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      2-ton central heat pump · NAZ17V

      Navien, Inc. NAZ17V3622A1

      Excellent cooling efficiency and average heating efficiency for a 2-ton central heat pump, but not rated for cold climates.

      Ranks #44 of 331 2 ton central heat pumps for cooling efficiency, and costs about $689 a year to run in a mixed climate like Atlanta.

      SEER2
      19.5 Cooling efficiency over a season
      Excellent · beats 91%
      HSPF2
      8.8 Heating efficiency over a season
      Average · beats 48%
      EER2
      11.7 Cooling efficiency on a 95°F day
      Average · beats 43%
      Heat at 5°F
      25,000 BTU/h69% of its 47°F output
      Average · beats 58%

      A good fit if…

      • You want low cooling bills - its SEER2 beats 91% of central heat pumps.
      • You want steady temperatures and quiet running - the compressor varies its speed.
      • You want a choice of indoor units - 12 certified pairings.

      Think twice if…

      • You often see nights below 0°F - it is not cold-climate certified.

      Calculate my running cost

      Details

      Specifications2 ton, R-454B
      General
      BrandNavien, Inc.
      Outdoor unit modelNAZ17V3622A1
      SeriesNAZ17V
      TypeCentral heat pump
      Nominal size2 ton
      CompressorVariable-speed units run longer at low powerContinuously variable
      RefrigerantR-454B
      Connected (smart) capableNo
      On the market sinceApril 1, 2025
      Last certifiedSeptember 22, 2026
      Cooling
      SEER2Seasonal efficiency, higher is better19.5 (range 16.3-19.5)
      EER2Efficiency at 95°F outdoors11.1-12.4
      Cooling capacity22,000-34,400 BTU/h
      Heating
      HSPF2Seasonal efficiency, higher is better8.1-8.8
      Capacity at 47°F23,400-36,000 BTU/h
      Capacity at 17°F17,500-25,600 BTU/h
      Capacity at 5°F18,500-25,000 BTU/h
      COP at 5°F2.0 = twice as efficient as a space heater1.84-2.10
      ENERGY STAR cold climateNo
      Heating output as it gets colder69% kept at 5°F

      Every heat pump delivers less heat as the outdoor temperature drops. Certified output of its matchup with NASV36C2T2A1 at the standard test temperatures, in BTU/h:

      Certified matchups12 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.
      NASV36C2T2A1-19.511.78.825,000217047511
      NASV24B2T2A1-18.012.48.820,000217047510
      NAM24B2TA1NDF600-070M2V3B17.611.68.619,600218774964
      NASS24B2T2A1-17.012.08.818,500217605445
      NAM24B2TA1NPF700-080D3BH16.812.08.719,600218088735
      NAM24B2TA1NPF700-060D3BH16.812.08.719,600218088732
      NAM24B2TA1NDF600-050M2V3B16.711.68.119,600218774950
      NAM24B2TA1NPF700-060U3BH16.611.78.820,000217598480
      NAM24B2TA1NPF700-080U3BH16.611.78.820,000217598486
      NASS36C2T2A1-16.611.18.623,600217605446
      NAM24B2TA1NPF700-060H3BH16.311.48.820,000217598482
      NAM24B2TA1NPF700-080H3BH16.311.48.820,000217598484
      Yearly running cost in 10 large cities$548-$1,703

      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. NAZ17V3622A1?
      The Navien, Inc. NAZ17V3622A1 is rated at up to 19.5 SEER2 and 11.7 EER2 for cooling and up to 8.8 HSPF2 for heating. The exact figure depends on the indoor unit it is paired with; across its 12 certified matchups SEER2 ranges from 16.3-19.5.
      Is the Navien, Inc. NAZ17V3622A1 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 2-ton model.
      How much does the Navien, Inc. NAZ17V3622A1 cost to run per year?
      At its rated efficiency it costs about $548-$1,703 a year in electricity in large U.S. cities, depending on climate and local rates - for example $709 in Phoenix and $1,448 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. NAZ17V3622A1?
      ENERGY STAR lists 12 certified combinations for this outdoor unit. The highest-rated ones use NASV36C2T2A1, NASV24B2T2A1, NAM24B2TA1.
      What refrigerant does the Navien, Inc. NAZ17V3622A1 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 $720/yrYou save $474/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. NAZ17V3622A1
      3. What it replaces
      4. Price replace the example with your quote
      Heat pump, per year
      $720
      Current system, per year
      $1,195
      You save per year
      $474
      Payback
      17.9 years
      Net after 10 years
      -$3,755

      Cooling $408Heating $312Electricity used: 4,502 kWhSaved vs. a minimum-efficiency heat pump: $200

      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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      See all 331 2 ton central heat pumps, ranked

      Source: ENERGY STAR Certified Heat Pumps (U.S. EPA), certification of September 22, 2026. How we use the data.