER2HSPF2Heat @5°FAHRI ref.
      CA*EA6030*4A · cold climateD*80TC0805C*A*17.010.08.630,600217362038
      CA*EA6030*4A · cold climateD*80TC0805D*A*17.010.08.630,600217362036
      CA*EA6030*4A · cold climateD*80TC0804C*A*17.010.08.630,600217362046
      CA*EA6030*4A · cold climateD*80TC1005C*A*17.010.08.630,600217362047
      Same unit, other model numbers1

      These model numbers have exactly the same certified ratings and matchups as the Daikin DZ6VSA421EA: 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$1,105-$2,942

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

      Questions6
      What is the SEER2 rating of the Daikin DZ6VSA421EA?
      The Daikin DZ6VSA421EA is rated at up to 17.0 SEER2 and 10.0 EER2 for cooling and up to 8.6 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with.
      Is the Daikin DZ6VSA421EA good for cold climates?
      Yes. At least one certified matchup meets the ENERGY STAR cold-climate criteria, delivering up to 30,600 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 Daikin DZ6VSA421EA cost to run per year?
      At its rated efficiency it costs about $1,105-$2,942 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,361 in Phoenix and $2,456 in Minneapolis. The calculator on this page works it out for your city and compares it with your current system.
      Is the Daikin DZ6VSA421EA the same as the Amana ASZS60421EA?
      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 Daikin DZ6VSA421EA?
      ENERGY STAR lists 4 certified combinations for this outdoor unit. The highest-rated one uses CA*EA6030*4A.
      What refrigerant does the Daikin DZ6VSA421EA 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 $1,349/yrYou save $713/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 Daikin DZ6VSA421EA
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,349
      Current system, per year
      $2,063
      You save per year
      $713
      Payback
      21.0 years
      Net after 10 years
      -$7,867

      Cooling $828Heating $521Electricity used: 8,432 kWhSaved vs. a minimum-efficiency heat pump: $233

      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 August 19, 2026. How we use the data.