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      4-ton central heat pump · NAZ17V

      Navien, Inc. NAZ17V6022A1

      Average cooling and heating efficiency for a 4-ton central heat pump, but not rated for cold climates.

      Ranks #90 of 319 4 ton central heat pumps for cooling efficiency, and costs about $1,308 a year to run in a mixed climate like Atlanta.

      SEER2
      18.0 Cooling efficiency over a season
      Average · beats 66%
      HSPF2
      9.3 Heating efficiency over a season
      Average · beats 62%
      EER2
      11.4 Cooling efficiency on a 95°F day
      Below average · beats 30%
      Heat at 5°F
      36,400 BTU/h81% of its 47°F output
      Average · beats 58%

      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.

      Calculate my running cost

      Details

      Specifications4 ton, R-454B
      General
      BrandNavien, Inc.
      Outdoor unit modelNAZ17V6022A1
      SeriesNAZ17V
      TypeCentral heat pump
      Nominal size4 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceApril 1, 2025
      Last certifiedSeptember 16, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better18.0 (range 17.3-18.0)
      EER2Efficiency at 95°F outdoors11.1-11.4
      Cooling capacity44,000-46,500 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.6-9.3
      Capacity at 47°F44,000-45,000 BTU/h
      Capacity at 17°F42,500-44,000 BTU/h
      Capacity at 5°F35,400-36,400 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater2.00-2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder81% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with NASV48D2T2A1 at the standard test temperatures, in BTU/h:

      Certified matchups2 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.
      NASV48D2T2A118.011.49.336,400217047512
      NASS48D2T2A117.311.18.635,400217605211
      Yearly running cost in 10 large cities$1,212-$3,093

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

      Questions5
      What is the SEER2 rating of the Navien, Inc. NAZ17V6022A1?
      The Navien, Inc. NAZ17V6022A1 is rated at up to 18.0 SEER2 and 11.4 EER2 for cooling and up to 9.3 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 2 certified matchups SEER2 ranges from 17.3-18.0.
      Is the Navien, Inc. NAZ17V6022A1 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 4-ton model.
      How much does the Navien, Inc. NAZ17V6022A1 cost to run per year?
      At its rated efficiency it costs about $1,212-$3,093 a year in electricity in large U.S. cities, depending on climate and local rates - for example $1,473 in Phoenix and $2,568 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 Navien, Inc. NAZ17V6022A1?
      ENERGY STAR lists 2 certified combinations for this outdoor unit. The highest-rated ones use NASV48D2T2A1, NASS48D2T2A1.
      What refrigerant does the Navien, Inc. NAZ17V6022A1 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 $1,451/yrYou save $922/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 Navien, Inc. NAZ17V6022A1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $1,451
      Current system, per year
      $2,373
      You save per year
      $922
      Payback
      19.0 years
      Net after 10 years
      -$8,282

      Cooling $909Heating $542Electricity used: 9,070 kWhSaved vs. a minimum-efficiency heat pump: $365

      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 September 16, 2026. How we use the data.